mirror of
https://github.com/notwa/rc
synced 2024-11-12 16:09:04 -08:00
348 lines
11 KiB
Bash
Executable file
348 lines
11 KiB
Bash
Executable file
#!/usr/bin/env dash
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# YES_ZSH YES_BASH YES_DASH YES_ASH
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# fuck termcap, all my homies hate termcap.
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glug() ( # note the subshell syntax. this allows us to abuse globals like crazy.
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[ $# = 0 ] || { printf '%s does not take arguments.\n' glug >&2; return 2; }
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_here="$PWD"
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repo="$PWD"
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i=0
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while ! [ -d .git ] 2>/dev/null; do
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# no one has git repositories with directories deeper than 10 levels, right?
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[ $((i+=1)) -lt 10 ] || { printf '%s: failed to find a .git directory\n' glug >&2; return 2; }
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cd ..
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repo="$PWD"
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done
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cd "$_here"
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detect_size() {
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# globals: $COLUMNS, $LINES
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_size="$(stty size)"
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COLUMNS="${_size#* }"
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LINES="${_size%% *}"
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if [ "$COLUMNS" -gt 0 ] 2>/dev/null && [ "$LINES" -gt 0 ] 2>/dev/null; then
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: # pass
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else
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printf '%s: failed to determine terminal size\n' glug >&2
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return 2
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fi
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unset _size
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}
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[ -n "$ZSH_VERSION" ] || detect_size
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if [ -n "$ZSH_VERSION" ] || [ -n "$BASH_VERSION" ]; then
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esc=$'\e'
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nl=$'\n'
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cr=$'\r'
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else
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esc="$(printf '\033')"
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# shells strip trailing newlines from captures, so work around that:
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nl="$(printf '\nx')"; nl="${nl%x}"
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cr="$(printf '\rx')"; cr="${cr%x}"
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fi
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limit=200 # maximum number of git commits to look back on
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choices=0
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selection=1
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alt=0
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ret=0
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err=
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alt_on() {
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# globals: $alt
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printf '\033[?1049h' # alt screen on (smcup)
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alt=1
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printf '\033[?1h\033=' # no idea but less does it so it must be important (smkx)
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printf '\r' # move cursor to start of line (carriage return)
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printf '\033[H' # move cursor to first line
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}
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alt_off() {
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# globals: $alt
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printf '\r' # move cursor to start of line (carriage return)
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#printf '\033[K' # erase everything after the cursor (el)
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printf '\033[?1l\033>' # no idea but less does it so it must be important (rmkx)
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printf '\033[?1049l' # alt screen off (rmcup)
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alt=0
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}
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glug_enter() {
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# globals: $alt
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[ $alt = 1 ] || alt_on
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}
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glug_exit() {
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# globals: $alt, $err, $ret
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[ $alt = 0 ] || alt_off
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[ -z "$err" ] || printf '%s\n' "$err" >&2
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exit $ret
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}
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die() {
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# globals: $ret, $err
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ret=$?
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err="$@"
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[ $? = 0 ] && exit 1 || exit $?
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}
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read_byte() {
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# NOTE: run this function in a subshell, else everything will blow up.
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old="$(stty -g)"
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trap 'stty "$old"' INT EXIT
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stty -icanon -echo
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dd ibs=1 count=1 2>/dev/null || exit
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echo _ # append an underscore so that newlines are preserved in captures
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} </dev/tty # ensure this interacts with a terminal instead of a pipe
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escape_message() {
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# arguments: $message
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_msg=
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while _seg="${message%%\'*}"; [ "$_seg" != "$message" ]; do
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_msg="$_msg$_seg'\''"
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message="${message#*\'}"
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done
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message="$_msg$message"
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unset _msg _seg
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}
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parse_logs() {
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# arguments: $logs (clobbered)
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# globals: $choices
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logs="$logs$nl" # otherwise the last entry is dropped
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while _next="${logs#*$nl}"; [ "$logs" != "$_next" ]; do
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_line="${logs%%$nl*}"
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#_line="${logs%$cr}" # TODO: handle this more robustly.
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logs="$_next"
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commit="${_line%% *}"
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[ -z "${commit##[a-f0-9]*}" ] || die "invalid commit: $commit"
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message="${_line#* }"
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escape_message
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#printf '~%s~\n' "$_line"
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#printf 'COMMIT="%s"; MESSAGE="%s";\n' "$commit" "$message"
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: $((choices+=1))
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eval "choice_$choices=$commit"
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eval "commit_$commit='$message'"
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done
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unset _line _next
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}
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colorize_pathy() {
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# arguments: $pathy (clobbered)
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printf '%s' "$pathy" # TODO
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}
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colorize_diffy() {
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# arguments: $diffy (clobbered)
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while [ -n "$diffy" ]; do
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if [ "${diffy#[!0-9+-]}" != "$diffy" ]; then
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_seg="${diffy%%[0-9+-]*}"
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printf '\033[m ' # NOTE: this replaces *all* unexpected characters.
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elif [ "${diffy#[0-9]}" != "$diffy" ]; then
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_seg="${diffy%%[!0-9]*}"
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printf '\033[97m%4s' "$_seg"
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elif [ "${diffy#+}" != "$diffy" ]; then
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_seg="${diffy%%[!+]*}"
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printf '\033[92m%s' "$_seg"
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elif [ "${diffy#-}" != "$diffy" ]; then
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_seg="${diffy%%[!-]*}"
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printf '\033[91m%s' "$_seg"
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else
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break # unreachable
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fi
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diffy="${diffy#$_seg}"
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done
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unset _seg
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}
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colorize_summary() {
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# arguments: $gds (clobbered)
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_color=33
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[ "${gds%insertion*}" = "$gds" ]; _ins=$? # _ins=1 when insertion is found
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while [ -n "$gds" ]; do
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if [ "${gds#[!(),0-9+-]}" != "$gds" ]; then
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_seg="${gds%%[(),0-9+-]*}"
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printf '\033[%sm%s' "$_color" "$_seg"
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elif [ "${gds#[()+-]}" != "$gds" ]; then
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_seg="${gds%%[!()+-]*}"
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case "$_seg" in
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('(+)') printf '\033[m(\033[92m+\033[m)';;
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('(-)') printf '\033[m(\033[91m-\033[m)';;
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(*) printf '%s' "$_seg";;
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esac
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elif [ "${gds#,}" != "$gds" ]; then
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_seg="${gds%%[!,]*}"
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printf '\033[%sm%s' "$_color" "$_seg"
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: $((_color-=1)) # how convenient that the color codes line up!
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[ $_ins = 1 ] || : $((_color-=1)) # no insertions; skip to red
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elif [ "${gds#[0-9]}" != "$gds" ]; then
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_seg="${gds%%[!0-9]*}"
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printf '\033[97m%s' "$_seg"
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else
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break # unreachable
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fi
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gds="${gds#$_seg}"
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done
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unset _color _ins _seg
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}
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format_stats() {
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# arguments: $gds (clobbered)
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# globals: $linesleft
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[ $linesleft -gt 1 ] || return
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while _line="${gds%%$nl*}"; [ "$_line" != "$gds" ]; do
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gds="${gds#*$nl}"
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[ $linesleft -gt 1 ] || continue
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# NOTE: assumes no filepaths contain a '|' character.
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pathy="${_line%|*}"
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diffy="${_line#*|}"
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colorize_pathy
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printf '\033[m|'
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colorize_diffy
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unset pathy diffy
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printf '\033[m\n'
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: $((linesleft-=1))
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done
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colorize_summary
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printf '\n'
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: $((linesleft-=1))
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unset _line
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}
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present_choices() {
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# arguments: $selection
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# globally influential: $choices
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linesleft=$LINES
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i=$((selection-2))
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while [ $((i+=1)) -le $choices ]; do
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if [ $i -eq 0 ]; then
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printf '%s\n' 'welcome to glug!' # TODO: make this pretty. print cwd?
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: $((linesleft-=1))
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continue
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elif [ $i -lt 0 ]; then
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printf '\n'
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: $((linesleft-=1))
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continue
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fi
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eval "commit=\$choice_$i"
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eval "message=\$commit_$commit"
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if [ $i = $selection ]; then
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#printf ' \033[95m >\033[m \033[33m%s\033[m ' "$commit"
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printf ' \0337 \033[7m>\033[m \033[33m%s\033[m ' "$commit"
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else
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printf ' \033[90m%s\033[m ' "$commit"
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fi
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# TODO: truncate message as necessary.
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printf '%s\n' "$message"
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: $((linesleft-=1))
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if [ $i = $selection ]; then
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gds="$(git diff --stat "$commit~" "$commit" --)"
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if [ $? = 0 ]; then
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: $((linesleft-=2)) # reserve two lines for present_choices
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format_stats
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: $((linesleft+=2)) # ...
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else
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printf ' \033[91merror:\033[31m failed to run `git diff --stat`\n'
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: $((linesleft-=1))
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fi
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fi
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[ $linesleft -ge 2 ] || break
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done
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if [ $linesleft -ge 1 ]; then
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printf '\033[%s;0H' $LINES
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linesleft=1
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printf ' \033[33m(\033[97m%s\033[33m/\033[97m%s\033[33m)\033[m ' "$selection" "$choices"
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: $((linesleft-=1))
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fi
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eval "commit=\$choice_$selection" # set $commit to something useful
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}
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handle_input() {
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# globals: $dirty
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# TODO: handle escape codes (especially arrow keys, page up/down)
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# TODO: reset button that checks LINES and COLUMNS again.
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printf '\0338' # restore cursor to prompt position (rc)
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input="$(read_byte)" || return
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if [ "${input%_}" = "$input" ]; then
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# no magic underscore, something went wrong.
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return 1
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else
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input="${input%_}"
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fi
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while [ -n "$input" ]; do
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# replace newlines with spaces for my own sanity.
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# of course, this makes spaces act the same as newlines.
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if [ "${input#$nl}" != "$input" ]; then
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input=" ${input#$nl}"
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fi
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if [ "${input#[! gGjkq]}" != "$input" ]; then
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_seg="${input%%[ gGjkq]*}"
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elif [ "${input# }" != "$input" ]; then
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_seg=' '
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alt_off
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git diff "$commit~" "$commit" -- || exit
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alt_on
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dirty=1
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elif [ "${input#g}" != "$input" ]; then
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_seg=g
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[ $selection = 1 ] || dirty=1
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selection=1
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elif [ "${input#G}" != "$input" ]; then
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_seg=G
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[ $selection = $choices ] || dirty=1
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selection=$choices
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elif [ "${input#j}" != "$input" ]; then
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_seg=j
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[ $selection = $choices ] || dirty=1
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[ $((selection+=1)) -le $choices ] || selection=$choices
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elif [ "${input#k}" != "$input" ]; then
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_seg=k
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[ $selection = 1 ] || dirty=1
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[ $((selection-=1)) -ge 1 ] || selection=1
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elif [ "${input#q}" != "$input" ]; then
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_seg=q
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dirty=0 # stop redrawing and just get outta here
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return 1
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else
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break # unreachable
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fi
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input="${input#$_seg}"
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done
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unset _seg
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}
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trap glug_exit INT EXIT && glug_enter
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# TODO: invoke git with --no-config or whatever?
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# TODO: --decorate=full, and color it.
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logs="$(git log --oneline --first-parent -n $limit 2>&1)" || die "$logs"
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parse_logs
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[ $choices -gt 0 ] || { printf '%s: no commits\n' >&2; return 2; }
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present_choices
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dirty=0
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while handle_input; do
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if [ $dirty = 1 ]; then
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printf '\r' # move cursor to start of line (carriage return)
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printf '\033[H' # move cursor to first line
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printf '\033[J' # clear the rest of the screen
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present_choices
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dirty=0
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fi
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done
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) 1<>/dev/tty <&1 # ensure this interacts with a terminal instead of a pipe
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[ -n "${preload+-}" ] || glug "$@"
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