bin/shesc: Add working utility

1 files changed, 92 insertions, 0 deletions

diff --git a/bin/shesc b/bin/shesc
new file mode 100644
index 0000000..40a72b7
--- /dev/null
+++ b/bin/shesc
@@ -0,0 +1,92 @@
+#!/bin/sh
+set -eu
+
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  shesc [CONTENT...]
+		  shesc -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+		Options:
+		  -h, --help    show this message
+
+		  CONTENT       a literal string to be escaped
+
+
+		Convert data to/from POSIX sh double quote string escaping.  If
+		CONTENT is not given, get data from STDIN.
+
+
+		Examples:
+
+		  Escape sh control characters in a string:
+
+		    $ printf 'content="%s"\n' "$(shesc '"string" $(dollar "`cmd`") \ ')"
+		    content="\"string\" \$(dollar \"\`cmd\`\") \\ "
+
+
+		  Escape the content from a file:
+
+		    $ shesc < file.conf
+	EOF
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+ENCODE=false
+DECODE=false
+while getopts 'edh' flag; do
+	case "$flag" in
+		e)
+			ENCODE=true
+			;;
+		d)
+			DECODE=true
+			;;
+		h)
+			usage
+			help
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+
+
+esc() {
+	sed 's|\([\\`"$]\)|\\\1|g'
+}
+
+
+if [ $# = 0 ]; then
+	esc
+else
+	for s in "$@"; do
+		printf '%s\n' "$s" | esc
+	done
+fi