mirror of
https://github.com/notwa/rc
synced 2024-11-05 02:59:03 -08:00
63 lines
1.7 KiB
Bash
Executable file
63 lines
1.7 KiB
Bash
Executable file
#!/usr/bin/env sh
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# YES_ZSH
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# YES_BASH
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# YES_DASH
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# YES_ASH
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### @ confirm
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### display a simple yes-or-no prompt and return 0-or-1 respectively.
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###
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### ```
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### $ confirm && echo yay || echo nay
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### Continue? [y/N] y
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### yay
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### $ confirm && echo yay || echo nay
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### Continue? [y/N] n
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### nay
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### ```
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###
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### a real world example:
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###
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### ```
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### $ g1 && confirm && git commit -a --amend --no-edit
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### daf84e3 document a ton of stuff
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### Continue? [y/N] y
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### [master 92bdf76] document a ton of stuff
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### Date: Sun Aug 1 09:27:25 2021 -0700
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### 20 files changed, 406 insertions(+), 29 deletions(-)
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### ```
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# known inconsistencies:
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# since the fallbacks pipe stderr into stdin,
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# this will behave differently between zsh and non-zsh shells:
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# ( echo hi | confirm | wc -c ) 2>/dev/null
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if [ -n "$ZSH_VERSION" ]; then
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confirm() {
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[ $# -le 0 ] || { printf "%s\n" "$0: too many arguments" >&2; return 2; }
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read -q '?Continue? [y/N] '
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ret=$?
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echo >/dev/tty
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return $ret
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}
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elif [ -n "$BASH_VERSION" ]; then
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confirm() {
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[ $# -le 0 ] || { printf "%s\n" "$0: too many arguments" >&2; return 2; }
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read -n1 -p "Continue? [y/N] " c
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echo
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[ "$c" = y ] || [ "$c" = Y ]
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} <&2 >/dev/tty # try to ensure this is a terminal instead of a pipe
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else
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confirm() (
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[ $# -le 0 ] || { printf "%s\n" "$0: too many arguments" >&2; return 2; }
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old="$(stty -g)"
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trap 'stty "$old"' INT EXIT
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printf 'Continue? [y/N] '
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stty -icanon
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c="$(dd ibs=1 count=1 2>/dev/null)"
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echo
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[ "$c" = y ] || [ "$c" = Y ]
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) <&2 >/dev/tty # try to ensure this is a terminal instead of a pipe
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fi
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[ -n "${preload+-}" ] || confirm "$@"
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