Change name of file use.sh to just use

1 files changed, 184 insertions, 0 deletions

diff --git a/use b/use
new file mode 100644
index 0000000..d0f962c
--- /dev/null
+++ b/use
@@ -0,0 +1,184 @@
+#!/bin/bash
+# This file is public domain.
+#
+# This is an interactive command line utility to handle scripts and
+# use cases (an use case is a scripts that opens everything needed for
+# the user to perform a task).
+#
+# In order to allow any programming language, your script must have
+# a sha-bang (#!) line. If you want it to start a GUI, you can use 
+# nohup in the command line. Using nohup in the sha-bang has the
+# potential unwanted effects of exploding (if you forget to put the
+# name of the shell after the word 'nohup') or scattering nohup.out
+# files all over the place (if you start it from different places),
+# so it's discouraged.
+#
+# The environment variables affecting this program are:
+#  $USE_DIR: The directory to store (and read) the scripts. By
+#    default, it is '~/.userc'.
+#  $EDITOR: The text editor to edit the scripts. By default, it is
+#    'nano'.
+#  $SHOW: The default command to show the scripts (not editing). By
+#    default, it is 'less' (you can use cat, nano...).
+
+
+# Normalize environment variables.
+USE_DIR=${USE_DIR:-~/.userc}
+[ "$USE_DIR" != / ] && USE_DIR=${USE_DIR%/}
+
+EDITOR=${EDITOR:-nano}
+SHOW=${SHOW:-less}
+
+# If if doesn't exist, create it if possible.
+if [ ! -d "$USE_DIR" ]; then
+	if [ -e "$USE_DIR" ]; then
+		echo "$0: $USE_DIR: Not a directory."
+		exit
+	elif mkdir -p "$USE_DIR"; then
+		echo "$0: Created directory '$USE_DIR'."
+	else
+		exit
+	fi
+fi
+
+# Check read/list permissions.
+if [ ! -r "$USE_DIR" -o ! -x "$USE_DIR" ]; then
+	echo "$0: $USE_DIR: Unable to access directory contents."
+	exit
+fi
+
+cd "$USE_DIR"
+
+# Functions
+user_wait() {
+	echo -n "Press any key to continue..."
+	read
+}
+
+error_ro() {
+	echo "$0: $USE_DIR: Read-only directory."
+	user_wait
+}
+
+read_num () {
+	echo -n "Script number: "
+	read num
+	while [ -z "${use[num]}" ]; do
+		[ -z "$num" ] && return 0
+		echo "$0: Invalid number."
+		echo -n "Script number: "
+		read num
+	done
+	return 0
+}
+
+new_script () {
+	if $writable; then
+		echo -n "Name: "
+		read name
+		[ -z "$name" ] && return 0
+		touch "$name"
+		chmod +x "$name"
+		$EDITOR "$name"
+	else
+		error_ro
+	fi
+}
+
+delete_script () {
+	if $writeable; then
+		read_num
+		rm "${use[num]}"
+	else
+		error_ro
+	fi
+}
+
+edit_script () {
+	read_num
+	while [ ! -w "${use[num]}" ]; do
+		echo "$0: ${use[num]}: Read-only file."
+		read_num
+	done
+	$EDITOR "${use[num]}"
+}
+		
+
+rename_script () {
+	if $writeable; then
+		read_num
+		echo -n "New name: "
+		read name
+		[ -z "$name" ] && return 0
+		mv "${use[num]}" "$name"
+	else
+		error_ro
+	fi
+}
+		
+show_script () {
+	read_num
+	$SHOW "${use[num]}"
+}
+
+		
+# Menu
+menu () {
+	clear
+
+	# Check write permission.
+	if [ -w "$USE_DIR" ]; then
+		writeable=true
+	else
+		echo "NOTE: Running in read-only mode."
+		writeable=false
+	fi
+
+	# Get directory contents
+	typeset -i cnt=0
+	use[0]=""
+	for f in *; do
+		if [ -f "$f" -a -x "$f" ]; then
+			cnt=cnt+1
+			use[cnt]=$f
+		fi
+	done	
+
+	# Start listing options
+	if $writeable; then
+		echo " n) New script"
+		echo " d) Delete script"
+		echo " r) Rename script"
+	fi
+
+	echo " e) Edit script"
+	echo " s) Show script"
+
+	for i in `seq $cnt`; do
+		echo -n " $i) ${use[i]}"
+		[ ! -w "${use[i]}" ] && echo -n " (read only)"
+		echo
+	done
+
+	# Ask
+	echo
+	echo -n "Choose an option: "
+	read opt
+
+	case $opt in
+	n|N) new_script ;;
+	d|D) delete_script ;;
+	e|E) edit_script ;;
+	r|R) rename_script ;;
+	s|S) show_script ;;
+	*)
+		if [ -n "${use[opt]}" ]; then
+			"$USE_DIR/${use[opt]}"
+			exit
+		fi
+	esac
+}
+
+while true; do
+	menu
+done