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stdin support, added optional highlight(1) dependency

This commit is contained in:
Emma Tebibyte 2024-04-18 11:50:20 -06:00
parent 4f0788048b
commit 41b0293d42
Signed by: emma
GPG Key ID: 06FA419A1698C270
1 changed files with 21 additions and 34 deletions
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55
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@ -7,15 +7,17 @@
# permitted in any medium without royalty provided the copyright notice and this
# notice are preserved. This file is offered as-is, without any warranty.
if test -z "$1"; then
printf "Usage: %s file...\n" "$0" 1>&2
exit 64 # sysexits.h(3) EX_USAGE
if command -v highlight >/dev/null 2>&1
then
HIGHLIGHT_OPTIONS='--out-format=ansi'; export HIGHLIGHT_OPTIONS
else
alias highlight=cat
fi
if ! command -v mktemp >/dev/null 2>&1
then
printf "%s: mktemp(1): missing dependency" "$0"
exit 69 # sysexits.h(3) EX_UNAVAILABLE
if test -z "$1"; then
set -- /dev/stdin
HIGHLIGHT_OPTIONS="$HIGHLIGHT_OPTIONS --syntax=none"
export HIGHLIGHT_OPTIONS
fi
help="$(printf "Commands:\n\
@ -25,30 +27,17 @@ a – append a line to the current buffer\n\
c – clear the screen\n\
d – delete a line\n\
e – evaluate a command in the shell environment\n\
h – change syntax highlighting language\n\
i – insert a line into the buffer at position line\n\
p – print the current buffer\n\
q – terminate editing\n\
r – applie a regular expression to the current buffer\n\
r – apply a regular expression to the current buffer\n\
x – exit the program without writing output\n\
\n\
en(1) Copyright (c) 2023–2024 Emma Tebibyte\n")"
while test -n "$1"; do
content="$(cat "$1")"
file="$(printf "%s\n" "$1" | tr -d '/')"
temp_highlight="$(mktemp -t "XXXXX$file")"
# use bat for syntax highlighting if it’s available, but remove the frills
if command -v bat >/dev/null
then
# make bat use terminal theme
BAT_THEME=ansi; export BAT_THEME
# there has to be a temp file for writing the highlighted text to
syntax_h() {
printf "%s\n" "$1" >"$temp_highlight"
bat -pp --color always "$temp_highlight"
}
fi
while true; do
printf ">> " >/dev/tty
@ -66,7 +55,7 @@ while test -n "$1"; do
if test -z "$args"; then
printf "%s: %s\n" "$0" "$help"
else
printf "%s: command-specific help not implemented\n" "$0" 1>&2
printf "%s: %s: %s invalid argument\n" "$0" "$command" "$args" 1>&2
continue
fi
;;
@ -78,9 +67,7 @@ while test -n "$1"; do
content="$(printf "%s\n%s" "$content" "$append")"
fi
;;
"c")
clear
;;
"c") clear ;;
"d")
if test -z "$args"; then
printf "%s: %s: Missing argument.\n" "$0" "$command" 1>&2
@ -95,22 +82,22 @@ while test -n "$1"; do
"e")
eval "$args" || true
;;
"h")
HIGHLIGHT_OPTIONS="$HIGHLIGHT_OPTIONS --syntax=$args"
export HIGHLIGHT_OPTIONS
;;
"i")
printf "%s: i: Command not implemented.\n" "$0" 1>&2
;;
"p")
out="$(syntax_h "$content" 2>/dev/null || printf "%s\n" "$content")"
printf "%s\n" "$out" | nl -ba >/dev/tty
;;
"q")
break
printf "%s\n" "$content" | highlight | nl -ba >/dev/tty
;;
"q") break ;;
"r")
content="$(printf "%s" "$content" | sed -e "$args")"
;;
"x")
exit
;;
"x") exit ;;
"") ;;
*)
printf "%s: %s: unrecognized command\n" "$0" "$command"
;;