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259 lines
9.5 KiB
Bash
259 lines
9.5 KiB
Bash
[[ -o interactive ]] || return
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zmodload zsh/datetime || return
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# Retrives status of a git repo from a directory under its working tree.
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#
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# -d STR Directory to query. Defaults to $PWD. Must be absolute.
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# -c STR Callback function to call once the results are available. Called only after
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# gitstatus_query returns 0 with VCS_STATUS_RESULT=tout.
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# -t FLOAT Timeout in seconds. Will block for at most this long. If no results are
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# available by then: if -c isn't specified, will return 1; otherwise will set
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# VCS_STATUS_RESULT=tout and return 0.
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#
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# On success sets VCS_STATUS_RESULT to one of the following values:
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#
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# tout Timed out waiting for data; will call the user-specified callback later.
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# norepo-sync The directory isn't a git repo.
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# ok-sync The directory is a git repo.
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#
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# When the callback is called VCS_STATUS_RESULT s set to one of the following values:
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#
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# norepo-async The directory isn't a git repo.
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# ok-async The directory is a git repo.
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#
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# If VCS_STATUS_RESULT is ok-sync or ok-async, additional variables are set:
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#
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# VCS_STATUS_LOCAL_BRANCH Local branch name. Not empty.
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# VCS_STATUS_REMOTE_BRANCH Upstream branch name. Can be empty.
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# VCS_STATUS_REMOTE_URL Remote URL. Can be empty.
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# VCS_STATUS_ACTION Repository state, A.K.A. action. Can be empty.
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# VCS_STATUS_HAS_STAGED 1 if there are staged changes, 0 otherwise.
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# VCS_STATUS_HAS_UNSTAGED 1 if there are unstaged changes, 0 if there aren't, -1 if unknown.
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# VCS_STATUS_HAS_UNTRACKED 1 if there are untracked files, 0 if there aren't, -1 if unknown.
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# VCS_STATUS_COMMITS_AHEAD Number of commits the current branch is ahead of upstream.
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# Non-negative integer.
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# VCS_STATUS_COMMITS_BEHIND Number of commits the current branch is behind upstream. Non-negative
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# integer.
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# VCS_STATUS_STASHES Number of stashes. Non-negative integer.
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# VCS_STATUS_WORKDIR Git repo working directory. Not empty.
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# VCS_STATUS_ALL All of the above in an array. The order of elements is unspecified.
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# More elements can be added in the future.
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#
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# The point of reporting -1 as unstaged and untracked is to allow the command to skip scanning
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# files in large repos. See -m flag of gitstatus_start.
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#
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# !!!!! WARNING: CONCURRENT CALLS WITH THE SAME NAME ARE NOT ALLOWED !!!!!
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#
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# It's illegal to call `gitstatus_query NAME` if `gitstatus_query NAME` is running concurrently in
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# the same interactive shell or its child, or if the callback for the last timed out request hasn't
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# fired yet. If you need to issue concurrent requests, use different NAME arguments.
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function gitstatus_query() {
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emulate -L zsh
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setopt err_return no_unset
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local opt
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local dir=$PWD
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local callback=''
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local -F timeout=-1
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while true; do
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getopts "d:c:t:" opt || break
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case $opt in
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d) dir=$OPTARG;;
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c) callback=$OPTARG;;
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t) timeout=$OPTARG;;
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?) return 1;;
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done) break;;
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esac
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done
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(( OPTIND == ARGC )) || { echo "usage: gitstatus_query [OPTION]... NAME" >&2; return 1 }
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local name=${*[$OPTIND]}
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[[ -v GITSTATUS_DAEMON_PID_${name} ]]
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local -i req_fd
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local req_fd_var=_GITSTATUS_REQ_FD_${name}
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local client_pid_var=_GITSTATUS_CLIENT_PID_${name}
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[[ ${(P)client_pid_var} == $$ ]] && {
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req_fd=${(P)req_fd_var}
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} || {
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local req_fifo_var=_GITSTATUS_REQ_FIFO_${name}
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local resp_fifo_var=_GITSTATUS_RESP_FIFO_${name}
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local resp_fd_var=_GITSTATUS_RESP_FD_${name}
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local -i resp_fd
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exec {req_fd}<>${(P)req_fifo_var}
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exec {resp_fd}<>${(P)resp_fifo_var}
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typeset -g $client_pid_var=$$
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typeset -g $req_fd_var=$req_fd
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typeset -g $resp_fd_var=$resp_fd
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typeset -giH $client_pid_var=$client_pid
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typeset -gfH _gitstatus_process_response_${name}() {
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_gitstatus_process_response ${0#_gitstatus_process_response_} 0 ''
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}
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zle -F $resp_fd _gitstatus_process_response_${name}
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}
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local -r req_id="$EPOCHREALTIME"
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echo -nE "${req_id} ${callback}"$'\x1f'"${dir}"$'\x1e' >&$req_fd
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while true; do
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_gitstatus_process_response $name $timeout $req_id
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[[ $VCS_STATUS_RESULT == *-async ]] || break
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done
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[[ $VCS_STATUS_RESULT != tout || -n $callback ]]
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}
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typeset -fH _gitstatus_process_response() {
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emulate -L zsh
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setopt err_return no_unset
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local name=$1
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local -F timeout=$2
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local req_id=$3
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local resp_fd_var=_GITSTATUS_RESP_FD_${name}
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typeset -ga VCS_STATUS_ALL
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typeset -g VCS_STATUS_RESULT
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(( timeout >= 0 )) && local -a t=(-t $timeout) || local -a t=()
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IFS=$'\x1f' read -rd $'\x1e' -u ${(P)resp_fd_var} $t -A VCS_STATUS_ALL || {
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VCS_STATUS_RESULT=tout
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unset VCS_STATUS_ALL
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return
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}
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local -a header=("${(@Q)${(z)VCS_STATUS_ALL[1]}}")
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[[ ${header[1]} == $req_id ]] && local -i ours=1 || local -i ours=0
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shift header
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[[ ${VCS_STATUS_ALL[2]} == 1 ]] && {
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shift 2 VCS_STATUS_ALL
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(( ours )) && VCS_STATUS_RESULT=ok-sync || VCS_STATUS_RESULT=ok-async
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typeset -g VCS_STATUS_LOCAL_BRANCH="${VCS_STATUS_ALL[1]}"
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typeset -g VCS_STATUS_REMOTE_BRANCH="${VCS_STATUS_ALL[2]}"
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typeset -g VCS_STATUS_REMOTE_URL="${VCS_STATUS_ALL[3]}"
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typeset -g VCS_STATUS_ACTION="${VCS_STATUS_ALL[4]}"
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typeset -gi VCS_STATUS_HAS_STAGED="${VCS_STATUS_ALL[5]}"
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typeset -gi VCS_STATUS_HAS_UNSTAGED="${VCS_STATUS_ALL[6]}"
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typeset -gi VCS_STATUS_HAS_UNTRACKED="${VCS_STATUS_ALL[7]}"
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typeset -gi VCS_STATUS_COMMITS_AHEAD="${VCS_STATUS_ALL[8]}"
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typeset -gi VCS_STATUS_COMMITS_BEHIND="${VCS_STATUS_ALL[9]}"
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typeset -gi VCS_STATUS_STASHES="${VCS_STATUS_ALL[10]}"
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typeset -g VCS_STATUS_WORKDIR="${VCS_STATUS_ALL[11]}"
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} || {
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(( ours )) && VCS_STATUS_RESULT=norepo-sync || VCS_STATUS_RESULT=norepo-async
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unset VCS_STATUS_ALL
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unset VCS_STATUS_LOCAL_BRANCH
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unset VCS_STATUS_REMOTE_BRANCH
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unset VCS_STATUS_REMOTE_URL
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unset VCS_STATUS_ACTION
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unset VCS_STATUS_HAS_STAGED
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unset VCS_STATUS_HAS_UNSTAGED
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unset VCS_STATUS_HAS_UNTRACKED
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unset VCS_STATUS_COMMITS_AHEAD
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unset VCS_STATUS_COMMITS_BEHIND
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unset VCS_STATUS_STASHES
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unset VCS_STATUS_WORKDIR
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}
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(( ! ours )) && (( #header )) && emulate -L zsh && "${header[@]}" || true
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}
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# Usage: gitstatus_start [OPTION]... NAME
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#
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# -t FLOAT Fail the self-check on initialization if not getting a response from gitstatusd for
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# this this many seconds. Defaults to 5.
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# -m INT Report -1 unstaged and untracked if there are more than this many files in the index.
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# Negative value means infinity. Defaults to -1.
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function gitstatus_start() {
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emulate -L zsh
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setopt err_return no_unset
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unsetopt bg_nice
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local opt
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local -F timeout=5
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local -i max_dirty=-1
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while true; do
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getopts "t:m:" opt || break
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case $opt in
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t) timeout=$OPTARG;;
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m) max_dirty=$OPTARG;;
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?) return 1;;
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done) break;;
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esac
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done
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(( timeout > 0 )) || { echo "invalid -t: $timeout" >&2; return 1 }
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(( OPTIND == ARGC )) || { echo "usage: gitstatus_start [OPTION]... NAME" >&2; return 1 }
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local name=${*[$OPTIND]}
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[[ ! -v GITSTATUS_DAEMON_PID_${name} ]] || return 0
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function gitstatus_arch() {
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local kernel && kernel=$(uname -s) && [[ -n $kernel ]]
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local arch && arch=$(uname -m) && [[ -n $arch ]]
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echo -E "${kernel:l}-${arch:l}"
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}
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local daemon && daemon=${GITSTATUS_DAEMON:-${${(%):-%x}:A:h}/bin/gitstatusd-$(gitstatus_arch)}
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[[ -f $daemon ]] || { echo "file not found: $daemon" >&2 && return 1 }
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local req_fifo resp_fifo log
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local -i req_fd resp_fd daemon_pid
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function start() {
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req_fifo=$(mktemp -u "${TMPDIR:-/tmp}"/gitstatus.$$.pipe.req.XXXXXXXXXX)
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resp_fifo=$(mktemp -u "${TMPDIR:-/tmp}"/gitstatus.$$.pipe.resp.XXXXXXXXXX)
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mkfifo $req_fifo
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mkfifo $resp_fifo
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exec {req_fd}<>$req_fifo
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exec {resp_fd}<>$resp_fifo
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typeset -gfH _gitstatus_process_response_${name}() {
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_gitstatus_process_response ${0#_gitstatus_process_response_} 0 ''
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}
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zle -F $resp_fd _gitstatus_process_response_${name}
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log=$(mktemp "${TMPDIR:-/tmp}"/gitstatus.$$.log.XXXXXXXXXX)
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# We use `zsh -c` instead of plain {} or () to work around bugs in zplug. It hangs on startup.
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zsh -c "
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${(q)daemon} --dirty-max-index-size=${(q)max_dirty} --parent-pid=$$
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echo -nE $'bye\x1f0\x1e'
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rm -f ${(q)req_fifo} ${(q)resp_fifo}
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" <&$req_fd >&$resp_fd 2>$log &!
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daemon_pid=$!
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local reply
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echo -nE $'hello\x1f\x1e' >&$req_fd
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IFS='' read -r -d $'\x1e' -u $resp_fd -t $timeout reply
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[[ $reply == $'hello\x1f0' ]]
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}
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start && {
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typeset -g GITSTATUS_DAEMON_LOG_${name}=$log
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typeset -gi GITSTATUS_DAEMON_PID_${name}=$daemon_pid
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typeset -gH _GITSTATUS_REQ_FIFO_${name}=$req_fifo
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typeset -gH _GITSTATUS_RESP_FIFO_${name}=$resp_fifo
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typeset -giH _GITSTATUS_REQ_FD_${name}=$req_fd
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typeset -giH _GITSTATUS_RESP_FD_${name}=$resp_fd
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typeset -giH _GITSTATUS_CLIENT_PID_${name}=$$
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} || {
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echo "gitstatus failed to initialize" >&2
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[[ -n $daemon_pid ]] && kill $daemon_pid &>/dev/null || true
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[[ -n $req_fd ]] && exec {req_fd}>&- || true
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[[ -n $resp_fd ]] && { zle -F $resp_fd || true } && { exec {resp_fd}>&- || true}
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rm -f $req_fifo $resp_fifo
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return 1
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}
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}
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# Usage: gitstatus_check NAME.
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#
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# Returns 0 if and only if `gitstatus_start NAME` has succeeded previously.
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# If it returns non-zero, gitstatus_query NAME is guaranteed to return non-zero.
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function gitstatus_check() {
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local name=$1
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[[ -v GITSTATUS_DAEMON_PID_${name} ]]
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}
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