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powerlevel10k/gitstatus/gitstatus.plugin.zsh
romkatv f90bf482a5 pull upstream changes from gitstatus
2019-04-30 14:17:55 +02:00

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# Copyright 2019 Roman Perepelitsa.
#
# This file is part of GitStatus. It provides ZSH bindings.
#
# GitStatus is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GitStatus is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
#
# ------------------------------------------------------------------
#
# Example: Start gitstatusd, send it a request, wait for response and print it.
#
# source gitstatus.plugin.zsh
# gitstatus_start MY
# gitstatus_query -d $PWD MY
# set | egrep '^VCS_STATUS'
#
# Output:
#
# VCS_STATUS_ACTION=''
# VCS_STATUS_COMMIT=6e86ec135bf77875e222463cbac8ef72a7e8d823
# VCS_STATUS_COMMITS_AHEAD=0
# VCS_STATUS_COMMITS_BEHIND=0
# VCS_STATUS_HAS_STAGED=0
# VCS_STATUS_HAS_UNSTAGED=1
# VCS_STATUS_HAS_UNTRACKED=1
# VCS_STATUS_LOCAL_BRANCH=master
# VCS_STATUS_REMOTE_BRANCH=master
# VCS_STATUS_REMOTE_NAME=origin
# VCS_STATUS_REMOTE_URL=git@github.com:romkatv/powerlevel10k.git
# VCS_STATUS_RESULT=ok-sync
# VCS_STATUS_STASHES=0
# VCS_STATUS_TAG=''
# VCS_STATUS_WORKDIR=/home/romka/.oh-my-zsh/custom/themes/powerlevel10k
[[ -o interactive ]] || return
autoload -Uz add-zsh-hook && zmodload zsh/datetime && zmodload zsh/system || return
# Retrives status of a git repo from a directory under its working tree.
#
## Usage: gitstatus_query [OPTION]... NAME
#
# -d STR Directory to query. Defaults to ${${GIT_DIR:-$PWD}:a}. Must be absolute.
# -c STR Callback function to call once the results are available. Called only after
# gitstatus_query returns 0 with VCS_STATUS_RESULT=tout.
# -t FLOAT Timeout in seconds. Will block for at most this long. If no results are
# available by then: if -c isn't specified, will return 1; otherwise will set
# VCS_STATUS_RESULT=tout and return 0.
#
# On success sets VCS_STATUS_RESULT to one of the following values:
#
# tout Timed out waiting for data; will call the user-specified callback later.
# norepo-sync The directory isn't a git repo.
# ok-sync The directory is a git repo.
#
# When the callback is called VCS_STATUS_RESULT is set to one of the following values:
#
# norepo-async The directory isn't a git repo.
# ok-async The directory is a git repo.
#
# If VCS_STATUS_RESULT is ok-sync or ok-async, additional variables are set:
#
# VCS_STATUS_WORKDIR Git repo working directory. Not empty.
# VCS_STATUS_COMMIT Commit hash that HEAD is pointing to. Either 40 hex digits or empty
# if there is no HEAD (empty repo).
# VCS_STATUS_LOCAL_BRANCH Local branch name or empty if not on a branch.
# VCS_STATUS_REMOTE_NAME The remote name, e.g. "upstream" or "origin".
# VCS_STATUS_REMOTE_BRANCH Upstream branch name. Can be empty.
# VCS_STATUS_REMOTE_URL Remote URL. Can be empty.
# VCS_STATUS_ACTION Repository state, A.K.A. action. Can be empty.
# VCS_STATUS_HAS_STAGED 1 if there are staged changes, 0 otherwise.
# VCS_STATUS_HAS_UNSTAGED 1 if there are unstaged changes, 0 if there aren't, -1 if unknown.
# VCS_STATUS_HAS_UNTRACKED 1 if there are untracked files, 0 if there aren't, -1 if unknown.
# VCS_STATUS_COMMITS_AHEAD Number of commits the current branch is ahead of upstream.
# Non-negative integer.
# VCS_STATUS_COMMITS_BEHIND Number of commits the current branch is behind upstream. Non-negative
# integer.
# VCS_STATUS_STASHES Number of stashes. Non-negative integer.
# VCS_STATUS_TAG The last tag (in lexicographical order) that points to the same
# commit as HEAD.
#
# The point of reporting -1 as unstaged and untracked is to allow the command to skip scanning
# files in large repos. See -m flag of gitstatus_start.
#
# gitstatus_query returns an error if gitstatus_start hasn't been called in the same shell or
# the call had failed.
#
# !!!!! WARNING: CONCURRENT CALLS WITH THE SAME NAME ARE NOT ALLOWED !!!!!
#
# It's illegal to call gitstatus_query if the last asynchronous call with the same NAME hasn't
# completed yet. If you need to issue concurrent requests, use different NAME arguments.
function gitstatus_query() {
emulate -L zsh
setopt err_return no_unset
local opt
local dir=${${GIT_DIR:-$PWD}:a}
local callback=''
local -F timeout=-1
while true; do
getopts "d:c:t:" opt || break
case $opt in
d) dir=$OPTARG;;
c) callback=$OPTARG;;
t) timeout=$OPTARG;;
?) return 1;;
done) break;;
esac
done
(( OPTIND == ARGC )) || { echo "usage: gitstatus_query [OPTION]... NAME" >&2; return 1 }
local name=${*[$OPTIND]}
[[ -n ${(P)${:-GITSTATUS_DAEMON_PID_${name}}:-} ]]
# Verify that gitstatus_query is running in the same process that ran gitstatus_start.
local client_pid_var=_GITSTATUS_CLIENT_PID_${name}
[[ ${(P)client_pid_var} == $$ ]]
local req_fd_var=_GITSTATUS_REQ_FD_${name}
local -i req_fd=${(P)req_fd_var}
local -r req_id="$EPOCHREALTIME"
echo -nE "${req_id} ${callback}"$'\x1f'"${dir}"$'\x1e' >&$req_fd
while true; do
_gitstatus_process_response $name $timeout $req_id
[[ $VCS_STATUS_RESULT == *-async ]] || break
done
[[ $VCS_STATUS_RESULT != tout || -n $callback ]]
}
function _gitstatus_process_response() {
emulate -L zsh
setopt err_return no_unset
local name=$1
local -F timeout=$2
local req_id=$3
local resp_fd_var=_GITSTATUS_RESP_FD_${name}
typeset -g VCS_STATUS_RESULT
(( timeout >= 0 )) && local -a t=(-t $timeout) || local -a t=()
local -a resp
IFS=$'\x1f' read -rd $'\x1e' -u ${(P)resp_fd_var} $t -A resp || {
VCS_STATUS_RESULT=tout
return
}
local -a header=("${(@Q)${(z)resp[1]}}")
[[ ${header[1]} == $req_id ]] && local -i ours=1 || local -i ours=0
shift header
[[ ${resp[2]} == 1 ]] && {
(( ours )) && VCS_STATUS_RESULT=ok-sync || VCS_STATUS_RESULT=ok-async
typeset -g VCS_STATUS_WORKDIR="${resp[3]}"
typeset -g VCS_STATUS_COMMIT="${resp[4]}"
typeset -g VCS_STATUS_LOCAL_BRANCH="${resp[5]}"
typeset -g VCS_STATUS_REMOTE_BRANCH="${resp[6]}"
typeset -g VCS_STATUS_REMOTE_NAME="${resp[7]}"
typeset -g VCS_STATUS_REMOTE_URL="${resp[8]}"
typeset -g VCS_STATUS_ACTION="${resp[9]}"
typeset -gi VCS_STATUS_HAS_STAGED="${resp[10]}"
typeset -gi VCS_STATUS_HAS_UNSTAGED="${resp[11]}"
typeset -gi VCS_STATUS_HAS_UNTRACKED="${resp[12]}"
typeset -gi VCS_STATUS_COMMITS_AHEAD="${resp[13]}"
typeset -gi VCS_STATUS_COMMITS_BEHIND="${resp[14]}"
typeset -gi VCS_STATUS_STASHES="${resp[15]}"
typeset -g VCS_STATUS_TAG="${resp[16]}"
} || {
(( ours )) && VCS_STATUS_RESULT=norepo-sync || VCS_STATUS_RESULT=norepo-async
unset VCS_STATUS_WORKDIR
unset VCS_STATUS_COMMIT
unset VCS_STATUS_LOCAL_BRANCH
unset VCS_STATUS_REMOTE_BRANCH
unset VCS_STATUS_REMOTE_NAME
unset VCS_STATUS_REMOTE_URL
unset VCS_STATUS_ACTION
unset VCS_STATUS_HAS_STAGED
unset VCS_STATUS_HAS_UNSTAGED
unset VCS_STATUS_HAS_UNTRACKED
unset VCS_STATUS_COMMITS_AHEAD
unset VCS_STATUS_COMMITS_BEHIND
unset VCS_STATUS_STASHES
unset VCS_STATUS_TAG
}
(( ! ours )) && (( #header )) && emulate -L zsh && "${header[@]}" || true
}
# Starts gitstatusd in the background. Does nothing and succeeds if gitstatusd is already running.
#
# Usage: gitstatus_start [OPTION]... NAME
#
# -t FLOAT Fail the self-check on initialization if not getting a response from gitstatusd for
# this this many seconds. Defaults to 5.
# -m INT Report -1 unstaged and untracked if there are more than this many files in the index.
# Negative value means infinity. Defaults to -1.
function gitstatus_start() {
emulate -L zsh
setopt err_return no_unset no_bg_nice
local opt
local -F timeout=5
local -i max_dirty=-1
while true; do
getopts "t:m:" opt || break
case $opt in
t) timeout=$OPTARG;;
m) max_dirty=$OPTARG;;
?) return 1;;
done) break;;
esac
done
(( timeout > 0 )) || { echo "invalid -t: $timeout" >&2; return 1 }
(( OPTIND == ARGC )) || { echo "usage: gitstatus_start [OPTION]... NAME" >&2; return 1 }
local name=${*[$OPTIND]}
[[ -z ${(P)${:-GITSTATUS_DAEMON_PID_${name}}:-} ]] || return 0
local os && os=$(uname -s) && [[ -n $os ]]
local arch && arch=$(uname -m) && [[ -n $arch ]]
local daemon && daemon=${GITSTATUS_DAEMON:-${${(%):-%x}:A:h}/bin/gitstatusd-${os:l}-${arch:l}}
[[ -f $daemon ]] || { echo "file not found: $daemon" >&2 && return 1 }
local lock_file req_fifo resp_fifo log_file
local -i lock_fd=-1 req_fd=-1 resp_fd=-1 daemon_pid=-1
function gitstatus_start_impl() {
lock_file=$(mktemp "${TMPDIR:-/tmp}"/gitstatus.$$.lock.XXXXXXXXXX)
zsystem flock -f lock_fd $lock_file
req_fifo=$(mktemp -u "${TMPDIR:-/tmp}"/gitstatus.$$.pipe.req.XXXXXXXXXX)
mkfifo $req_fifo
sysopen -rw -o cloexec,sync -u req_fd $req_fifo
command rm -f $req_fifo
resp_fifo=$(mktemp -u "${TMPDIR:-/tmp}"/gitstatus.$$.pipe.resp.XXXXXXXXXX)
mkfifo $resp_fifo
sysopen -rw -o cloexec -u resp_fd $resp_fifo
command rm -f $resp_fifo
function _gitstatus_process_response_${name}() {
_gitstatus_process_response ${${(%)${:-%N}}#_gitstatus_process_response_} 0 ''
}
zle -F $resp_fd _gitstatus_process_response_${name}
[[ ${GITSTATUS_ENABLE_LOGGING:-0} == 1 ]] &&
log_file=$(mktemp "${TMPDIR:-/tmp}"/gitstatus.$$.log.XXXXXXXXXX) ||
log_file=/dev/null
local -i threads=${GITSTATUS_NUM_THREADS:-0}
(( threads > 0)) || {
case $os in
FreeBSD) threads=$(( 2 * $(sysctl -n hw.ncpu) ));;
*) threads=$(( 2 * $(getconf _NPROCESSORS_ONLN) ));;
esac
(( threads <= 32 )) || threads=32
}
# We use `zsh -c` instead of plain {} or () to work around bugs in zplug. It hangs on startup.
zsh -xc "
${(q)daemon} \
--lock-fd=3 \
--parent-pid=$$ \
--num-threads=$threads \
--dirty-max-index-size=$max_dirty
echo -nE $'bye\x1f0\x1e'
" <&$req_fd >&$resp_fd 2>$log_file 3<$lock_file &!
daemon_pid=$!
command rm -f $lock_file
local reply
echo -nE $'hello\x1f\x1e' >&$req_fd
IFS='' read -r -d $'\x1e' -u $resp_fd -t $timeout reply
[[ $reply == $'hello\x1f0' ]]
function _gitstatus_cleanup_${ZSH_SUBSHELL}_${daemon_pid}() {
emulate -L zsh
setopt err_return no_unset
local -i daemon_pid=${${(%)${:-%N}}#_gitstatus_cleanup_${ZSH_SUBSHELL}_}
[[ $daemon_pid -gt 0 ]] && kill -- -$daemon_pid &>/dev/null
}
add-zsh-hook zshexit _gitstatus_cleanup_${ZSH_SUBSHELL}_${daemon_pid}
}
gitstatus_start_impl && {
typeset -g GITSTATUS_DAEMON_LOG_${name}=$log_file
typeset -gi GITSTATUS_DAEMON_PID_${name}=$daemon_pid
typeset -giH _GITSTATUS_REQ_FD_${name}=$req_fd
typeset -giH _GITSTATUS_RESP_FD_${name}=$resp_fd
typeset -giH _GITSTATUS_CLIENT_PID_${name}=$$
unset -f gitstatus_start_impl
} || {
echo "gitstatus failed to initialize" >&2 || true
[[ $daemon_pid -gt 0 ]] && kill -- -$daemon_pid &>/dev/null || true
[[ $lock_fd -ge 0 ]] && zsystem flock -u $lock_fd || true
[[ $req_fd -ge 0 ]] && exec {req_fd}>&- || true
[[ $resp_fd -ge 0 ]] && { zle -F $resp_fd || true } && { exec {resp_fd}>&- || true}
command rm -f $lock_file $req_fifo $resp_fifo || true
unset -f gitstatus_start_impl
return 1
}
}
# Usage: gitstatus_check NAME.
#
# Returns 0 if and only if `gitstatus_start NAME` has succeeded previously.
# If it returns non-zero, gitstatus_query NAME is guaranteed to return non-zero.
function gitstatus_check() {
local name=$1
[[ -n ${(P)${:-GITSTATUS_DAEMON_PID_${name}}:-} ]]
}
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