Small refactor and allow to fixup everythindg into first commit with --fixupAll

components/git/land.js

@@ -57,6 +57,12 @@ const landOptions = {
     describe: 'Automatically rebase branches with multiple commits',
     default: false,
     type: 'boolean'
+  },
+  fixupAll: {
+    describe: 'Automatically fixup all commits to the first one dismissing ' +
+      'other commit messages',
+    default: false,
+    type: 'boolean'
   }
 };
 
@@ -175,8 +181,7 @@ async function main(state, argv, cli, req, dir) {
       cli.log('run `git node land --abort` before starting a new session');
       return;
     }
-    session = new LandingSession(cli, req, dir, argv.prid, argv.backport,
-      argv.lint, argv.autorebase);
+    session = new LandingSession(cli, req, dir, argv);
     const metadata = await getMetadata(session.argv, argv.skipRefs, cli);
     if (argv.backport) {
       const split = metadata.metadata.split('\n')[0];

lib/landing_session.js

@@ -22,19 +22,22 @@ const LINT_RESULTS = {
 };
 
 class LandingSession extends Session {
-  constructor(cli, req, dir, prid, backport, lint, autorebase) {
+  constructor(cli, req, dir,
+    { prid, backport, lint, autorebase, fixupAll } = {}) {
     super(cli, dir, prid);
     this.req = req;
     this.backport = backport;
     this.lint = lint;
     this.autorebase = autorebase;
+    this.fixupAll = fixupAll;
   }
 
   get argv() {
     const args = super.argv;
     args.backport = this.backport;
     args.lint = this.lint;
     args.autorebase = this.autorebase;
+    args.fixupAll = this.fixupAll;
     return args;
   }
 
@@ -222,6 +225,12 @@ class LandingSession extends Session {
         cli.log(`Couldn't rebase ${count} commits in the PR automatically`);
         this.makeRebaseSuggestion(subjects);
       }
+    } else if (this.fixupAll) {
+      cli.log(`There are ${subjects.length} commits in the PR. ` +
+        'Attempting to fixup everything into first commit.');
+      await runAsync('git', ['reset', '--soft', `HEAD~${subjects.length - 1}`]);
+      await runAsync('git', ['commit', '--amend', '--no-edit']);
+      return await this.amend() && this.final();
     } else {
       this.makeRebaseSuggestion(subjects);
     }