lib/dir.sh: New file

2 files changed, 47 insertions, 0 deletions

diff --git a/lib/dir.sh b/lib/dir.sh
new file mode 100644
index 0000000..f6b6710
--- /dev/null
+++ b/lib/dir.sh
@@ -0,0 +1,46 @@
+# Miscellaneous directory-related functions
+#
+# Copyright (C) 2013  Patrick "P. J." McDermott
+#
+# This file is part of the ProteanOS Development Kit.
+#
+# The ProteanOS Development Kit is free software: you can redistribute
+# it and/or modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# The ProteanOS Development Kit is distributed in the hope that it
+# will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with the ProteanOS Development Kit.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+[ "x${_DIR_SM+set}" = 'xset' ] && return 0
+_DIR_SM=1
+
+dir_is_empty()
+{
+	local dir="${1}"
+	local ret=
+	local dirent=
+
+	ret=0
+
+	# Patterns to match all dirents except "." and "..":
+	#   *      dirents whose names don't start with "."
+	#   .[!.]  dirents whose names start with ".", are two characters long,
+	#          and aren't ".."
+	#   .??*   dirents whose names start with "." and are three or more
+	#          characters long
+	for dirent in "${dir}/"* "${dir}/".[!.] "${dir}/".[!.] "${dir}/".??*; do
+		if [ -e "${dirent}" ]; then
+			ret=1
+			break
+		fi
+	done
+
+	return ${ret}
+}
diff --git a/lib/local.mk b/lib/local.mk
index f87ab10..1ce768c 100644
--- a/lib/local.mk
+++ b/lib/local.mk
@@ -3,6 +3,7 @@ pkgdata_sources = \
 	lib/locale.sh \
 	lib/getopt.sh \
 	lib/fd.sh \
+	lib/dir.sh \
 	lib/archplat.sh \
 	lib/deps.sh \
 	lib/substvars.sh \