fix(opencode): skip plugin write on literal drift, glob token extraction, segment-anchored mutation check

gitnexus/hooks/opencode/gitnexus-plugin.js

@@ -184,8 +184,13 @@ export function extractOpenCodePattern(tool, args) {
   }
   if (tool === 'glob') {
     const raw = typeof input.pattern === 'string' ? input.pattern : '';
-    const match = raw.match(/[*\/]([a-zA-Z][a-zA-Z0-9_-]{2,})/);
-    return match ? match[1] : null;
+    // Longest literal run (>=3 chars) in the glob, with glob metachars as
+    // delimiters: '**/UserService*' → UserService, 'src/**/*.ts' → src,
+    // '**/*.service.ts' → service. The older [*/]letter regex missed every
+    // recursive glob whose segments start with '*', '.', or another metachar.
+    const runs = raw.match(/[a-zA-Z0-9_-]{3,}/g);
+    if (!runs) return null;
+    return runs.reduce((best, run) => (run.length > best.length ? run : best));
   }
   if (tool === 'bash') {
     return extractBashSearchPattern(input.command);
@@ -193,12 +198,17 @@ export function extractOpenCodePattern(tool, args) {
   return null;
 }
 
-/** True for the git commands that move HEAD (same set as the Claude adapter). */
+/**
+ * True for the git commands that move HEAD (same set as the Claude adapter).
+ * Segments are checked after splitting on shell separators and each must
+ * START with `git`, so `echo 'git commit'` or `grep 'git commit' file` don't
+ * count as mutations while `cd x && git commit` still does.
+ */
 export function isGitMutationCommand(command) {
-  return (
-    typeof command === 'string' &&
-    /\bgit\s+(commit|merge|rebase|cherry-pick|pull)(\s|$)/.test(command)
-  );
+  if (typeof command !== 'string') return false;
+  return command
+    .split(/&&|\|\||;|\|/)
+    .some((seg) => /^\s*git\s+(commit|merge|rebase|cherry-pick|pull)(\s|$)/.test(seg));
 }
 
 /**

gitnexus/src/cli/setup.ts

@@ -1351,8 +1351,9 @@ async function installOpenCodePlugin(result: SetupResult): Promise<void> {
     const jsonCli = JSON.stringify(normalizedCli);
     if (!content.includes(OPENCODE_CLI_PATH_SOURCE_LITERAL)) {
       result.errors.push(
-        'OpenCode hooks: gitnexus-plugin.js no longer contains the cliPath literal to patch — the installed plugin may fail to resolve the CLI. Update OPENCODE_CLI_PATH_SOURCE_LITERAL in setup.ts.',
+        'OpenCode hooks: gitnexus-plugin.js no longer contains the cliPath literal to patch — skipping plugin install (the unpatched relative cliPath would resolve under the OpenCode config dir). Update OPENCODE_CLI_PATH_SOURCE_LITERAL in setup.ts.',
       );
+      return;
     }
     content = content.replace(OPENCODE_CLI_PATH_SOURCE_LITERAL, `let cliPath = ${jsonCli};`);
     // Sanity: the installed copy must export the plugin initializer OpenCode calls.

gitnexus/test/unit/opencode-plugin.test.ts

@@ -48,7 +48,9 @@ describe('extractOpenCodePattern', () => {
 
   it('derives a token from glob patterns', () => {
     expect(extractOpenCodePattern('glob', { pattern: '**/UserService*' })).toBe('UserService');
-    expect(extractOpenCodePattern('glob', { pattern: 'src/**/*.ts' })).toBeNull();
+    expect(extractOpenCodePattern('glob', { pattern: 'src/**/*.ts' })).toBe('src');
+    expect(extractOpenCodePattern('glob', { pattern: '**/*.service.ts' })).toBe('service');
+    expect(extractOpenCodePattern('glob', { pattern: '**/*.{a,b}' })).toBeNull();
     expect(extractOpenCodePattern('glob', {})).toBeNull();
   });
 
@@ -102,11 +104,21 @@ describe('isGitMutationCommand', () => {
     'git rebase main',
     'git cherry-pick abc',
     'git pull',
+    'cd src && git commit -m x',
+    'npm test || git pull',
   ])('detects %s', (cmd) => expect(isGitMutationCommand(cmd)).toBe(true));
 
-  it.each(['git status', 'git diff', 'git stash push', 'npm test', ''])('ignores %s', (cmd) =>
-    expect(isGitMutationCommand(cmd)).toBe(false),
-  );
+  it.each([
+    'git status',
+    'git diff',
+    'git stash push',
+    'npm test',
+    '',
+    // Text that merely mentions a mutation must not count.
+    "echo 'git commit'",
+    "grep 'git commit' file.txt",
+    'cat notes.md | grep git-pull',
+  ])('ignores %s', (cmd) => expect(isGitMutationCommand(cmd)).toBe(false));
 
   it('rejects non-strings', () => {
     expect(isGitMutationCommand(null)).toBe(false);