WIP

.gitignore

@@ -1,2 +1,2 @@
 node_modules/
-lib/
+lib/

src/changefile.ts

@@ -0,0 +1,19 @@
+import prompts from 'prompts';
+import { getRecentCommitMessages } from './git';
+
+export async function promptForChange() {
+  const recentMessages = getRecentCommitMessages() || [];
+
+  const response = await prompts({
+    type: 'autocomplete',
+    name: 'description',
+    message: 'Describe your changes',
+    suggest: input => {
+      return Promise.resolve(recentMessages.find(msg => msg.startsWith(input)) || input);
+    }
+  });
+
+  console.log(response); // => { value: 24 }
+}
+
+promptForChange();

src/git.ts

@@ -1,5 +1,85 @@
 import { spawnSync } from 'child_process';
 
 export function git(args: string[]) {
-  return spawnSync('git', args);
+  const results = spawnSync('git', args);
+
+  if (results.status === 0) {
+    return {
+      stderr: results.stderr.toString().trim(),
+      stdout: results.stdout.toString().trim()
+    };
+  } else {
+    return null;
+  }
+}
+
+export function getUncommittedChanges() {
+  try {
+    const results = git(['status', '--porcelain']);
+
+    if (!results) {
+      return [];
+    }
+
+    const changes = results.stdout;
+
+    if (changes.length == 0) {
+      return [];
+    }
+
+    const lines = changes.split(/\n/) || [];
+
+    return lines.map(line => line.trim().split(/ /)[1]);
+  } catch (e) {
+    console.error('Cannot gather information about changes: ', e.message);
+  }
+}
+
+export function getForkPoint(targetBranch: string = 'origin/master') {
+  try {
+    const results = git(['git', 'merge-base', '--fork-point', targetBranch, 'HEAD']);
+    if (!results) {
+      return targetBranch;
+    }
+
+    return results.stdout;
+  } catch (e) {
+    return targetBranch;
+  }
+}
+
+export function getChanges() {
+  try {
+    const forkPoint = getForkPoint();
+    const results = git(['--no-pager', 'diff', '--name-only', forkPoint + '...']);
+
+    if (!results) {
+      return [];
+    }
+
+    let changes = results.stdout;
+    let lines = changes.split(/\n/) || [];
+
+    return lines.map(line => line.trim());
+  } catch (e) {
+    console.error('Cannot gather information about changes: ', e.message);
+  }
+}
+
+export function getRecentCommitMessages() {
+  try {
+    const forkPoint = getForkPoint();
+    const results = git(['log', '--decorate', '--pretty=format:%s', '--reverse', forkPoint, 'HEAD']);
+
+    if (!results) {
+      return [];
+    }
+
+    let changes = results.stdout;
+    let lines = changes.split(/\n/) || [];
+
+    return lines.map(line => line.trim());
+  } catch (e) {
+    console.error('Cannot gather information about changes: ', e.message);
+  }
 }

src/paths.ts

@@ -43,3 +43,8 @@ export function getChangeFilePath(cwd?: string) {
 
   return null;
 }
+
+export function isChildOf(child: string, parent: string) {
+  const relativePath = path.relative(child, parent);
+  return /^[.\/\\]+$/.test(relativePath);
+}