[PATCH 5/7] edit-link: add new builtin

[Ramkumar Ramachandra <artagnon@gmail.com>]

This is a WIP.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 git-edit-link.sh | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 git-edit-link.sh

diff --git a/git-edit-link.sh b/git-edit-link.sh
new file mode 100644
index 0000000..3ff0e84
--- /dev/null
+++ b/git-edit-link.sh
@@ -0,0 +1,87 @@
+#!/bin/sh
+# Copyright (c) 2013 Ramkumar Ramachandra
+
+dashless=$(basename "$0" | sed -e 's/-/ /')
+USAGE='[--floating] [--ref-name <name>] [--checkout-rev <rev>] [--statthrough] <directory>'
+
+SUBDIRECTORY_OK=Yes
+OPTIONS_SPEC=
+START_DIR=`pwd`
+. git-sh-setup
+. git-sh-i18n
+require_work_tree
+cd_to_toplevel
+
+link_spec="$GIT_DIR/LINK_SPEC"
+
+read_and_verify_link_spec () {
+	test -f "$link_spec" || die "fatal: could not open $link_spec."
+
+	## TODO
+	## Rules:
+	#  upstream_url is a mandatory field; others are optional
+	#  if floating is false, checkout_rev has to be a SHA-1 hex
+	#  ref_name must be a valid name, and not conflict with an existing ref
+
+	return 0;
+}
+
+# Prepare an initial link_spec using the command-line options
+rm -f "$link_spec"
+touch "$link_spec" || die "fatal: could not create $link_spec."
+
+total_argc=$#
+while test $# != 0
+do
+	case "$1" in
+		--checkout-rev)
+			shift
+			cat >>"$link_spec" <<-EOF
+			checkout_ref = $1
+			EOF
+			;;
+		--ref-name)
+			shift
+			cat >>"$link_spec" <<-EOF
+			ref_name = $1
+			EOF
+			;;
+		--floating)
+			cat >>"$link_spec" <<-\EOF
+			floating = 1
+			EOF
+			;;
+		--statthrough)
+			cat >>"$link_spec" <<-\EOF
+			statthrough = 1
+			EOF
+			;;
+		--)
+			shift
+			break
+			;;
+	esac
+	shift
+done
+
+link_directory="$1"
+test -d "$link_directory" || die "fatal: $link_directory is not a valid directory."
+
+cd "$link_directory" && {
+	test -f "$link_directory/.git" &&
+	test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ||
+	die "fatal: $link_directory is not a valid bare working tree."
+
+	# Determine the upstream_url
+	upstream_url=$(git config --get remote.origin.url)
+}
+
+test -z $upstream_url &&
+die "fatal: $link_directory does not have a configured upstream remote origin."
+cat >>"$link_spec" <<-\EOF
+upstream_url = $upstream_url
+EOF
+
+# Launch the editor
+git_editor "$link_spec" || die "$(gettext "Could not execute editor")"
+read_and_verify_link_spec
-- 
1.8.2.380.g0d4e79b