Git styled -h and --issue options

Use git-sh-setup (like git rebase) to get git styled help (-h) option
and -i, --issue for issue option

git-open

@@ -1,11 +1,40 @@
 #!/usr/bin/env bash
 
-# Opens the GitHub page for a repo/branch in your browser.
-# https://github.com/paulirish/git-open/
-#
-# git open
-# git open [remote] [branch]
+# Use git-sh-setup, similar to git-rebase
+# https://www.kernel.org/pub/software/scm/git/docs/git-sh-setup.html
+# https://github.com/git/git/blob/master/git-rebase.sh
+# shellcheck disable=SC2034
+OPTIONS_STUCKLONG=t
+# shellcheck disable=SC2034
+OPTIONS_KEEPDASHDASH=
+# shellcheck disable=SC2034
+OPTIONS_SPEC="\
+git open [options]
+git open [remote] [branch]
+git open issue
+--
+  Opens the GitHub page for a repo/branch in your browser.
+  https://github.com/paulirish/git-open/
 
+  Available options are
+i,issue!      open issues page
+"
+
+# https://github.com/koalaman/shellcheck/wiki/SC1090
+# shellcheck source=/dev/null
+. "$(git --exec-path)/git-sh-setup"
+
+# Defaults
+is_issue=0
+protocol="https"
+
+while test $# != 0; do
+  case "$1" in
+  --issue) is_issue=1;;
+  --) shift; break ;;
+  esac
+  shift
+done
 
 # are we in a git repo?
 if ! git rev-parse --is-inside-work-tree &>/dev/null; then
@@ -13,10 +42,6 @@ if ! git rev-parse --is-inside-work-tree &>/dev/null; then
   exit 1
 fi
 
-# Defaults
-is_issue=0
-protocol="https"
-
 # If the first argument is 'issue', we want to load the issue page
 if [[ "$1" == 'issue' ]]; then
   is_issue=1

test/git-open.bats

@@ -20,6 +20,21 @@ setup() {
   assert [ -e "$foldername/.git" ]
 }
 
+##
+## Help
+##
+
+@test "help text" {
+  run ../git-open -h
+  assert_output --partial "usage: git open"
+}
+
+@test "invalid option" {
+  run ../git-open --invalid-option
+  assert_output --partial "error: unknown option \`invalid-option'"
+  assert_output --partial "usage: git open"
+}
+
 ##
 ## GitHub
 ##
@@ -85,6 +100,15 @@ setup() {
   git checkout -B "fix-issue-36"
   run ../git-open "issue"
   assert_output "https://github.com/paulirish/git-open/issues/36"
+
+  # -i and --issue
+  git checkout -B "fix-issue-37"
+  run ../git-open "--issue"
+  assert_output "https://github.com/paulirish/git-open/issues/37"
+
+  git checkout -B "fix-issue-38"
+  run ../git-open "-i"
+  assert_output "https://github.com/paulirish/git-open/issues/38"
 }
 
 @test "gh: gist" {