157 lines
3.4 KiB
Bash
Executable file
157 lines
3.4 KiB
Bash
Executable file
#!/bin/bash
|
|
|
|
# tmux requires unrecognized OSC sequences to be wrapped with DCS tmux;
|
|
# <sequence> ST, and for all ESCs in <sequence> to be replaced with ESC ESC. It
|
|
# only accepts ESC backslash for ST. We use TERM instead of TMUX because TERM
|
|
# gets passed through ssh.
|
|
function print_osc() {
|
|
if [[ $TERM == screen* ]]; then
|
|
printf "\033Ptmux;\033\033]"
|
|
else
|
|
printf "\033]"
|
|
fi
|
|
}
|
|
|
|
# More of the tmux workaround described above.
|
|
function print_st() {
|
|
if [[ $TERM == screen* ]]; then
|
|
printf "\a\033\\"
|
|
else
|
|
printf "\a"
|
|
fi
|
|
}
|
|
|
|
function load_version() {
|
|
if [ -z ${IMGCAT_BASE64_VERSION+x} ]; then
|
|
IMGCAT_BASE64_VERSION=$(base64 --version 2>&1)
|
|
export IMGCAT_BASE64_VERSION
|
|
fi
|
|
}
|
|
|
|
function b64_encode() {
|
|
load_version
|
|
if [[ $IMGCAT_BASE64_VERSION =~ GNU ]]; then
|
|
# Disable line wrap
|
|
base64 -w0
|
|
else
|
|
base64
|
|
fi
|
|
}
|
|
|
|
function b64_decode() {
|
|
load_version
|
|
if [[ $IMGCAT_BASE64_VERSION =~ fourmilab ]]; then
|
|
BASE64ARG=-d
|
|
elif [[ $IMGCAT_BASE64_VERSION =~ GNU ]]; then
|
|
BASE64ARG=-di
|
|
else
|
|
BASE64ARG=-D
|
|
fi
|
|
base64 $BASE64ARG
|
|
}
|
|
|
|
# print_image filename inline base64contents print_filename
|
|
# filename: Filename to convey to client
|
|
# inline: 0 or 1
|
|
# base64contents: Base64-encoded contents
|
|
# print_filename: If non-empty, print the filename
|
|
# before outputting the image
|
|
function print_image() {
|
|
print_osc
|
|
printf '1337;File='
|
|
if [[ -n $1 ]]; then
|
|
printf "name=%s;" "$(printf "%s" "$1" | b64_encode)"
|
|
fi
|
|
|
|
printf "%s" "$3" | b64_decode | wc -c | awk '{printf "size=%d",$1}'
|
|
printf ";inline=%s" "$2"
|
|
printf ":"
|
|
printf "%s" "$3"
|
|
print_st
|
|
printf '\n'
|
|
if [[ -n $4 ]]; then
|
|
echo "$1"
|
|
fi
|
|
}
|
|
|
|
function error() {
|
|
echo "ERROR: $*" 1>&2
|
|
}
|
|
|
|
function show_help() {
|
|
echo "Usage: imgcat [-p] filename ..." 1>&2
|
|
echo " or: cat filename | imgcat" 1>&2
|
|
}
|
|
|
|
function check_dependency() {
|
|
if ! (builtin command -V "$1" >/dev/null 2>&1); then
|
|
echo "imgcat: missing dependency: can't find $1" 1>&2
|
|
exit 1
|
|
fi
|
|
}
|
|
|
|
## Main
|
|
|
|
if [ -t 0 ]; then
|
|
has_stdin=f
|
|
else
|
|
has_stdin=t
|
|
fi
|
|
|
|
# Show help if no arguments and no stdin.
|
|
if [ $has_stdin = f ] && [ $# -eq 0 ]; then
|
|
show_help
|
|
exit
|
|
fi
|
|
|
|
check_dependency awk
|
|
check_dependency base64
|
|
check_dependency wc
|
|
|
|
# Look for command line flags.
|
|
while [ $# -gt 0 ]; do
|
|
case "$1" in
|
|
-h | --h | --help)
|
|
show_help
|
|
exit
|
|
;;
|
|
-p | --p | --print)
|
|
print_filename=1
|
|
;;
|
|
-u | --u | --url)
|
|
check_dependency curl
|
|
encoded_image=$(curl -s "$2" | b64_encode) || (
|
|
error "No such file or url $2"
|
|
exit 2
|
|
)
|
|
has_stdin=f
|
|
print_image "$2" 1 "$encoded_image" "$print_filename"
|
|
set -- "${@:1:1}" "-u" "${@:3}"
|
|
if [ "$#" -eq 2 ]; then
|
|
exit
|
|
fi
|
|
;;
|
|
-*)
|
|
error "Unknown option flag: $1"
|
|
show_help
|
|
exit 1
|
|
;;
|
|
*)
|
|
if [ -r "$1" ]; then
|
|
has_stdin=f
|
|
print_image "$1" 1 "$(b64_encode <"$1")" "$print_filename"
|
|
else
|
|
error "imgcat: $1: No such file or directory"
|
|
exit 2
|
|
fi
|
|
;;
|
|
esac
|
|
shift
|
|
done
|
|
|
|
# Read and print stdin
|
|
if [ $has_stdin = t ]; then
|
|
print_image "" 1 "$(cat | b64_encode)" ""
|
|
fi
|
|
|
|
exit 0
|