lib/dir.sh: New file.

1 files changed, 69 insertions, 0 deletions

diff --git a/lib/dir.sh b/lib/dir.sh
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+# pro-archman
+# lib/dir.sh
+# Miscellaneous directory-related functions
+#
+# Copyright (C) 2013  Patrick "P. J." McDermott
+#
+# This program 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.
+#
+# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+hash_name()
+{
+	local name="${1}"
+	local hash=
+
+	if [ "x${name}" != "x${name#lib?}" ]; then
+		hash="$(printf '%s\n' "${name}" | sed 's/^\(lib.\).*$/\1/')"
+	else
+		hash="$(printf '%s\n' "${name}" | sed 's/^\(.\).*$/\1/')"
+	fi
+	printf '%s\n' "${hash}"
+
+	return 0
+}
+
+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 ${ret}
+}
+
+try_rmdir()
+{
+	local dir="${1}"
+
+	if dir_is_empty "${dir}"; then
+		rmdir "${dir}"
+		return ${?}
+	else
+		return 1
+	fi
+}