gitver

#!/usr/bin/env bash
set -euo pipefail

# get current git sha of a provided script (full path or in $PATH)  or directory
# looks like 78341f2:2023-07-21:1,1(+),3(-)
#
# EXAMPLE: (by (1) directory (2) fullpath (3+4) app in path )
#  gitver /opt/ni_tools/lncdtools         # 4d99a09:2023-07-24:2,8(+),5(-)
#  gitver /opt/ni_tools/lncdtools/gitver  # dc2e48c:2021-08-09:1,7(+),2(-)
#  gitver gitver                          # dc2e48c:2021-08-09:1,7(+),2(-)
#  gitver dryrun                          # cc2097f:2022-10-11:
#  gitver /tmp                            # git:NA

# 20200909WF - init
# 20230804WF - given file, ouput log+diff specific to file

# what to spit out when error/no git repo
nover=git:NA
file=""

if [ $# -eq 1 ]; then
   repo="$1"
   # try script if not file
   [ ! -r "$repo" ] && repo="$(which "$repo")" || :
   # if given a file, use directory
   if [ -r "$repo" -a ! -d "$repo" ]; then
      file="-- $repo"
      repo="$(dirname "$repo")"
   fi
   if [ ! -d "$repo" ]; then
      echo "# ERROR: gitver given bad dir/file/app: '$1'" >&2
      echo $nover
      exit 1
   fi
   cd "$repo"
fi

if git rev-parse --short HEAD >/dev/null 2>&1; then
   echo $(git log -1 --pretty=format:%h:%as $file):$(git diff --shortstat $file|tr -d '[a-z ]')
else
   echo $nover
fi