.git-helpers

#!/bin/bash

# -----------------------------------------------------------------------------
# aliases to avoid the space in gitconfig

alias g='git'
alias gl='git l'
alias gst='git st'
alias gs='git s'
alias gc='git c'
alias gcj='git cj'
alias gcs='git c -S'
alias gdc='git dc'
alias gdcs='git dcs'
alias gd='git d'
alias gds='git ds'
alias gdm='git dm'
alias ga='git a'
alias gf='git f'
alias gu='git u'
alias gut='git ut'
alias gp='git p'
alias gpu='git pu'
alias gpr='git p --rebase'
alias gps='git ps'
alias gt='cd $(git rev-parse --show-toplevel)'
alias gm='git m'
alias gw='git whoami'
alias gws='git ws'
alias gblam='git blam'

# -----------------------------------------------------------------------------
# fuzzy helpers for aliases

# git commit browser
# based on https://gist.github.com/junegunn/f4fca918e937e6bf5bad#gistcomment-1666125
# NB: relies on pager and "git open" alias being set in .gitconfig!
gitlog() {
  git log --color=always --no-merges \
      --format="%C(auto)%h%d %s <%C(blue)%an%Creset> %C(black)%C(bold)%cr" "$@" |
  fzf --ansi --no-sort --reverse --height 100% --tiebreak=index \
      --header="enter:show, F3:open, ESC:quit, q:quit-show" \
      --bind="ctrl-m:execute:(git show {1} | delta | less -R)" \
      --bind="f3:execute:(git open {1})"
}


# git stash browser using fzf
# https://gist.github.com/junegunn/a563d9e3e07fd721d618562762ec619d
gitstash() {
  local out k reflog
  # shellcheck disable=SC2207,SC2016
  out=(
    $(git stash list --pretty='%C(yellow)%gd %>(14)%Cgreen%cr %C(blue)%gs' |
      fzf --ansi --no-sort --header='enter:show, F3:diff, F4:pop, F5:apply, F6:drop' \
          --preview='git stash show --color=always -p $(cut -d" " -f1 <<< {}) | head -'$LINES \
          --preview-window=down:50% --reverse \
          --bind='enter:execute(git stash show --color=always -p $(cut -d" " -f1 <<< {}) > /dev/tty)' \
          --bind='F3:execute(git diff --color=always $(cut -d" " -f1 <<< {}) > /dev/tty)' \
          --expect=F4,F5,F6))
  k=${out[0]}
  reflog=${out[1]}
  [ -n "$reflog" ] && case "$k" in
    F4) git stash pop "$reflog" ;;
    F5) git stash apply "$reflog" ;;
    F6) git stash drop "$reflog" ;;
  esac
}

gitblame() {
  local -r file="${1:-$(fzf)}"
  git blame "${file}"
}

# -----------------------------------------------------------------------------
# git for loops to check mass statuses for repos in current dir

# usage glscommand "some command"
# glscommand "git master" -> shows default branches
glscommand() {
  local -r command="$1"
  dir=$PWD
  for d in $(fd . --max-depth 1 --type d); do
    cd "$d" || false
    echo -en "$(tput setaf 33)${d} "
    if [[ -d .git ]]; then
      echo -en "$(tput setaf 136)$(zsh -ic "${command}")$(tput sgr0)"
    fi
    echo
    cd ..
  done
  cd "$dir" || true
}

# ls | git prompt
# re-uses a thing from the non-starship prompt
gls() { glscommand "show_git_differences" ;}

# ls | git whoami
glsd() { glscommand "git whoami" ;}

# -----------------------------------------------------------------------------
# helper that was part of old powerline prompt - now used by gls

show_git_differences() {
  [[ $(git rev-parse --is-inside-work-tree 2>/dev/null) == true ]] || return 1

  local unmerged=0 modified=0 has_untracked=0 added=0 is_clean=""

  # shellcheck disable=SC2046
  set -- $(git rev-list --left-right --count "@{upstream}...HEAD" 2>/dev/null)
  local behind_count=$1
  local ahead_count=$2

  # Added (A), Copied (C), Deleted (D), Modified (M), Renamed (R), changed (T), Unmerged (U), Unknown (X), Broken (B)
  while read -r line; do
    case "$line" in
      M*) modified=$(( modified + 1 )) ;;
      U*) unmerged=$(( unmerged + 1 )) ;;
    esac
  done < <(git diff --name-status)

  while read -r line; do
    case "$line" in
      *) added=$(( added + 1 )) ;;
    esac
  done < <(git diff --name-status --cached)

  if [ -n "$(git ls-files --others --exclude-standard)" ]; then
    has_untracked=1
  fi

  local -r stashed=$(( $(git rev-parse --verify refs/stash 2> /dev/null | wc -l) ));

  if [ $(( unmerged + modified + has_untracked + added )) -eq 0 ]; then
    is_clean=1
  fi

  local s=""
  # We always print at least one of these due to definition of is_clean
  # Thus `s` always begins with a leading space
  [[ $ahead_count -gt 0 ]] && s+=" ↑$ahead_count"
  [[ $behind_count -gt 0 ]] && s+=" ↓$behind_count"
  [[ $modified -gt 0 ]] && s+=" +$modified"
  [[ $unmerged -gt 0 ]] && s+=" ✗$unmerged"
  [[ $added -gt 0 ]] && s+=" ●" #$added
  [[ $has_untracked -gt 0 ]] && s+=" …"
  [[ $stashed -gt 0 ]] && s+=" ⚑" #$stashed
  [[ $is_clean -gt 0 ]] && s+=" ✔"

  # remove leading space
  echo -e "$s" | sed 's/\s//'
}