Implement git commit

Author: AtkinsSJ

packages/git/src/git-helpers.js

@@ -70,3 +70,16 @@ export const find_repo_root = async (fs, pwd) => {
 
     throw new Error('not a git repository (or any of the parent directories): .git');
 }
+
+/**
+ * Produce a shortened version of the given hash, which is still unique within the repo.
+ * @param hash
+ * @param fs
+ * @param repository_dir
+ * @param git_dir
+ * @returns {Promise<String>} The shortened hash
+ */
+export const shorten_hash = async (hash, { fs, repository_dir, git_dir }) => {
+    // TODO: Ensure that whatever we produce is unique within the repo
+    return hash.slice(0, 7);
+}

packages/git/src/subcommands/__exports__.js

@@ -18,11 +18,13 @@
  */
 // Generated by /tools/gen.js
 import module_add from './add.js'
+import module_commit from './commit.js'
 import module_init from './init.js'
 import module_status from './status.js'
 
 export default {
     "add": module_add,
+    "commit": module_commit,
     "init": module_init,
     "status": module_status,
 };

packages/git/src/subcommands/commit.js

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2024  Puter Technologies Inc.
+ *
+ * This file is part of Puter's Git client.
+ *
+ * Puter's Git client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+import git from 'isomorphic-git';
+import path from 'path-browserify';
+import { ErrorCodes } from '@heyputer/puter-js-common/src/PosixError.js';
+import { find_repo_root, shorten_hash } from '../git-helpers.js';
+
+export default {
+    name: 'commit',
+    args: {
+        allowPositionals: false,
+        options: {
+            message: {
+                description: 'Specify the commit message',
+                type: 'string',
+                short: 'm',
+            },
+            author: {
+                description: 'Specify the commit author, as `A U Thor <[email protected]>`',
+                type: 'string',
+            },
+        },
+    },
+    execute: async (ctx) => {
+        const { io, fs, env, args } = ctx;
+        const { stdout, stderr } = io;
+        const { options, positionals } = args;
+
+        if (!options.message) {
+            // TODO: Support opening a temporary file in an editor,
+            //  where the user can edit the commit message if it's not specified.
+            stderr('You must specify a commit message with --message or -m');
+            return 1;
+        }
+
+        const { repository_dir, git_dir } = await find_repo_root(fs, env.PWD);
+
+        let user_name;
+        let user_email;
+
+        if (options.author) {
+            const author_regex = /(.+?)\s+<(.+)>/;
+            const matches = options.author.match(author_regex);
+            if (!matches)
+                throw new Error('Failed to parse author string');
+            user_name = matches[1];
+            user_email = matches[2];
+        } else {
+            user_name = await git.getConfig({
+                fs,
+                dir: repository_dir,
+                gitdir: git_dir,
+                path: 'user.name',
+            });
+            user_email = await git.getConfig({
+                fs,
+                dir: repository_dir,
+                gitdir: git_dir,
+                path: 'user.email',
+            });
+        }
+
+        if (!user_name || !user_email) {
+            throw new Error('Missing author information. Either provide --author="A <[email protected]>" or set user.name and user.email in the git config');
+        }
+
+        const commit_hash = await git.commit({
+            fs,
+            dir: repository_dir,
+            gitdir: git_dir,
+            message: options.message,
+            author: {
+                name: user_name,
+                email: user_email,
+            },
+        });
+
+        const branch = await git.currentBranch({
+            fs,
+            dir: repository_dir,
+            gitdir: git_dir,
+        });
+        const commit_title = options.message.split('\n')[0];
+        const short_hash = await shorten_hash(commit_hash, {fs, repository_dir, git_dir});
+        let output = `[${branch} ${short_hash}] ${commit_title}\n`;
+        // TODO: --amend prints out the date of the original commit here, as:
+        //  ` Date: Fri May 17 15:45:47 2024 +0100`
+        // TODO: Print out file change count, insertion count, and deletion count
+        //  (Seems if insertions and deletions are both 0, we should print both.
+        //   Otherwise we just print nonzero ones.)
+        // TODO: Print out each file created or deleted. eg:
+        //  create mode 100644 bar
+        //  delete mode 100644 foo.txt
+        stdout(output);
+    }
+}