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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
e [FILE]
e -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help
Flexibly run a text editor, either directly on in a pipe.
Examples:
Edit "file.txt":
$ e file.txt
Manipulate the content of a pipe midway:
$ seq 10 | e | grep 5
The editor used is either $VISUAL or $EDITOR, with a fallback to
vi in case any of those variables aren't defined.
EOF
}
for flag in "$@"; do
case "$flag" in
--)
break
;;
--help)
usage
help
exit
;;
*)
;;
esac
done
while getopts 'h' flag; do
case "$flag" in
h)
usage
help
exit
;;
*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
CMD="${VISUAL:-${EDITOR:-vi}}"
if [ ! -t 0 ]; then
F="$(mkstemp)"
cat > "$F"
exec 0</dev/tty
exec 3>&1
exec 1>/dev/tty
$CMD "$F"
cat "$F" >&3
else
$CMD "$@"
fi
|
