Add selective file staging to commit dialog

apps/server/src/git/Layers/GitCore.test.ts

@@ -97,7 +97,7 @@ const makeIsolatedGitCore = (gitService: GitServiceShape) =>
     return {
       status: (input) => core.status(input),
       statusDetails: (cwd) => core.statusDetails(cwd),
-      prepareCommitContext: (cwd) => core.prepareCommitContext(cwd),
+      prepareCommitContext: (cwd, filePaths?) => core.prepareCommitContext(cwd, filePaths),
       commit: (cwd, subject, body) => core.commit(cwd, subject, body),
       pushCurrentBranch: (cwd, fallbackBranch) => core.pushCurrentBranch(cwd, fallbackBranch),
       pullCurrentBranch: (cwd) => core.pullCurrentBranch(cwd),
@@ -1711,6 +1711,45 @@ it.layer(TestLayer)("git integration", (it) => {
       }),
     );
 
+    it.effect("prepareCommitContext stages only selected files when filePaths provided", () =>
+      Effect.gen(function* () {
+        const tmp = yield* makeTmpDir();
+        yield* initRepoWithCommit(tmp);
+        const core = yield* GitCore;
+
+        yield* writeTextFile(path.join(tmp, "a.txt"), "file a\n");
+        yield* writeTextFile(path.join(tmp, "b.txt"), "file b\n");
+
+        const context = yield* core.prepareCommitContext(tmp, ["a.txt"]);
+        expect(context).not.toBeNull();
+        expect(context!.stagedSummary).toContain("a.txt");
+        expect(context!.stagedSummary).not.toContain("b.txt");
+
+        yield* core.commit(tmp, "Add only a.txt", "");
+
+        // b.txt should still be untracked after commit
+        const statusAfter = yield* git(tmp, ["status", "--porcelain"]);
+        expect(statusAfter).toContain("b.txt");
+        expect(statusAfter).not.toContain("a.txt");
+      }),
+    );
+
+    it.effect("prepareCommitContext stages everything when filePaths is undefined", () =>
+      Effect.gen(function* () {
+        const tmp = yield* makeTmpDir();
+        yield* initRepoWithCommit(tmp);
+        const core = yield* GitCore;
+
+        yield* writeTextFile(path.join(tmp, "a.txt"), "file a\n");
+        yield* writeTextFile(path.join(tmp, "b.txt"), "file b\n");
+
+        const context = yield* core.prepareCommitContext(tmp);
+        expect(context).not.toBeNull();
+        expect(context!.stagedSummary).toContain("a.txt");
+        expect(context!.stagedSummary).toContain("b.txt");
+      }),
+    );
+
     it.effect("pushes with upstream setup and then skips when up to date", () =>
       Effect.gen(function* () {
         const tmp = yield* makeTmpDir();

apps/server/src/git/Layers/GitCore.ts

@@ -766,9 +766,21 @@ const makeGitCore = Effect.gen(function* () {
       })),
     );
 
-  const prepareCommitContext: GitCoreShape["prepareCommitContext"] = (cwd) =>
+  const prepareCommitContext: GitCoreShape["prepareCommitContext"] = (cwd, filePaths) =>
     Effect.gen(function* () {
-      yield* runGit("GitCore.prepareCommitContext.addAll", cwd, ["add", "-A"]);
+      if (filePaths && filePaths.length > 0) {
+        yield* runGit("GitCore.prepareCommitContext.reset", cwd, ["reset"]).pipe(
+          Effect.catch(() => Effect.void),
+        );
+        yield* runGit("GitCore.prepareCommitContext.addSelected", cwd, [
+          "add",
+          "-A",
+          "--",
+          ...filePaths,
+        ]);
+      } else {
+        yield* runGit("GitCore.prepareCommitContext.addAll", cwd, ["add", "-A"]);
+      }
 
       const stagedSummary = yield* runGitStdout("GitCore.prepareCommitContext.stagedSummary", cwd, [
         "diff",

apps/server/src/git/Layers/GitManager.test.ts

@@ -451,6 +451,7 @@ function runStackedAction(
     action: "commit" | "commit_push" | "commit_push_pr";
     commitMessage?: string;
     featureBranch?: boolean;
+    filePaths?: readonly string[];
   },
 ) {
   return manager.runStackedAction(input);
@@ -767,6 +768,31 @@ it.layer(GitManagerTestLayer)("GitManager", (it) => {
     }),
   );
 
+  it.effect("commits only selected files when filePaths is provided", () =>
+    Effect.gen(function* () {
+      const repoDir = yield* makeTempDir("t3code-git-manager-");
+      yield* initRepo(repoDir);
+      fs.writeFileSync(path.join(repoDir, "a.txt"), "file a\n");
+      fs.writeFileSync(path.join(repoDir, "b.txt"), "file b\n");
+
+      const { manager } = yield* makeManager();
+      const result = yield* runStackedAction(manager, {
+        cwd: repoDir,
+        action: "commit",
+        filePaths: ["a.txt"],
+      });
+
+      expect(result.commit.status).toBe("created");
+
+      // b.txt should remain in the working tree
+      const statusStdout = yield* runGit(repoDir, ["status", "--porcelain"]).pipe(
+        Effect.map((r) => r.stdout),
+      );
+      expect(statusStdout).toContain("b.txt");
+      expect(statusStdout).not.toContain("a.txt");
+    }),
+  );
+
   it.effect("creates feature branch, commits, and pushes with featureBranch option", () =>
     Effect.gen(function* () {
       const repoDir = yield* makeTempDir("t3code-git-manager-");

apps/server/src/git/Layers/GitManager.ts

@@ -638,9 +638,10 @@ export const makeGitManager = Effect.gen(function* () {
     commitMessage?: string;
     /** When true, also produce a semantic feature branch name. */
     includeBranch?: boolean;
+    filePaths?: readonly string[];
   }) =>
     Effect.gen(function* () {
-      const context = yield* gitCore.prepareCommitContext(input.cwd);
+      const context = yield* gitCore.prepareCommitContext(input.cwd, input.filePaths);
       if (!context) {
         return null;
       }
@@ -680,6 +681,7 @@ export const makeGitManager = Effect.gen(function* () {
     branch: string | null,
     commitMessage?: string,
     preResolvedSuggestion?: CommitAndBranchSuggestion,
+    filePaths?: readonly string[],
   ) =>
     Effect.gen(function* () {
       const suggestion =
@@ -688,6 +690,7 @@ export const makeGitManager = Effect.gen(function* () {
           cwd,
           branch,
           ...(commitMessage ? { commitMessage } : {}),
+          ...(filePaths ? { filePaths } : {}),
         }));
       if (!suggestion) {
         return { status: "skipped_no_changes" as const };
@@ -964,12 +967,18 @@ export const makeGitManager = Effect.gen(function* () {
     },
   );
 
-  const runFeatureBranchStep = (cwd: string, branch: string | null, commitMessage?: string) =>
+  const runFeatureBranchStep = (
+    cwd: string,
+    branch: string | null,
+    commitMessage?: string,
+    filePaths?: readonly string[],
+  ) =>
     Effect.gen(function* () {
       const suggestion = yield* resolveCommitAndBranchSuggestion({
         cwd,
         branch,
         ...(commitMessage ? { commitMessage } : {}),
+        ...(filePaths ? { filePaths } : {}),
         includeBranch: true,
       });
       if (!suggestion) {
@@ -1018,6 +1027,7 @@ export const makeGitManager = Effect.gen(function* () {
           input.cwd,
           initialStatus.branch,
           input.commitMessage,
+          input.filePaths,
         );
         branchStep = result.branchStep;
         commitMessageForStep = result.resolvedCommitMessage;
@@ -1033,6 +1043,7 @@ export const makeGitManager = Effect.gen(function* () {
         currentBranch,
         commitMessageForStep,
         preResolvedCommitSuggestion,
+        input.filePaths,
       );
 
       const push = wantsPush

apps/server/src/git/Services/GitCore.ts

@@ -101,6 +101,7 @@ export interface GitCoreShape {
    */
   readonly prepareCommitContext: (
     cwd: string,
+    filePaths?: readonly string[],
   ) => Effect.Effect<GitPreparedCommitContext | null, GitCommandError>;
 
   /**