refactor(nothooks): make hook runner language-agnostic

Remove hardcoded nu interpreter. HookSpec gains an optional interpreter
field; runner infers from file extension (.sh, .nu, .py, .rb, .zsh,
.bash) when not set. Integration tests now use sh — no nu runtime dep
on CI.

.claude/settings.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash -c 'if [ -f Cargo.toml ]; then cargo check --quiet 2>&1 | head -20; fi'"
+          }
+        ]
+      }
+    ]
+  }
+}

HANDOFF.md

@@ -7,6 +7,7 @@ State of the `notfiles` repo as of 2026-04-03.
 ### Session 1 (2026-03-31)
 
 Restructured from a flat `src/` layout into a Cargo workspace of 5 crates:
+
 - `notcore` — shared library (types, config, paths, errors)
 - `notfiles` — dotfiles linker, migrated from `src/`
 - `notsecrets` — age key retrieval (Bitwarden/file/prompt) + SOPS decrypt
@@ -20,7 +21,7 @@ Completed the age-native redesign of `notsecrets` — all 12 tasks done.
 **All tasks complete:**
 
 | Task                                                          | Status | Commit    |
-|------|--------|--------|
+| ------------------------------------------------------------- | ------ | --------- |
 | 1: Scaffold (Cargo.toml, error.rs, domain types, legacy shim) | ✅     | `34d9e3d` |
 | 2: format.rs (age wire format parser/serializer)              | ✅     | `2476daa` |
 | 3: X25519 identity + recipient                                | ✅     | `6202c5d` |
@@ -34,6 +35,7 @@ Completed the age-native redesign of `notsecrets` — all 12 tasks done.
 | 12: notstrap migration, remove sops shell-out                 | ✅     | `58de007` |
 
 **Current state:**
+
 - 80 tests pass, 0 clippy warnings, `cargo check --workspace` clean
 - `_legacy.rs` deleted; all deprecated shims removed
 - `notsecrets` is now a self-contained age encryption/decryption library
@@ -42,6 +44,7 @@ Completed the age-native redesign of `notsecrets` — all 12 tasks done.
 - Example at `crates/notsecrets/examples/age_smoke.rs` demonstrates round-trip encrypt/decrypt
 
 Also done this session (outside notfiles):
+
 - Fixed `~/.config/sops/age/keys.txt` — was `AGE-SECRET-KEY-1TESTKEY` placeholder, now real key from 1Password item `age-key-dotfiles` (UUID `6meypnchchq3tsb32mdnzxtlia`)
 - `env.nu` now self-heals `keys.txt` from 1Password on fresh login if missing/placeholder
 - Expanded `~/.secrets` to cover 18 keys (AWS, Docker, GitHub, Slack, ElevenLabs, Groq, Mistral, LangChain/Smith, SerpAPI, Twilio, Tavily, Context7) — all via `op://` UUID refs, resolved by `op inject` at shell startup
@@ -51,29 +54,37 @@ Also done this session (outside notfiles):
 ## Pending Issues
 
 ### 1. Push to remote
+
 Several commits ahead of `gitea/main`. Push when ready.
 
 ### 2. notstrap has an empty lib.rs
+
 `crates/notstrap/src/lib.rs` is empty — created as a stub. Either delete `[lib]` from `notstrap/Cargo.toml` or remove the file.
 
 ### 3. notstrap config not documented
+
 `notstrap.toml` format is defined inline via serde structs but never written down. A sample config would help.
 
 ### 4. Integration test coverage for nothooks assumes nu in PATH
+
 `nothooks` integration tests call `nu` directly. CI needs `nu` installed or tests need `#[ignore]` + feature flag.
 
 ### 5. notstrap sops_file path footgun
+
 If `sops_file` in `notstrap.toml` is an absolute path, the `join` will silently override the base. Low priority.
 
 ### 6. HuggingFace token not in ~/.secrets
+
 No API token found in 1Password — only login credentials. Add token manually if needed.
 
 ### 7. notsecrets is not wire-compatible with standard age
+
 The Encryptor/Decryptor use single-block ChaCha20-Poly1305 rather than the STREAM construction. Files encrypted by `notsecrets` cannot be decrypted by `rage`/`age` CLI and vice versa. This is intentional per the spec but worth documenting.
 
 ### Session 3 (2026-04-03)
 
 **notgraph** — crate dependency + module graph report landed and polished:
+
 - Heatmap coloring on crate nodes (fan-in intensity → blue gradient)
 - Per-crate module graphs (Mermaid `flowchart TD`) with `__`-separated node IDs
 - Cycle callouts with `cycle-entry` CSS class
@@ -84,7 +95,7 @@ The Encryptor/Decryptor use single-block ChaCha20-Poly1305 rather than the STREA
 **notgraph planned extensions** (not yet implemented — prioritized list):
 
 | Priority | Section                 | Data source                                               | Visualization                                |
-|----------|---------|-------------|---------------|
+| -------- | ----------------------- | --------------------------------------------------------- | -------------------------------------------- |
 | 1        | Code coverage heatmap   | `cargo llvm-cov --json`                                   | Treemap or per-crate bar                     |
 | 2        | Cyclomatic complexity   | `rust-code-analysis-cli --metrics`                        | Histogram + top-offenders table              |
 | 3        | Lines of code breakdown | `tokei --output json`                                     | Stacked bar (code/comments/blanks)           |

HANDOFF.notfiles.workspace.yaml

@@ -8,7 +8,7 @@ state:
   notes: null
 items:
 - id: notfile-1
-  doob_uuid: 6d9780fe-d6d9-4316-90b5-6de44f06e96e
+  doob_uuid: d1c0adc2-028a-4a12-be84-0698587f6f35
   name: public-ready-workflow-fix
   priority: P1
   status: done
@@ -23,7 +23,7 @@ items:
     note: emoji → [OK] formatting change; committed in style commit
   completed: 2026-04-03
 - id: notfile-2
-  doob_uuid: a7ff6a74-a664-4a0e-9a13-3e3884e5d492
+  doob_uuid: b88a6135-3ecb-419e-aaac-22cb87595f90
   name: notgraph-integration-test-fix
   priority: P1
   status: done
@@ -38,7 +38,7 @@ items:
     note: cargo fmt reformatted long emit::write_all calls; committed in style commit
   completed: 2026-04-03
 - id: notfile-3
-  doob_uuid: 49346e3f-0119-4e1f-9234-c59f14499aea
+  doob_uuid: 615051dd-d22c-4d50-ad70-15497780726b
   name: notgraph-plan-remaining-steps
   priority: P2
   status: done

crates/notcore/src/types.rs

@@ -21,6 +21,8 @@ pub struct HookSpec {
     pub name: String,
     pub script: String,
     pub phase: HookPhase,
+    #[serde(default)]
+    pub interpreter: Option<String>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]

crates/nothooks/src/runner.rs

@@ -4,6 +4,28 @@ use notcore::{HookPhase, HookSpec};
 use std::path::PathBuf;
 use std::process::Command;
 
+fn resolve_interpreter(spec: &HookSpec) -> Result<String, String> {
+    if let Some(interp) = &spec.interpreter {
+        return Ok(interp.clone());
+    }
+    let ext = std::path::Path::new(&spec.script)
+        .extension()
+        .and_then(|e| e.to_str())
+        .unwrap_or("");
+    match ext {
+        "nu" => Ok("nu".into()),
+        "sh" => Ok("sh".into()),
+        "bash" => Ok("bash".into()),
+        "zsh" => Ok("zsh".into()),
+        "py" => Ok("python3".into()),
+        "rb" => Ok("ruby".into()),
+        _ => Err(format!(
+            "cannot infer interpreter: no interpreter set and unknown extension {:?}",
+            ext
+        )),
+    }
+}
+
 pub struct HookRunner {
     state_dir: PathBuf,
     force: bool,
@@ -31,8 +53,11 @@ impl HookRunner {
             return HookResult::Skipped;
         }
 
-        // TODO: support other shells
-        let result = Command::new("nu").arg(&spec.script).status();
+        let interp = match resolve_interpreter(spec) {
+            Ok(i) => i,
+            Err(msg) => return HookResult::Failed(msg),
+        };
+        let result = Command::new(&interp).arg(&spec.script).status();
 
         match result {
             Ok(status) if status.success() => {

crates/nothooks/tests/integration.rs

@@ -4,19 +4,20 @@ use std::fs;
 use tempfile::TempDir;
 
 fn make_hook_script(dir: &TempDir, name: &str, content: &str) -> HookSpec {
-    let path = dir.path().join(format!("{name}.nu"));
+    let path = dir.path().join(format!("{name}.sh"));
     fs::write(&path, content).unwrap();
     HookSpec {
         name: name.to_string(),
         script: path.to_str().unwrap().to_string(),
         phase: HookPhase::Dot,
+        interpreter: None,
     }
 }
 
 #[test]
 fn test_hook_success() {
     let dir = TempDir::new().unwrap();
-    let spec = make_hook_script(&dir, "ok-hook", "print hello");
+    let spec = make_hook_script(&dir, "ok-hook", "echo hello");
     let runner = HookRunner::new(dir.path().to_path_buf());
     let result = runner.run_hook(&spec);
     assert!(matches!(result, HookResult::Ok));
@@ -25,7 +26,7 @@ fn test_hook_success() {
 #[test]
 fn test_hook_failure() {
     let dir = TempDir::new().unwrap();
-    let spec = make_hook_script(&dir, "fail-hook", "exit 1\n");
+    let spec = make_hook_script(&dir, "fail-hook", "exit 1");
     let runner = HookRunner::new(dir.path().to_path_buf());
     let result = runner.run_hook(&spec);
     assert!(matches!(result, HookResult::Failed(_)));
@@ -34,7 +35,7 @@ fn test_hook_failure() {
 #[test]
 fn test_setup_hook_skipped_on_rerun() {
     let dir = TempDir::new().unwrap();
-    let mut spec = make_hook_script(&dir, "setup-hook", "print ran");
+    let mut spec = make_hook_script(&dir, "setup-hook", "echo ran");
     spec.phase = notcore::HookPhase::Setup;
 
     let runner = HookRunner::new(dir.path().to_path_buf());
@@ -49,7 +50,7 @@ fn test_setup_hook_skipped_on_rerun() {
 #[test]
 fn test_setup_hook_force_reruns() {
     let dir = TempDir::new().unwrap();
-    let mut spec = make_hook_script(&dir, "force-hook", "print ran");
+    let mut spec = make_hook_script(&dir, "force-hook", "echo ran");
     spec.phase = notcore::HookPhase::Setup;
 
     let runner = HookRunner::new(dir.path().to_path_buf());

tests/integration/tests/bootstrap.rs

@@ -186,6 +186,7 @@ fn test_setup_hooks_skipped_on_rerun() {
         name: HOOK_NAME.to_string(),
         script: script.to_str().unwrap().to_string(),
         phase: HookPhase::Setup,
+        interpreter: None,
     };
     let runner = HookRunner::new(d.to_path_buf());
     let phase_report = run_phase(&[hook_spec], &HookPhase::Setup, &runner);

tests/integration/tests/cross_crate.rs

@@ -35,6 +35,7 @@ fn test_nothooks_notsecrets_independent() {
         name: "chain".to_string(),
         script: script.to_str().unwrap().to_string(),
         phase: HookPhase::Dot,
+        interpreter: None,
     };
 
     let runner = HookRunner::new(dir.path().to_path_buf());