commit f9def5143208e65d5f14e8adf44c6b4f4998c15d
parent ff7601873acf80631a3e162fe13c3b6874e97cc2
Author: William Casarin <jb55@jb55.com>
Date: Sun, 22 Feb 2026 12:06:28 -0800
wasm: add notedeck_wasm crate with safe command buffer runtime
Add a WASM mini-app runtime for notedeck. WASM modules export
nd_update() and call host functions (nd_label, nd_heading, nd_button,
nd_add_space) to build UI. Host functions push commands to a buffer
which is rendered after nd_update() returns — zero unsafe code.
Buttons return click state from the previous frame (imperceptible
one-frame delay at 60fps). Button identity is by text content.
Includes:
- notedeck_wasm crate with wasmer 7 runtime
- Command buffer architecture (no raw pointers, no unsafe)
- App metadata via nd_app_name_ptr/len exports
- 11 tests using inline WAT modules
- build_hello_wasm example (667 byte hello world)
- Chrome integration behind wasm_apps feature flag
- Auto-loading from <data_dir>/cache/wasm_apps/
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Diffstat:
12 files changed, 1742 insertions(+), 105 deletions(-)
diff --git a/Cargo.lock b/Cargo.lock
@@ -34,7 +34,7 @@ version = "0.24.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dfbe277e56a376000877090da837660b4427aad530e3028d44e0bffe4f89a1c1"
dependencies = [
- "gimli",
+ "gimli 0.31.1",
]
[[package]]
@@ -55,7 +55,7 @@ version = "0.5.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
dependencies = [
- "crypto-common",
+ "crypto-common 0.1.6",
"generic-array",
]
@@ -159,7 +159,7 @@ dependencies = [
"jni 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)",
"keyring",
"ndk-context",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
"tracing",
]
@@ -192,9 +192,9 @@ checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
[[package]]
name = "arbitrary"
-version = "1.4.1"
+version = "1.4.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dde20b3d026af13f561bdd0f15edf01fc734f0dafcedbaf42bba506a9517f223"
+checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1"
dependencies = [
"derive_arbitrary",
]
@@ -386,7 +386,7 @@ dependencies = [
"secrecy",
"serde",
"serde_json",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
"tokio",
"tokio-stream",
"tokio-util",
@@ -610,7 +610,7 @@ dependencies = [
"cfg-if",
"libc",
"miniz_oxide",
- "object",
+ "object 0.36.7",
"rustc-demangle",
"windows-targets 0.52.6",
]
@@ -690,7 +690,7 @@ dependencies = [
"rustc-hash 1.1.0",
"shlex",
"syn 2.0.104",
- "which",
+ "which 4.4.2",
]
[[package]]
@@ -852,6 +852,15 @@ dependencies = [
]
[[package]]
+name = "block-buffer"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96eb4cdd6cf1b31d671e9efe75c5d1ec614776856cefbe109ca373554a6d514f"
+dependencies = [
+ "hybrid-array",
+]
+
+[[package]]
name = "block-padding"
version = "0.3.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -938,6 +947,32 @@ name = "bumpalo"
version = "3.19.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
+dependencies = [
+ "allocator-api2",
+]
+
+[[package]]
+name = "bytecheck"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0caa33a2c0edca0419d15ac723dff03f1956f7978329b1e3b5fdaaaed9d3ca8b"
+dependencies = [
+ "bytecheck_derive",
+ "ptr_meta",
+ "rancor",
+ "simdutf8",
+]
+
+[[package]]
+name = "bytecheck_derive"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89385e82b5d1821d2219e0b095efa2cc1f246cbf99080f3be46a1a85c0d392d9"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.104",
+]
[[package]]
name = "bytemuck"
@@ -1014,10 +1049,11 @@ dependencies = [
[[package]]
name = "cc"
-version = "1.2.27"
+version = "1.2.56"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d487aa071b5f64da6f19a3e848e3578944b726ee5a4854b82172f02aa876bfdc"
+checksum = "aebf35691d1bfb0ac386a69bac2fde4dd276fb618cf8bf4f5318fe285e821bb2"
dependencies = [
+ "find-msvc-tools",
"jobserver",
"libc",
"shlex",
@@ -1045,7 +1081,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d067ad48b8650848b989a59a86c6c36a995d02d2bf778d45c3c5d57bc2718f02"
dependencies = [
"smallvec",
- "target-lexicon",
+ "target-lexicon 0.12.16",
]
[[package]]
@@ -1120,7 +1156,7 @@ version = "0.4.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "773f3b9af64447d2ce9850330c473515014aa235e6a783b02db81ff39e4a3dad"
dependencies = [
- "crypto-common",
+ "crypto-common 0.1.6",
"inout",
"zeroize",
]
@@ -1152,7 +1188,7 @@ dependencies = [
"pin-project",
"serde",
"serde_json",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
"tokio",
"tracing",
"typed-builder",
@@ -1184,7 +1220,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
dependencies = [
"termcolor",
- "unicode-width",
+ "unicode-width 0.1.14",
]
[[package]]
@@ -1213,6 +1249,21 @@ dependencies = [
]
[[package]]
+name = "const-oid"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6ef517f0926dd24a1582492c791b6a4818a4d94e789a334894aa15b0d12f55c"
+
+[[package]]
+name = "convert_case"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "633458d4ef8c78b72454de2d54fd6ab2e60f9e02be22f3c6104cdc8a4e0fceb9"
+dependencies = [
+ "unicode-segmentation",
+]
+
+[[package]]
name = "core-foundation"
version = "0.9.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1272,6 +1323,19 @@ dependencies = [
]
[[package]]
+name = "corosensei"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b2b4c7e3e97730e6b0b8c5ff5ca82c663d1a645e4f630f4fa4c24e80626787e"
+dependencies = [
+ "autocfg",
+ "cfg-if",
+ "libc",
+ "scopeguard",
+ "windows-sys 0.59.0",
+]
+
+[[package]]
name = "cpufeatures"
version = "0.2.17"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1281,6 +1345,125 @@ dependencies = [
]
[[package]]
+name = "cranelift-assembler-x64"
+version = "0.128.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0377b13bf002a0774fcccac4f1102a10f04893d24060cf4b7350c87e4cbb647c"
+dependencies = [
+ "cranelift-assembler-x64-meta",
+]
+
+[[package]]
+name = "cranelift-assembler-x64-meta"
+version = "0.128.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfa027979140d023b25bf7509fb7ede3a54c3d3871fb5ead4673c4b633f671a2"
+dependencies = [
+ "cranelift-srcgen",
+]
+
+[[package]]
+name = "cranelift-bforest"
+version = "0.128.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aea7351476d0eb196e89150e7a6235ecd37c97848243faea7746c29676abeeac"
+dependencies = [
+ "cranelift-entity",
+]
+
+[[package]]
+name = "cranelift-bitset"
+version = "0.128.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db53764b5dad233b37b8f5dc54d3caa9900c54579195e00f17ea21f03f71aaa7"
+
+[[package]]
+name = "cranelift-codegen"
+version = "0.128.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa9e80ceb5153bb9dd0d048e685ec4df6fa20ce92d4ffffcb5d691623e1d8693"
+dependencies = [
+ "bumpalo",
+ "cranelift-assembler-x64",
+ "cranelift-bforest",
+ "cranelift-bitset",
+ "cranelift-codegen-meta",
+ "cranelift-codegen-shared",
+ "cranelift-control",
+ "cranelift-entity",
+ "cranelift-isle",
+ "gimli 0.32.3",
+ "hashbrown 0.15.4",
+ "log",
+ "regalloc2",
+ "rustc-hash 2.1.1",
+ "serde",
+ "smallvec",
+ "target-lexicon 0.13.5",
+ "wasmtime-internal-math",
+]
+
+[[package]]
+name = "cranelift-codegen-meta"
+version = "0.128.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3fcf1e3e6757834bd2584f4cbff023fcc198e9279dcb5d684b4bb27a9b19f54"
+dependencies = [
+ "cranelift-assembler-x64-meta",
+ "cranelift-codegen-shared",
+ "cranelift-srcgen",
+ "heck",
+]
+
+[[package]]
+name = "cranelift-codegen-shared"
+version = "0.128.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "205dcb9e6ccf9d368b7466be675ff6ee54a63e36da6fe20e72d45169cf6fd254"
+
+[[package]]
+name = "cranelift-control"
+version = "0.128.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "108eca9fcfe86026054f931eceaf57b722c1b97464bf8265323a9b5877238817"
+dependencies = [
+ "arbitrary",
+]
+
+[[package]]
+name = "cranelift-entity"
+version = "0.128.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e57c6f29da407f6ee9956197d011aedf4fd39bd03781ab5b44b85d45a448a27"
+dependencies = [
+ "cranelift-bitset",
+]
+
+[[package]]
+name = "cranelift-frontend"
+version = "0.128.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "add3991ccfeb20022443bae60b8adc56081f27caab0213b0ff26288954e44fe5"
+dependencies = [
+ "cranelift-codegen",
+ "log",
+ "smallvec",
+ "target-lexicon 0.13.5",
+]
+
+[[package]]
+name = "cranelift-isle"
+version = "0.128.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc02707039d43c0e132526f1d3ac319b45468331b823a1749625825010f644e4"
+
+[[package]]
+name = "cranelift-srcgen"
+version = "0.128.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4e378a54e7168a689486d67ee1f818b7e5356e54ae51a1d7a53f4f13f7f8b7a"
+
+[[package]]
name = "crc32fast"
version = "1.4.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1363,6 +1546,15 @@ dependencies = [
]
[[package]]
+name = "crypto-common"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "211f05e03c7d03754740fd9e585de910a095d6b99f8bcfffdef8319fa02a8331"
+dependencies = [
+ "hybrid-array",
+]
+
+[[package]]
name = "cursor-icon"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1374,8 +1566,18 @@ version = "0.20.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fc7f46116c46ff9ab3eb1597a45688b6715c6e628b5c133e288e709a29bcb4ee"
dependencies = [
- "darling_core",
- "darling_macro",
+ "darling_core 0.20.11",
+ "darling_macro 0.20.11",
+]
+
+[[package]]
+name = "darling"
+version = "0.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9cdf337090841a411e2a7f3deb9187445851f91b309c0c0a29e05f74a00a48c0"
+dependencies = [
+ "darling_core 0.21.3",
+ "darling_macro 0.21.3",
]
[[package]]
@@ -1393,12 +1595,36 @@ dependencies = [
]
[[package]]
+name = "darling_core"
+version = "0.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1247195ecd7e3c85f83c8d2a366e4210d588e802133e1e355180a9870b517ea4"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.104",
+]
+
+[[package]]
name = "darling_macro"
version = "0.20.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fc34b93ccb385b40dc71c6fceac4b2ad23662c7eeb248cf10d529b7e055b6ead"
dependencies = [
- "darling_core",
+ "darling_core 0.20.11",
+ "quote",
+ "syn 2.0.104",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d38308df82d1080de0afee5d069fa14b0326a88c14f15c5ccda35b4a6c414c81"
+dependencies = [
+ "darling_core 0.21.3",
"quote",
"syn 2.0.104",
]
@@ -1493,7 +1719,7 @@ version = "0.20.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2d5bcf7b024d6835cfb3d473887cd966994907effbe9227e8c8219824d06c4e8"
dependencies = [
- "darling",
+ "darling 0.20.11",
"proc-macro2",
"quote",
"syn 2.0.104",
@@ -1510,6 +1736,29 @@ dependencies = [
]
[[package]]
+name = "derive_more"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d751e9e49156b02b44f9c1815bcb94b984cdcc4396ecc32521c739452808b134"
+dependencies = [
+ "derive_more-impl",
+]
+
+[[package]]
+name = "derive_more-impl"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "799a97264921d8623a957f6c3b9011f3b5492f557bbb7a5a19b7fa6d06ba8dcb"
+dependencies = [
+ "convert_case",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "syn 2.0.104",
+ "unicode-xid",
+]
+
+[[package]]
name = "diff"
version = "0.1.13"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1521,12 +1770,23 @@ version = "0.10.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
dependencies = [
- "block-buffer",
- "crypto-common",
+ "block-buffer 0.10.4",
+ "crypto-common 0.1.6",
"subtle",
]
[[package]]
+name = "digest"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8bf3682cdec91817be507e4aa104314898b95b84d74f3d43882210101a545b6"
+dependencies = [
+ "block-buffer 0.11.0",
+ "const-oid",
+ "crypto-common 0.2.0",
+]
+
+[[package]]
name = "dirs"
version = "5.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1863,8 +2123,8 @@ dependencies = [
"serde",
"serde_derive",
"serde_json",
- "sha2",
- "thiserror 2.0.12",
+ "sha2 0.10.9",
+ "thiserror 2.0.18",
"tokenator",
"tokio",
"tracing",
@@ -1872,6 +2132,26 @@ dependencies = [
]
[[package]]
+name = "enum-iterator"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4549325971814bda7a44061bf3fe7e487d447cba01e4220a4b454d630d7a016"
+dependencies = [
+ "enum-iterator-derive",
+]
+
+[[package]]
+name = "enum-iterator-derive"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "685adfa4d6f3d765a26bc5dbc936577de9abf756c1feeb3089b01dd395034842"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.104",
+]
+
+[[package]]
name = "enum-map"
version = "2.7.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1925,6 +2205,27 @@ dependencies = [
]
[[package]]
+name = "enumset"
+version = "1.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25b07a8dfbbbfc0064c0a6bdf9edcf966de6b1c33ce344bdeca3b41615452634"
+dependencies = [
+ "enumset_derive",
+]
+
+[[package]]
+name = "enumset_derive"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f43e744e4ea338060faee68ed933e46e722fb7f3617e722a5772d7e856d8b3ce"
+dependencies = [
+ "darling 0.21.3",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.104",
+]
+
+[[package]]
name = "env_filter"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1934,6 +2235,12 @@ dependencies = [
]
[[package]]
+name = "env_home"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7f84e12ccf0a7ddc17a6c41c93326024c42920d7ee630d04950e6926645c0fe"
+
+[[package]]
name = "epaint"
version = "0.31.1"
source = "git+https://github.com/damus-io/egui?rev=e05638c40ef734312b3b3e36397d389d0a78b10b#e05638c40ef734312b3b3e36397d389d0a78b10b"
@@ -2061,6 +2368,12 @@ dependencies = [
]
[[package]]
+name = "fallible-iterator"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2acce4a10f12dc2fb14a218589d4f1f62ef011b2d0cc4b3cb1bba8e94da14649"
+
+[[package]]
name = "fastrand"
version = "2.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2091,6 +2404,12 @@ dependencies = [
]
[[package]]
+name = "find-msvc-tools"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
+
+[[package]]
name = "flatbuffers"
version = "23.5.26"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2179,7 +2498,7 @@ dependencies = [
"fluent-fallback",
"futures",
"rustc-hash 2.1.1",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
"unic-langid",
]
@@ -2190,7 +2509,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "54f0d287c53ffd184d04d8677f590f4ac5379785529e5e08b1c8083acdd5c198"
dependencies = [
"memchr",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
]
[[package]]
@@ -2476,6 +2795,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "07e28edb80900c19c28f1072f2e8aeca7fa06b23cd4169cefe1af5aa3260783f"
[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
dependencies = [
- "digest",
+ "digest 0.10.7",
]
[[package]]
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checksum = "5c3b1f728c459d27b12448862017b96ad4767b1ec2ec5e6434e99f1577f085b8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -3304,7 +3643,7 @@ dependencies = [
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checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "libc"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "libdbus-sys"
@@ -3494,6 +3845,12 @@ dependencies = [
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[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -3522,6 +3879,12 @@ dependencies = [
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[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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]
@@ -3810,6 +4208,32 @@ dependencies = [
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source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "thiserror 2.0.18",
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@@ -4032,7 +4456,7 @@ dependencies = [
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"libc",
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"tokio",
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@@ -4124,6 +4548,7 @@ dependencies = [
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"serde_json",
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+ "sha2 0.10.9",
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"tokio",
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source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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+ "digest 0.10.7",
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dependencies = [
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@@ -6297,6 +6911,16 @@ dependencies = [
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[[package]]
+name = "shared-buffer"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6c99835bad52957e7aa241d3975ed17c1e5f8c92026377d117a606f36b84b16"
+dependencies = [
+ "bytes",
+ "memmap2 0.6.2",
+]
+
+[[package]]
name = "shlex"
version = "1.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -6327,6 +6951,12 @@ dependencies = [
]
[[package]]
+name = "simdutf8"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3a9fe34e3e7a50316060351f37187a3f546bce95496156754b601a5fa71b76e"
+
+[[package]]
name = "similar"
version = "2.7.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -6386,7 +7016,7 @@ dependencies = [
"cursor-icon",
"libc",
"log",
- "memmap2",
+ "memmap2 0.9.10",
"rustix 0.38.44",
"thiserror 1.0.69",
"wayland-backend",
@@ -6609,6 +7239,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1"
[[package]]
+name = "target-lexicon"
+version = "0.13.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb6935a6f5c20170eeceb1a3835a49e12e19d792f6dd344ccc76a985ca5a6ca"
+
+[[package]]
name = "tempfile"
version = "3.20.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -6641,11 +7277,11 @@ dependencies = [
[[package]]
name = "thiserror"
-version = "2.0.12"
+version = "2.0.18"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "567b8a2dae586314f7be2a752ec7474332959c6460e02bde30d702a66d488708"
+checksum = "4288b5bcbc7920c07a1149a35cf9590a2aa808e0bc1eafaade0b80947865fbc4"
dependencies = [
- "thiserror-impl 2.0.12",
+ "thiserror-impl 2.0.18",
]
[[package]]
@@ -6661,9 +7297,9 @@ dependencies = [
[[package]]
name = "thiserror-impl"
-version = "2.0.12"
+version = "2.0.18"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f7cf42b4507d8ea322120659672cf1b9dbb93f8f2d4ecfd6e51350ff5b17a1d"
+checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
dependencies = [
"proc-macro2",
"quote",
@@ -7101,11 +7737,17 @@ dependencies = [
"rustls",
"rustls-pki-types",
"sha1",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
"utf-8",
]
[[package]]
+name = "twox-hash"
+version = "2.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ea3136b675547379c4bd395ca6b938e5ad3c3d20fad76e7fe85f9e0d011419c"
+
+[[package]]
name = "type-map"
version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -7228,6 +7870,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
[[package]]
+name = "unicode-width"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4ac048d71ede7ee76d585517add45da530660ef4390e49b098733c6e897f254"
+
+[[package]]
name = "unicode-xid"
version = "0.2.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -7239,7 +7887,7 @@ version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
dependencies = [
- "crypto-common",
+ "crypto-common 0.1.6",
"subtle",
]
@@ -7522,6 +8170,16 @@ dependencies = [
]
[[package]]
+name = "wasm-encoder"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "990065f2fe63003fe337b932cfb5e3b80e0b4d0f5ff650e6985b1048f62c8319"
+dependencies = [
+ "leb128fmt",
+ "wasmparser",
+]
+
+[[package]]
name = "wasm-streams"
version = "0.4.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -7535,6 +8193,199 @@ dependencies = [
]
[[package]]
+name = "wasmer"
+version = "7.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b76134972161fb9ae6d956d3e79177a51c6c968d4f95fdba060a95897b2fe81c"
+dependencies = [
+ "bindgen 0.72.1",
+ "bytes",
+ "cfg-if",
+ "cmake",
+ "derive_more",
+ "indexmap 2.9.0",
+ "js-sys",
+ "more-asserts",
+ "paste",
+ "rustc-demangle",
+ "serde",
+ "serde-wasm-bindgen",
+ "shared-buffer",
+ "tar",
+ "target-lexicon 0.13.5",
+ "thiserror 2.0.18",
+ "tracing",
+ "wasm-bindgen",
+ "wasmer-compiler",
+ "wasmer-compiler-cranelift",
+ "wasmer-derive",
+ "wasmer-types",
+ "wasmer-vm",
+ "wasmparser",
+ "wat",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "wasmer-compiler"
+version = "7.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c21c166e89212d5bc31d08dffdb189fe689f4ca58756ccd924f9fc3ec2ee89da"
+dependencies = [
+ "backtrace",
+ "bytes",
+ "cfg-if",
+ "enum-iterator",
+ "enumset",
+ "itertools 0.14.0",
+ "leb128",
+ "libc",
+ "macho-unwind-info",
+ "memmap2 0.9.10",
+ "more-asserts",
+ "object 0.38.1",
+ "rangemap",
+ "region",
+ "rkyv",
+ "self_cell",
+ "shared-buffer",
+ "smallvec",
+ "target-lexicon 0.13.5",
+ "tempfile",
+ "thiserror 2.0.18",
+ "wasmer-types",
+ "wasmer-vm",
+ "wasmparser",
+ "which 8.0.0",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "wasmer-compiler-cranelift"
+version = "7.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a3174d3c78dd581d590860195420305581e2708cb1082ce8bea05cf6ed0e432"
+dependencies = [
+ "cranelift-codegen",
+ "cranelift-entity",
+ "cranelift-frontend",
+ "gimli 0.32.3",
+ "indexmap 2.9.0",
+ "itertools 0.14.0",
+ "leb128",
+ "more-asserts",
+ "rayon",
+ "smallvec",
+ "target-lexicon 0.13.5",
+ "tracing",
+ "wasmer-compiler",
+ "wasmer-types",
+]
+
+[[package]]
+name = "wasmer-derive"
+version = "7.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20424fca4c6a757d7115a39ad5c6a5d369f5f864a5c64263d6de14b40f060cc8"
+dependencies = [
+ "proc-macro-error2",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.104",
+]
+
+[[package]]
+name = "wasmer-types"
+version = "7.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a7f91b0cb63705afa0843b46a0aeaeaedff7be2e5b05691176e9e58e2dbe921"
+dependencies = [
+ "bytecheck",
+ "enum-iterator",
+ "enumset",
+ "getrandom 0.2.16",
+ "hex",
+ "indexmap 2.9.0",
+ "more-asserts",
+ "rkyv",
+ "sha2 0.11.0-rc.5",
+ "target-lexicon 0.13.5",
+ "thiserror 2.0.18",
+]
+
+[[package]]
+name = "wasmer-vm"
+version = "7.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12da92bb2c2abd09628d28d112970880a9e671b7ccb55172e5f6db01b5d6add4"
+dependencies = [
+ "backtrace",
+ "cc",
+ "cfg-if",
+ "corosensei",
+ "crossbeam-queue",
+ "dashmap",
+ "enum-iterator",
+ "fnv",
+ "gimli 0.32.3",
+ "indexmap 2.9.0",
+ "libc",
+ "libunwind",
+ "mach2 0.6.0",
+ "memoffset",
+ "more-asserts",
+ "parking_lot",
+ "region",
+ "rustversion",
+ "scopeguard",
+ "thiserror 2.0.18",
+ "wasmer-types",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "wasmparser"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
+dependencies = [
+ "bitflags 2.9.1",
+ "indexmap 2.9.0",
+ "semver",
+]
+
+[[package]]
+name = "wasmtime-internal-math"
+version = "41.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d61fe7cfca53d0ce01dc480ce1db93ad48b6fa1f354d8ff0680ac6a76ef354a3"
+dependencies = [
+ "libm",
+]
+
+[[package]]
+name = "wast"
+version = "244.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2e7b9f9e23311275920e3d6b56d64137c160cf8af4f84a7283b36cfecbf4acb"
+dependencies = [
+ "bumpalo",
+ "leb128fmt",
+ "memchr",
+ "unicode-width 0.2.2",
+ "wasm-encoder",
+]
+
+[[package]]
+name = "wat"
+version = "1.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbf35b87ed352f9ab6cd0732abde5a67dd6153dfd02c493e61459218b19456fa"
+dependencies = [
+ "wast",
+]
+
+[[package]]
name = "wayland-backend"
version = "0.3.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -7759,7 +8610,7 @@ dependencies = [
"raw-window-handle",
"rustc-hash 1.1.0",
"smallvec",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
"wgpu-hal",
"wgpu-types",
]
@@ -7802,7 +8653,7 @@ dependencies = [
"renderdoc-sys",
"rustc-hash 1.1.0",
"smallvec",
- "thiserror 2.0.12",
+ "thiserror 2.0.18",
"wasm-bindgen",
"web-sys",
"wgpu-types",
@@ -7835,6 +8686,17 @@ dependencies = [
]
[[package]]
+name = "which"
+version = "8.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3fabb953106c3c8eea8306e4393700d7657561cb43122571b172bbfb7c7ba1d"
+dependencies = [
+ "env_home",
+ "rustix 1.0.7",
+ "winsafe",
+]
+
+[[package]]
name = "winapi"
version = "0.3.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -8410,7 +9272,7 @@ dependencies = [
"dpi 0.1.1",
"js-sys",
"libc",
- "memmap2",
+ "memmap2 0.9.10",
"ndk",
"objc2 0.5.2",
"objc2-app-kit 0.2.2",
@@ -8462,7 +9324,7 @@ dependencies = [
"dpi 0.1.2",
"js-sys",
"libc",
- "memmap2",
+ "memmap2 0.9.10",
"ndk",
"objc2 0.5.2",
"objc2-app-kit 0.2.2",
@@ -8503,6 +9365,12 @@ dependencies = [
]
[[package]]
+name = "winsafe"
+version = "0.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d135d17ab770252ad95e9a872d365cf3090e3be864a34ab46f48555993efc904"
+
+[[package]]
name = "wit-bindgen-rt"
version = "0.39.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
@@ -16,6 +16,7 @@ members = [
"crates/tokenator",
"crates/enostr",
"crates/protoverse",
+ "crates/notedeck_wasm",
]
[workspace.dependencies]
@@ -79,6 +80,7 @@ notedeck_notebook = { path = "crates/notedeck_notebook" }
notedeck_nostrverse = { path = "crates/notedeck_nostrverse" }
renderbud = { path = "../github/jb55/renderbud", features = ["egui"] }
notedeck_ui = { path = "crates/notedeck_ui" }
+notedeck_wasm = { path = "crates/notedeck_wasm" }
tokenator = { path = "crates/tokenator" }
md-stream = { path = "crates/md-stream" }
once_cell = "1.19.0"
diff --git a/crates/notedeck_chrome/Cargo.toml b/crates/notedeck_chrome/Cargo.toml
@@ -23,6 +23,7 @@ notedeck_notebook = { workspace = true, optional = true }
notedeck_nostrverse = { workspace = true, optional = true }
notedeck_clndash = { workspace = true, optional = true }
notedeck_dashboard = { workspace = true, optional = true }
+notedeck_wasm = { workspace = true, optional = true }
notedeck = { workspace = true }
nostrdb = { workspace = true }
puffin = { workspace = true, optional = true }
@@ -61,6 +62,7 @@ notebook = ["notedeck_notebook"]
nostrverse = ["notedeck_nostrverse"]
clndash = ["notedeck_clndash"]
dashboard = ["notedeck_dashboard"]
+wasm_apps = ["notedeck_wasm"]
[target.'cfg(target_os = "android")'.dependencies]
tracing-logcat = "0.1.0"
diff --git a/crates/notedeck_chrome/src/app.rs b/crates/notedeck_chrome/src/app.rs
@@ -37,7 +37,7 @@ pub enum NotedeckApp {
#[cfg(feature = "nostrverse")]
Nostrverse(Box<NostrverseApp>),
- Other(Box<dyn notedeck::App>),
+ Other(String, Box<dyn notedeck::App>),
}
impl notedeck::App for NotedeckApp {
@@ -62,7 +62,7 @@ impl notedeck::App for NotedeckApp {
#[cfg(feature = "nostrverse")]
NotedeckApp::Nostrverse(nostrverse) => nostrverse.update(ctx, ui),
- NotedeckApp::Other(other) => other.update(ctx, ui),
+ NotedeckApp::Other(_name, other) => other.update(ctx, ui),
}
}
}
diff --git a/crates/notedeck_chrome/src/chrome.rs b/crates/notedeck_chrome/src/chrome.rs
@@ -161,6 +161,11 @@ impl Chrome {
cc.egui_ctx.clone(),
context.path,
);
+ #[cfg(feature = "wasm_apps")]
+ let wasm_dir = context
+ .path
+ .path(notedeck::DataPathType::Cache)
+ .join("wasm_apps");
let mut chrome = Chrome::default();
if !app_args.iter().any(|arg| arg == "--no-columns-app") {
@@ -188,6 +193,39 @@ impl Chrome {
notedeck_nostrverse::NostrverseApp::demo(cc.wgpu_render_state.as_ref()),
)));
+ #[cfg(feature = "wasm_apps")]
+ {
+ tracing::info!("looking for WASM apps in: {}", wasm_dir.display());
+ if wasm_dir.is_dir() {
+ if let Ok(entries) = std::fs::read_dir(&wasm_dir) {
+ for entry in entries.flatten() {
+ let path = entry.path();
+ if path.extension().is_some_and(|e| e == "wasm") {
+ match notedeck_wasm::WasmApp::from_file(&path) {
+ Ok(app) => {
+ let name = app.name().to_string();
+ tracing::info!(
+ "loaded WASM app '{}': {}",
+ name,
+ path.display()
+ );
+ chrome.add_app(NotedeckApp::Other(name, Box::new(app)));
+ }
+ Err(e) => {
+ tracing::error!(
+ "failed to load WASM app {}: {e}",
+ path.display()
+ );
+ }
+ }
+ }
+ }
+ }
+ } else {
+ tracing::info!("WASM apps directory not found: {}", wasm_dir.display());
+ }
+ }
+
chrome.set_active(0);
Ok(chrome)
@@ -851,7 +889,9 @@ fn topdown_sidebar(
tr!(loc, "Nostrverse", "Button to go to the Nostrverse app")
}
- NotedeckApp::Other(_) => tr!(loc, "Other", "Button to go to the Other app"),
+ NotedeckApp::Other(name, _) => {
+ tr!(loc, name.as_str(), "Button to go to a WASM app")
+ }
};
StripBuilder::new(ui)
@@ -861,52 +901,49 @@ fn topdown_sidebar(
strip.strip(|b| {
let resp = drawer_item(
b,
- |ui| {
- match app {
- NotedeckApp::Columns(_columns_app) => {
- ui.add(app_images::columns_image());
- }
+ |ui| match app {
+ NotedeckApp::Columns(_columns_app) => {
+ ui.add(app_images::columns_image());
+ }
- NotedeckApp::Dave(dave) => {
- dave_button(
- dave.avatar_mut(),
- ui,
- Rect::from_center_size(
- ui.available_rect_before_wrap().center(),
- vec2(30.0, 30.0),
- ),
- );
- }
+ NotedeckApp::Dave(dave) => {
+ dave_button(
+ dave.avatar_mut(),
+ ui,
+ Rect::from_center_size(
+ ui.available_rect_before_wrap().center(),
+ vec2(30.0, 30.0),
+ ),
+ );
+ }
- #[cfg(feature = "dashboard")]
- NotedeckApp::Dashboard(_columns_app) => {
- ui.add(app_images::algo_image());
- }
+ #[cfg(feature = "dashboard")]
+ NotedeckApp::Dashboard(_columns_app) => {
+ ui.add(app_images::algo_image());
+ }
- #[cfg(feature = "messages")]
- NotedeckApp::Messages(_dms) => {
- ui.add(app_images::new_message_image());
- }
+ #[cfg(feature = "messages")]
+ NotedeckApp::Messages(_dms) => {
+ ui.add(app_images::new_message_image());
+ }
- #[cfg(feature = "clndash")]
- NotedeckApp::ClnDash(_clndash) => {
- clndash_button(ui);
- }
+ #[cfg(feature = "clndash")]
+ NotedeckApp::ClnDash(_clndash) => {
+ clndash_button(ui);
+ }
- #[cfg(feature = "notebook")]
- NotedeckApp::Notebook(_notebook) => {
- notebook_button(ui);
- }
+ #[cfg(feature = "notebook")]
+ NotedeckApp::Notebook(_notebook) => {
+ notebook_button(ui);
+ }
- #[cfg(feature = "nostrverse")]
- NotedeckApp::Nostrverse(_nostrverse) => {
- ui.add(app_images::universe_image());
- }
+ #[cfg(feature = "nostrverse")]
+ NotedeckApp::Nostrverse(_nostrverse) => {
+ ui.add(app_images::universe_image());
+ }
- NotedeckApp::Other(_other) => {
- // app provides its own button rendering ui?
- panic!("TODO: implement other apps")
- }
+ NotedeckApp::Other(_name, _other) => {
+ ui.label("W");
}
},
text,
diff --git a/crates/notedeck_wasm/Cargo.toml b/crates/notedeck_wasm/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "notedeck_wasm"
+version = { workspace = true }
+edition = "2021"
+license = "GPLv3"
+description = "WASM mini-app runtime for Notedeck"
+
+[dependencies]
+wasmer = "7"
+notedeck = { workspace = true }
+egui = { workspace = true }
+tracing = { workspace = true }
+
+[dev-dependencies]
+wat = "1"
+dirs = { workspace = true }
diff --git a/crates/notedeck_wasm/api/notedeck_api.h b/crates/notedeck_wasm/api/notedeck_api.h
@@ -0,0 +1,27 @@
+#ifndef NOTEDECK_API_H
+#define NOTEDECK_API_H
+
+/*
+ * Notedeck WASM API — Stable Interface
+ *
+ * Stability guarantees:
+ * - Function signatures will never change once published
+ * - New functions may be added; existing ones will not be removed
+ * - All parameters are i32, f32, or (const char *, int) byte buffers
+ * - Extended versions use the _ex suffix if needed
+ *
+ * WASM module requirements:
+ * - Must export: void nd_update(void)
+ * - Must export: memory (1+ pages)
+ * - Optional exports: nd_app_name_ptr (i32), nd_app_name_len (i32)
+ */
+
+/* Text & widgets */
+void nd_label(const char *text, int len);
+void nd_heading(const char *text, int len);
+int nd_button(const char *text, int len); /* returns 1 if clicked (prev frame) */
+
+/* Layout */
+void nd_add_space(float pixels);
+
+#endif /* NOTEDECK_API_H */
diff --git a/crates/notedeck_wasm/examples/build_hello_wasm.rs b/crates/notedeck_wasm/examples/build_hello_wasm.rs
@@ -0,0 +1,134 @@
+/// Compiles the hello WAT module to a .wasm file and places it in
+/// the notedeck wasm_apps directory for testing.
+///
+/// Usage: cargo run -p notedeck_wasm --example build_hello_wasm
+fn main() {
+ let wat = r#"(module
+ (import "env" "nd_heading" (func $nd_heading (param i32 i32)))
+ (import "env" "nd_label" (func $nd_label (param i32 i32)))
+ (import "env" "nd_button" (func $nd_button (param i32 i32) (result i32)))
+ (import "env" "nd_add_space" (func $nd_add_space (param f32)))
+
+ (memory (export "memory") 1)
+
+ ;; Static strings
+ (data (i32.const 0) "Hello from WASM!") ;; 16 bytes
+ (data (i32.const 16) "Click me") ;; 8 bytes
+ (data (i32.const 24) "Clicks: ") ;; 8 bytes
+ (data (i32.const 32) "0123456789") ;; digit table
+
+ ;; App metadata
+ (data (i32.const 500) "Hello WASM")
+ (global (export "nd_app_name_ptr") i32 (i32.const 500))
+ (global (export "nd_app_name_len") i32 (i32.const 10))
+
+ ;; Global click counter
+ (global $count (mut i32) (i32.const 0))
+
+ ;; Simple itoa: writes decimal digits at ptr, returns length
+ (func $itoa (param $n i32) (param $ptr i32) (result i32)
+ (local $len i32)
+ (local $tmp i32)
+ (local $start i32)
+ (local $end i32)
+ (local $swap i32)
+
+ ;; Handle zero
+ (if (i32.eqz (local.get $n))
+ (then
+ (i32.store8 (local.get $ptr) (i32.const 48)) ;; '0'
+ (return (i32.const 1))
+ )
+ )
+
+ ;; Write digits in reverse
+ (local.set $tmp (local.get $n))
+ (local.set $len (i32.const 0))
+ (block $done
+ (loop $digits
+ (br_if $done (i32.eqz (local.get $tmp)))
+ (i32.store8
+ (i32.add (local.get $ptr) (local.get $len))
+ (i32.add (i32.const 48)
+ (i32.rem_u (local.get $tmp) (i32.const 10))))
+ (local.set $tmp (i32.div_u (local.get $tmp) (i32.const 10)))
+ (local.set $len (i32.add (local.get $len) (i32.const 1)))
+ (br $digits)
+ )
+ )
+
+ ;; Reverse the digits in place
+ (local.set $start (i32.const 0))
+ (local.set $end (i32.sub (local.get $len) (i32.const 1)))
+ (block $rev_done
+ (loop $rev
+ (br_if $rev_done (i32.ge_u (local.get $start) (local.get $end)))
+ ;; swap
+ (local.set $swap
+ (i32.load8_u (i32.add (local.get $ptr) (local.get $start))))
+ (i32.store8
+ (i32.add (local.get $ptr) (local.get $start))
+ (i32.load8_u (i32.add (local.get $ptr) (local.get $end))))
+ (i32.store8
+ (i32.add (local.get $ptr) (local.get $end))
+ (local.get $swap))
+ (local.set $start (i32.add (local.get $start) (i32.const 1)))
+ (local.set $end (i32.sub (local.get $end) (i32.const 1)))
+ (br $rev)
+ )
+ )
+
+ (local.get $len)
+ )
+
+ (func (export "nd_update")
+ (local $num_len i32)
+
+ ;; Heading
+ (call $nd_heading (i32.const 0) (i32.const 16))
+ (call $nd_add_space (f32.const 8.0))
+
+ ;; Button
+ (if (call $nd_button (i32.const 16) (i32.const 8))
+ (then
+ (global.set $count
+ (i32.add (global.get $count) (i32.const 1)))
+ )
+ )
+ (call $nd_add_space (f32.const 4.0))
+
+ ;; "Clicks: " prefix is at offset 24 (8 bytes)
+ ;; Write the number starting at offset 100 (scratch space)
+ (local.set $num_len
+ (call $itoa (global.get $count) (i32.const 100)))
+
+ ;; Copy "Clicks: " to offset 200, then append the number
+ ;; offset 200: "Clicks: "
+ (memory.copy (i32.const 200) (i32.const 24) (i32.const 8))
+ ;; offset 208: number digits
+ (memory.copy
+ (i32.const 208)
+ (i32.const 100)
+ (local.get $num_len))
+
+ ;; Label with total length = 8 + num_len
+ (call $nd_label
+ (i32.const 200)
+ (i32.add (i32.const 8) (local.get $num_len)))
+ )
+ )"#;
+
+ let wasm = wat::parse_str(wat).expect("failed to parse WAT");
+
+ // Write to the notedeck wasm_apps directory
+ let dir = dirs::data_dir()
+ .expect("data dir")
+ .join("notedeck")
+ .join("cache")
+ .join("wasm_apps");
+ std::fs::create_dir_all(&dir).expect("create wasm_apps dir");
+
+ let path = dir.join("hello.wasm");
+ std::fs::write(&path, &wasm).expect("write hello.wasm");
+ println!("Wrote {} bytes to {}", wasm.len(), path.display());
+}
diff --git a/crates/notedeck_wasm/examples/hello.c b/crates/notedeck_wasm/examples/hello.c
@@ -0,0 +1,53 @@
+/*
+ * Minimal notedeck WASM app.
+ *
+ * Build:
+ * clang --target=wasm32 -nostdlib \
+ * -Wl,--no-entry -Wl,--export=nd_update -Wl,--allow-undefined \
+ * -o hello.wasm hello.c
+ */
+
+#include "../api/notedeck_api.h"
+
+static int count = 0;
+
+/* simple int-to-string, returns length written */
+static int itoa_simple(int n, char *buf, int buf_size) {
+ if (buf_size < 2) return 0;
+ if (n == 0) { buf[0] = '0'; return 1; }
+
+ int neg = 0;
+ if (n < 0) { neg = 1; n = -n; }
+
+ int len = 0;
+ char tmp[16];
+ while (n > 0 && len < 16) {
+ tmp[len++] = '0' + (n % 10);
+ n /= 10;
+ }
+ if (neg && len < 16) tmp[len++] = '-';
+
+ if (len > buf_size) len = buf_size;
+ for (int i = 0; i < len; i++) {
+ buf[i] = tmp[len - 1 - i];
+ }
+ return len;
+}
+
+void nd_update(void) {
+ nd_heading("Hello from WASM!", 16);
+ nd_add_space(8.0f);
+
+ if (nd_button("Click me", 8)) {
+ count++;
+ }
+
+ nd_add_space(4.0f);
+
+ char buf[48];
+ /* "Clicks: " prefix */
+ buf[0]='C'; buf[1]='l'; buf[2]='i'; buf[3]='c';
+ buf[4]='k'; buf[5]='s'; buf[6]=':'; buf[7]=' ';
+ int num_len = itoa_simple(count, buf + 8, 40);
+ nd_label(buf, 8 + num_len);
+}
diff --git a/crates/notedeck_wasm/src/commands.rs b/crates/notedeck_wasm/src/commands.rs
@@ -0,0 +1,46 @@
+use std::collections::HashMap;
+
+pub enum UiCommand {
+ Label(String),
+ Heading(String),
+ Button(String),
+ AddSpace(f32),
+}
+
+/// Render buffered commands into egui, returning button click events.
+/// Keys are `button_key(text, occurrence)`.
+pub fn render_commands(commands: &[UiCommand], ui: &mut egui::Ui) -> HashMap<String, bool> {
+ let mut events = HashMap::new();
+ let mut button_occ: HashMap<&str, u32> = HashMap::new();
+
+ for cmd in commands {
+ match cmd {
+ UiCommand::Label(text) => {
+ ui.label(text.as_str());
+ }
+ UiCommand::Heading(text) => {
+ ui.heading(text.as_str());
+ }
+ UiCommand::Button(text) => {
+ let occ = button_occ.entry(text.as_str()).or_insert(0);
+ let key = button_key(text, *occ);
+ *occ += 1;
+ let clicked = ui.button(text.as_str()).clicked();
+ events.insert(key, clicked);
+ }
+ UiCommand::AddSpace(px) => {
+ ui.add_space(*px);
+ }
+ }
+ }
+
+ events
+}
+
+pub fn button_key(text: &str, occurrence: u32) -> String {
+ if occurrence == 0 {
+ text.to_string()
+ } else {
+ format!("{}#{}", text, occurrence)
+ }
+}
diff --git a/crates/notedeck_wasm/src/host_fns.rs b/crates/notedeck_wasm/src/host_fns.rs
@@ -0,0 +1,87 @@
+use crate::commands::{button_key, UiCommand};
+use std::collections::HashMap;
+use wasmer::{FunctionEnv, FunctionEnvMut, Imports, Memory, MemoryView, Store};
+
+pub struct HostEnv {
+ pub memory: Option<Memory>,
+ pub commands: Vec<UiCommand>,
+ pub button_events: HashMap<String, bool>,
+ pub button_occ: HashMap<String, u32>,
+}
+
+impl HostEnv {
+ pub fn new() -> Self {
+ Self {
+ memory: None,
+ commands: Vec::new(),
+ button_events: HashMap::new(),
+ button_occ: HashMap::new(),
+ }
+ }
+}
+
+/// Read a UTF-8 string from WASM linear memory.
+fn read_wasm_str(view: &MemoryView, ptr: i32, len: i32) -> Option<String> {
+ let ptr = ptr as u64;
+ let len = len as usize;
+ let mut buf = vec![0u8; len];
+ view.read(ptr, &mut buf).ok()?;
+ String::from_utf8(buf).ok()
+}
+
+/// Register all host imports into the given store.
+pub fn create_imports(store: &mut Store, env: &FunctionEnv<HostEnv>) -> Imports {
+ use wasmer::Function;
+
+ fn nd_label(mut env: FunctionEnvMut<HostEnv>, ptr: i32, len: i32) {
+ let (data, store) = env.data_and_store_mut();
+ let memory = data.memory.as_ref().expect("memory not set");
+ let view = memory.view(&store);
+ if let Some(text) = read_wasm_str(&view, ptr, len) {
+ data.commands.push(UiCommand::Label(text));
+ }
+ }
+
+ fn nd_heading(mut env: FunctionEnvMut<HostEnv>, ptr: i32, len: i32) {
+ let (data, store) = env.data_and_store_mut();
+ let memory = data.memory.as_ref().expect("memory not set");
+ let view = memory.view(&store);
+ if let Some(text) = read_wasm_str(&view, ptr, len) {
+ data.commands.push(UiCommand::Heading(text));
+ }
+ }
+
+ fn nd_button(mut env: FunctionEnvMut<HostEnv>, ptr: i32, len: i32) -> i32 {
+ let (data, store) = env.data_and_store_mut();
+ let memory = data.memory.as_ref().expect("memory not set");
+ let view = memory.view(&store);
+ if let Some(text) = read_wasm_str(&view, ptr, len) {
+ let occ = data.button_occ.entry(text.clone()).or_insert(0);
+ let key = button_key(&text, *occ);
+ *occ += 1;
+ let clicked = data.button_events.get(&key).copied().unwrap_or(false);
+ data.commands.push(UiCommand::Button(text));
+ if clicked {
+ 1
+ } else {
+ 0
+ }
+ } else {
+ 0
+ }
+ }
+
+ fn nd_add_space(mut env: FunctionEnvMut<HostEnv>, pixels: f32) {
+ let (data, _store) = env.data_and_store_mut();
+ data.commands.push(UiCommand::AddSpace(pixels));
+ }
+
+ wasmer::imports! {
+ "env" => {
+ "nd_label" => Function::new_typed_with_env(store, env, nd_label),
+ "nd_heading" => Function::new_typed_with_env(store, env, nd_heading),
+ "nd_button" => Function::new_typed_with_env(store, env, nd_button),
+ "nd_add_space" => Function::new_typed_with_env(store, env, nd_add_space),
+ }
+ }
+}
diff --git a/crates/notedeck_wasm/src/lib.rs b/crates/notedeck_wasm/src/lib.rs
@@ -0,0 +1,365 @@
+mod commands;
+mod host_fns;
+
+use host_fns::HostEnv;
+use notedeck::{AppContext, AppResponse};
+use wasmer::{FunctionEnv, Instance, Module, Store};
+
+pub struct WasmApp {
+ store: Store,
+ instance: Instance,
+ env: FunctionEnv<HostEnv>,
+ name: String,
+}
+
+impl WasmApp {
+ /// Load a WASM app from raw bytes.
+ pub fn from_bytes(wasm_bytes: &[u8]) -> Result<Self, Box<dyn std::error::Error>> {
+ let mut store = Store::default();
+ let module = Module::new(&store, wasm_bytes)?;
+
+ let host_env = HostEnv::new();
+ let env = FunctionEnv::new(&mut store, host_env);
+
+ let imports = host_fns::create_imports(&mut store, &env);
+ let instance = Instance::new(&mut store, &module, &imports)?;
+
+ // Give host functions access to WASM linear memory.
+ let memory = instance.exports.get_memory("memory")?.clone();
+ env.as_mut(&mut store).memory = Some(memory.clone());
+
+ // Read app name from exported globals, if present.
+ let name =
+ read_app_name(&instance, &mut store, &memory).unwrap_or_else(|| "WASM App".to_string());
+
+ Ok(Self {
+ store,
+ instance,
+ env,
+ name,
+ })
+ }
+
+ /// Load a WASM app from a file path.
+ pub fn from_file(path: &std::path::Path) -> Result<Self, Box<dyn std::error::Error>> {
+ let bytes = std::fs::read(path)?;
+ Self::from_bytes(&bytes)
+ }
+
+ /// The display name of this WASM app.
+ pub fn name(&self) -> &str {
+ &self.name
+ }
+}
+
+/// Read app name from WASM exports: nd_app_name_ptr (i32) and nd_app_name_len (i32).
+fn read_app_name(
+ instance: &Instance,
+ store: &mut Store,
+ memory: &wasmer::Memory,
+) -> Option<String> {
+ let ptr_global = instance.exports.get_global("nd_app_name_ptr").ok()?;
+ let len_global = instance.exports.get_global("nd_app_name_len").ok()?;
+
+ let ptr = ptr_global.get(store).i32()? as u64;
+ let len = len_global.get(store).i32()? as usize;
+
+ if len == 0 {
+ return None;
+ }
+
+ let view = memory.view(store);
+ let mut buf = vec![0u8; len];
+ view.read(ptr, &mut buf).ok()?;
+ String::from_utf8(buf).ok()
+}
+
+impl notedeck::App for WasmApp {
+ fn update(&mut self, _ctx: &mut AppContext<'_>, ui: &mut egui::Ui) -> AppResponse {
+ // 1. Clear commands and reset occurrence counter
+ {
+ let data = self.env.as_mut(&mut self.store);
+ data.commands.clear();
+ data.button_occ.clear();
+ }
+
+ // 2. Run WASM — host functions push commands
+ let nd_update = self
+ .instance
+ .exports
+ .get_function("nd_update")
+ .expect("WASM module must export nd_update");
+ if let Err(e) = nd_update.call(&mut self.store, &[]) {
+ tracing::error!("WASM nd_update error: {e}");
+ }
+
+ // 3. Take commands and render with real UI
+ let cmds = {
+ let data = self.env.as_mut(&mut self.store);
+ std::mem::take(&mut data.commands)
+ };
+ let new_events = commands::render_commands(&cmds, ui);
+
+ // 4. Store events for next frame
+ self.env.as_mut(&mut self.store).button_events = new_events;
+
+ AppResponse::none()
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use crate::commands::UiCommand;
+
+ /// Helper: compile WAT to WASM bytes and load as WasmApp.
+ fn app_from_wat(wat: &str) -> WasmApp {
+ let wasm = wat::parse_str(wat).expect("valid WAT");
+ WasmApp::from_bytes(&wasm).expect("load WASM module")
+ }
+
+ /// Helper: run one frame of the WASM app inside a headless egui context.
+ /// Returns the commands that were generated.
+ fn run_update(app: &mut WasmApp) -> Vec<UiCommand> {
+ let mut result_cmds = Vec::new();
+ let ctx = egui::Context::default();
+ let _ = ctx.run(egui::RawInput::default(), |ctx| {
+ egui::CentralPanel::default().show(ctx, |ui| {
+ // Clear + reset
+ {
+ let data = app.env.as_mut(&mut app.store);
+ data.commands.clear();
+ data.button_occ.clear();
+ }
+
+ // Run WASM
+ let nd_update = app
+ .instance
+ .exports
+ .get_function("nd_update")
+ .expect("nd_update");
+ nd_update.call(&mut app.store, &[]).expect("nd_update ok");
+
+ // Grab commands before rendering
+ let cmds = {
+ let data = app.env.as_mut(&mut app.store);
+ std::mem::take(&mut data.commands)
+ };
+ result_cmds = cmds
+ .iter()
+ .map(|c| match c {
+ UiCommand::Label(t) => UiCommand::Label(t.clone()),
+ UiCommand::Heading(t) => UiCommand::Heading(t.clone()),
+ UiCommand::Button(t) => UiCommand::Button(t.clone()),
+ UiCommand::AddSpace(px) => UiCommand::AddSpace(*px),
+ })
+ .collect();
+
+ // Render and collect events
+ let new_events = commands::render_commands(&cmds, ui);
+ app.env.as_mut(&mut app.store).button_events = new_events;
+ });
+ });
+ result_cmds
+ }
+
+ #[test]
+ fn load_empty_module() {
+ let app = app_from_wat(
+ r#"(module
+ (memory (export "memory") 1)
+ (func (export "nd_update"))
+ )"#,
+ );
+ assert!(app.instance.exports.get_function("nd_update").is_ok());
+ }
+
+ #[test]
+ fn run_noop_update() {
+ let mut app = app_from_wat(
+ r#"(module
+ (memory (export "memory") 1)
+ (func (export "nd_update"))
+ )"#,
+ );
+ let cmds = run_update(&mut app);
+ assert!(cmds.is_empty());
+ }
+
+ #[test]
+ fn call_nd_label() {
+ let mut app = app_from_wat(
+ r#"(module
+ (import "env" "nd_label" (func $nd_label (param i32 i32)))
+ (memory (export "memory") 1)
+ (data (i32.const 0) "hi")
+ (func (export "nd_update")
+ (call $nd_label (i32.const 0) (i32.const 2))
+ )
+ )"#,
+ );
+ let cmds = run_update(&mut app);
+ assert_eq!(cmds.len(), 1);
+ assert!(matches!(&cmds[0], UiCommand::Label(t) if t == "hi"));
+ }
+
+ #[test]
+ fn call_nd_heading() {
+ let mut app = app_from_wat(
+ r#"(module
+ (import "env" "nd_heading" (func $nd_heading (param i32 i32)))
+ (memory (export "memory") 1)
+ (data (i32.const 0) "Title")
+ (func (export "nd_update")
+ (call $nd_heading (i32.const 0) (i32.const 5))
+ )
+ )"#,
+ );
+ let cmds = run_update(&mut app);
+ assert_eq!(cmds.len(), 1);
+ assert!(matches!(&cmds[0], UiCommand::Heading(t) if t == "Title"));
+ }
+
+ #[test]
+ fn call_nd_button() {
+ let mut app = app_from_wat(
+ r#"(module
+ (import "env" "nd_button" (func $nd_button (param i32 i32) (result i32)))
+ (memory (export "memory") 1)
+ (data (i32.const 0) "Click")
+ (func (export "nd_update")
+ (drop (call $nd_button (i32.const 0) (i32.const 5)))
+ )
+ )"#,
+ );
+ let cmds = run_update(&mut app);
+ assert_eq!(cmds.len(), 1);
+ assert!(matches!(&cmds[0], UiCommand::Button(t) if t == "Click"));
+ }
+
+ #[test]
+ fn call_nd_add_space() {
+ let mut app = app_from_wat(
+ r#"(module
+ (import "env" "nd_add_space" (func $nd_add_space (param f32)))
+ (memory (export "memory") 1)
+ (func (export "nd_update")
+ (call $nd_add_space (f32.const 10.0))
+ )
+ )"#,
+ );
+ let cmds = run_update(&mut app);
+ assert_eq!(cmds.len(), 1);
+ assert!(matches!(&cmds[0], UiCommand::AddSpace(px) if (*px - 10.0).abs() < f32::EPSILON));
+ }
+
+ #[test]
+ fn call_multiple_host_fns() {
+ let mut app = app_from_wat(
+ r#"(module
+ (import "env" "nd_heading" (func $nd_heading (param i32 i32)))
+ (import "env" "nd_label" (func $nd_label (param i32 i32)))
+ (import "env" "nd_button" (func $nd_button (param i32 i32) (result i32)))
+ (import "env" "nd_add_space" (func $nd_add_space (param f32)))
+ (memory (export "memory") 1)
+ (data (i32.const 0) "Hello")
+ (data (i32.const 5) "World")
+ (data (i32.const 10) "Btn")
+ (func (export "nd_update")
+ (call $nd_heading (i32.const 0) (i32.const 5))
+ (call $nd_add_space (f32.const 8.0))
+ (call $nd_label (i32.const 5) (i32.const 5))
+ (drop (call $nd_button (i32.const 10) (i32.const 3)))
+ )
+ )"#,
+ );
+ let cmds = run_update(&mut app);
+ assert_eq!(cmds.len(), 4);
+ assert!(matches!(&cmds[0], UiCommand::Heading(t) if t == "Hello"));
+ assert!(matches!(&cmds[1], UiCommand::AddSpace(_)));
+ assert!(matches!(&cmds[2], UiCommand::Label(t) if t == "World"));
+ assert!(matches!(&cmds[3], UiCommand::Button(t) if t == "Btn"));
+ }
+
+ #[test]
+ fn button_returns_prev_frame_event() {
+ // Module that stores nd_button's return value in a global.
+ let mut app = app_from_wat(
+ r#"(module
+ (import "env" "nd_button" (func $nd_button (param i32 i32) (result i32)))
+ (memory (export "memory") 1)
+ (data (i32.const 0) "Click")
+ (global $result (mut i32) (i32.const -1))
+ (global (export "btn_result") (mut i32) (i32.const -1))
+ (func (export "nd_update")
+ (global.set $result (call $nd_button (i32.const 0) (i32.const 5)))
+ (global.set 1 (global.get $result))
+ )
+ )"#,
+ );
+
+ // Frame 1: no previous events, button returns 0
+ run_update(&mut app);
+ let result = app
+ .instance
+ .exports
+ .get_global("btn_result")
+ .unwrap()
+ .get(&mut app.store)
+ .i32()
+ .unwrap();
+ assert_eq!(result, 0, "first frame: button should return 0");
+
+ // Simulate a click by injecting an event
+ app.env
+ .as_mut(&mut app.store)
+ .button_events
+ .insert("Click".to_string(), true);
+
+ // Frame 2: button should now return 1
+ run_update(&mut app);
+ let result = app
+ .instance
+ .exports
+ .get_global("btn_result")
+ .unwrap()
+ .get(&mut app.store)
+ .i32()
+ .unwrap();
+ assert_eq!(
+ result, 1,
+ "second frame: button should return 1 after click"
+ );
+ }
+
+ #[test]
+ fn app_name_from_exports() {
+ let app = app_from_wat(
+ r#"(module
+ (memory (export "memory") 1)
+ (data (i32.const 500) "Test App")
+ (global (export "nd_app_name_ptr") i32 (i32.const 500))
+ (global (export "nd_app_name_len") i32 (i32.const 8))
+ (func (export "nd_update"))
+ )"#,
+ );
+ assert_eq!(app.name(), "Test App");
+ }
+
+ #[test]
+ fn app_name_defaults_when_missing() {
+ let app = app_from_wat(
+ r#"(module
+ (memory (export "memory") 1)
+ (func (export "nd_update"))
+ )"#,
+ );
+ assert_eq!(app.name(), "WASM App");
+ }
+
+ #[test]
+ fn from_bytes_rejects_invalid_wasm() {
+ let result = WasmApp::from_bytes(b"not wasm");
+ assert!(result.is_err());
+ }
+}
