initial prototype of 'git vendor add'

git-vendor.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+#
+# git-vendor.sh: manage vendored repos via git-subtree
+#
+# Copyright (C) 2016 Brett Langdon <me@brett.is>
+#
+if [ $# -eq 0 ];
+then
+    set -- -h
+fi
+
+OPTS_SPEC="\
+git vendor add <repository> <ref>
+git vendor list
+git vendor update <repository> <ref>
+--
+"
+eval "$(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"
+
+PATH=$PATH:$(git --exec-path)
+. git-sh-setup
+
+require_work_tree
+
+while [ $# -gt 0 ]; do
+	opt="$1"
+	shift
+	case "$opt" in
+		--) break ;;
+		*) die "Unexpected option: $opt" ;;
+	esac
+done
+
+command="$1"
+shift
+case "$command" in
+    add|list|update) ;;
+    *) die "Unknown command '$command'" ;;
+esac
+
+cmd_add()
+{
+    repository="$1"
+    ref="$2"
+    if [ $# -ne 2 ];
+    then
+        die "Incorrect options provided: git vendor add <repository> <ref>"
+    fi
+
+    dir="vendor/$(echo "$repository" | sed -E 's/^[a-zA-Z]+((:\/\/)|@)//' | sed 's/:/\//' | sed -E 's/\.git$//')"
+    message="\
+Add '$dir/' from '$repository $ref'
+
+git-subtree-repository: $repository
+git-subtree-ref: $ref
+"
+    git subtree add --prefix "$dir" --message "$message" "$repository" "$ref"
+}
+
+cmd_list()
+{
+    die "Not implemented"
+}
+
+cmd_update()
+{
+    die "Not implemented"
+}
+
+"cmd_$command" "$@"