From 1236a4dcdd99dd3f8e528f02bc835227749b527b Mon Sep 17 00:00:00 2001
From: "Kyle J. McKay" <mackyle@gmail.com>
Date: Tue, 6 Feb 2018 05:18:42 -0800
Subject: [PATCH] shlib.sh: add v_get_proj_from_dir utility function

Various scripts attempt to translate a directory path
into a Girocco project.

Create a common shared function to do this safely and
avoid the code duplication.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
---
 shlib.sh | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/shlib.sh b/shlib.sh
index 8f12ba4..30935bf 100644
--- a/shlib.sh
+++ b/shlib.sh
@@ -590,6 +590,42 @@ get_repo_list() {
 	done
 }
 
+# set the variable named by the first argument to the project part (i.e. WITH
+# the trailing ".git" but WITHOUT the leading $cfg_reporoot) of the directory
+# specified by the second argument.
+# This function cannot be fooled by symbolic links.
+# If the second argument is omitted (or empty) use $(pwd -P) instead.
+# The directory specified by the second argument must exist.
+v_get_proj_from_dir() {
+	[ -n "$2" ] || set -- "$1" "$(pwd -P)"
+	[ -d "$2" ] || return 1
+	case "$2" in
+	"$cfg_reporoot/"?*)
+		# Simple case that does not need any fancy footwork
+		_projpart="${2#$cfg_reporoot/}"
+		;;
+	*)
+		_absrr="$(cd "$cfg_reporoot" && pwd -P)"
+		_abspd="$(cd "$2" && pwd -P)"
+		case "$_abspd" in
+		"$_absrr/"?*)
+			# The normal case
+			_projpart="${_abspd#$_absrr/}"
+			;;
+		*)
+			# Must have been reached via a symbolic link, but
+			# we have no way to know the source, so use a
+			# generic "_external" leader combined with just the
+			# trailing directory name
+			_abspd="${_abspd%/}"
+			_abspd="${_abspd%/.git}"
+			_projpart="_external/${_abspd##*/}"
+			;;
+		esac
+	esac
+	eval "$1="'"$_projpart"'
+}
+
 # Return success if the given project name has at least one immediate child fork
 # that has a non-zero length alternates file
 has_forks_with_alternates() {
-- 
2.11.4.GIT