shed

#!/bin/sh -e
#
# POSIX shell script equivalent of:
# <https://github.com/mplewis/shed>
#
# Usage: shed [SHELL_ARGUMENTS...]
#
# Executes stdin after you edit it.
# If $EDITOR is unset, uses $PAGER.
# If $PAGER  is unset, uses cat(1).
#
# To execute stdin with OTHER shell:
#
#   ln -s shed OTHERed
#   ln -s shed fished # fish shell
#   ln -s shed bashed # bash shell
#   ln -s shed zshed  # zsh shell
#   ln -s shed kshed  # ksh shell
#   ln -s shed cshed  # csh shell

# write stdin to a temporary file
temp=$(mktemp)
trap 'rm -f "$temp"' EXIT
trap 'exit' TERM INT
cat > "$temp"
exec 0</dev/tty

# edit or view the temporary file
${EDITOR:-${PAGER:-cat}} "$temp"

# confirm temporary file execution
printf 'Do you still want to execute this script? (yes/no): '
until read REPLY && echo "$REPLY" | grep -iq '^yes$'; do
  echo "$REPLY" | grep -iq '^no$' && exit
  printf 'Please respond with either "yes" or "no": '
done

# execute the temporary file
shell=$(basename "$0")
${shell%ed} "$@" "$temp"