Add a './g review' script to trigger CI for a commit in an easy way

Similar to gerrit's 'git review' which creates/updates a change without
clicking anywhere in a browser.

Also add a './g pull' to help those who are used to that.

Change-Id: I240ff55c7480d0a2cd6de3f2ea3cd84ca0556af4

g

@@ -0,0 +1,38 @@
+#!/bin/bash -e
+#
+# './g pull -r' just forwards to 'git pull -r'.
+#
+# './g review' to submit a pull request, assuming:
+# 1) You have 'gh' installed.
+# 2) You are a committer, so you have the permission to push to a private/nick/name branch.
+# 3) You delete this branch after the PR is merged.
+#
+
+if [ "$1" == "review" ]; then
+    if [ -z "$(type -p gh)" ]; then
+        echo "'gh' not found, install it from <https://github.com/cli/cli/blob/trunk/docs/install_linux.md>."
+        exit 1
+    fi
+
+    BRANCH=$(git symbolic-ref HEAD|sed 's|refs/heads/||')
+    REMOTE=$(git config branch.$BRANCH.remote)
+    if git rev-parse --quiet --verify $REMOTE/private/$USER/$BRANCH >/dev/null; then
+        # PR is open, just update it.
+        git push -f $REMOTE HEAD:private/$USER/$BRANCH
+    else
+        # Open a new PR.
+        git push $REMOTE HEAD:private/$USER/$BRANCH
+        git branch private/$USER/$BRANCH
+        gh pr create --base $BRANCH --head private/$USER/$BRANCH --fill
+        git branch -D private/$USER/$BRANCH
+    fi
+    exit 0
+fi
+
+if [ "$1" == "pull" ]; then
+    shift
+    git pull "$@"
+    exit 0
+fi
+
+# vim:set shiftwidth=4 softtabstop=4 expandtab: