feat(mise): support Rust idiomatic version files (#676)

* feat(mise): support rust-toolchain.toml idiomatic version file

Generated-by: aiautocommit

* docs(rust): update rust-toolchain.toml support and resolution order

Generated-by: aiautocommit

* feat(generate): add rust support to mise toolchain settings and build plan

Generated-by: aiautocommit

core/__snapshots__/TestGenerateBuildPlanForExamples_rust-custom-toolchain_1.snap.json

@@ -43,6 +43,10 @@
     {
      "path": "/mise/shims"
     },
+    {
+     "dest": "rust-toolchain.toml",
+     "src": "rust-toolchain.toml"
+    },
     {
      "customName": "create mise config",
      "name": "generated-mise-toml",

core/generate/__snapshots__/context_test.snap

@@ -22,7 +22,7 @@
  "steps": [
   {
    "assets": {
-    "generated-mise-toml": "[tools]\n  go = \"1.23.5\"\n  node = \"20.18.2\"\n  python = \"3.13.1\"\n\n[settings]\n  idiomatic_version_file_enable_tools = [\"python\", \"node\", \"ruby\", \"elixir\", \"go\", \"java\", \"yarn\", \"bun\", \"deno\", \"dotnet\"]\n  minimum_release_age = \"14d\"\n  paranoid = true\n  trusted_config_paths = [\"/app\"]\n  [settings.node]\n    verify = false\n"
+    "generated-mise-toml": "[tools]\n  go = \"1.23.5\"\n  node = \"20.18.2\"\n  python = \"3.13.1\"\n\n[settings]\n  idiomatic_version_file_enable_tools = [\"python\", \"node\", \"ruby\", \"elixir\", \"go\", \"java\", \"yarn\", \"bun\", \"deno\", \"dotnet\", \"rust\"]\n  minimum_release_age = \"14d\"\n  paranoid = true\n  trusted_config_paths = [\"/app\"]\n  [settings.node]\n    verify = false\n"
    },
    "commands": [
     {

core/generate/mise_step_builder.go

@@ -364,6 +364,7 @@ var miseIdiomaticFiles = []string{
 	".sdkmanrc",
 	".exenv-version",
 	".deno-version",
+	"rust-toolchain.toml",
 	// .bun-version is a community convention, not officially supported by Bun
 	".bun-version",
 	".yvmrc",

core/mise/mise.go

@@ -21,7 +21,7 @@ import (
 const (
 	InstallDir                = "/tmp/railpack/mise"
 	TestInstallDir            = "/tmp/railpack/mise-test"
-	IdiomaticVersionFileTools = "python,node,ruby,elixir,go,java,yarn,bun,deno,dotnet"
+	IdiomaticVersionFileTools = "python,node,ruby,elixir,go,java,yarn,bun,deno,dotnet,rust"
 	// applied only to the first GetLatestVersion check to skip very recent releases
 	MinimumReleaseAge = "14d"
 )

docs/src/content/docs/config/mise.md

@@ -48,7 +48,8 @@ into the build. This includes:
   `.config/mise/conf.d/*.toml`
 - **Idiomatic version files**: `.ruby-version`, `.python-version`,
   `.python-versions`, `.node-version`, `.nvmrc`, `.go-version`,
-  `.java-version`, `.sdkmanrc`, `.bun-version`, `.yvmrc`, `global.json`
+  `.java-version`, `.sdkmanrc`, `.deno-version`, `rust-toolchain.toml`,
+  `.bun-version`, `.yvmrc`, `global.json`
 - **Lock files**: `mise.lock` files co-located with any detected
   `*.toml` config
 

docs/src/content/docs/languages/rust.md

@@ -16,13 +16,16 @@ Your project will be detected as a Rust application if any of these conditions a
 The Rust version is determined in the following order:
 
 - Any mise-supported version file (`mise.toml`, `.tool-versions`, etc).
-- Read from the `toolchain.channel` field in the `rust-toolchain.toml` file
 - Read from the `package.rust-version` field in the `Cargo.toml` file
 - Read from the `.rust-version` or `rust-version.txt` file
 - Set via the `RAILPACK_RUST_VERSION` environment variable
 - Set via the `package.edition` field in the `Cargo.toml` file
 - Defaults to `1.89`
 
+Mise treats `rust-toolchain.toml` as an idiomatic version file. Its
+`toolchain.channel` field selects the Rust version, while `profile`,
+`components`, and `targets` are passed to rustup as installation options.
+
 ## Runtime Variables
 
 These variables are available at runtime:
@@ -53,4 +56,4 @@ The start command is:
 
 ## BuildKit Caching
 
-The Rust provider will cache `~/.cargo/registry` under the key `cargo_registry`, `~/.cargo/git` under `cargo_git`, and `target` under `cargo_target`.
+The Rust provider will cache `~/.cargo/registry` under the key `cargo_registry`, `~/.cargo/git` under `cargo_git`, and `target` under `cargo_target`.