unixorn/git-extra-commands

#!/usr/bin/env bash
#
# Browse through commits with fzf
#
# From https://github.com/junegunn/fzf/wiki/examples

set -o pipefail
if [[ -n "$DEBUG" ]]; then
  set -x
fi

function fail() {
  printf '%s\n' "$1" >&2  ## Send message to stderr. Exclude >&2 if you don't want it that way.
  exit "${2-1}"  ## Return a code specified by $2 or 1 by default.
}

function has() {
  which "$@" > /dev/null 2>&1
}

# shellcheck disable=SC2120
function glNoGraph() {
  git log --color=always --format="%C(auto)%h%d %s %C(black)%C(bold)%cr% C(auto)%an" "$@"
}

_gitLogLineToHash="echo {} | grep -o '[a-f0-9]\{7\}' | head -1"
_viewGitLogLine="$_gitLogLineToHash | xargs -I % sh -c 'git show --color=always % | diff-so-fancy'"

# fcoc_preview - checkout git commit with previews
function fcoc_preview() {
  # shellcheck disable=SC2119,SC2120,SC2146,SC2086,SC2046,SC2001
  commit=$( glNoGraph |
    fzf --no-sort --reverse --tiebreak=index --no-multi \
        --ansi --preview="$_viewGitLogLine" ) &&
  git checkout $(echo "$commit" | sed "s/ .*//")
}

if has fzf; then
  fcoc_preview
else
  myname=$(basename "$0")
  fail "$myname needs fzf and can't find it in $PATH"
fi