pantry/projects/git-scm.org/git-shim

#!/bin/sh

set -e

find_git_command() {
  for arg in "$@"; do
    if test "$SKIP" = 1; then
      SKIP=0
      continue
    fi
    case $arg in
    -C) SKIP=1; continue;;
    -*);;
    *)
      echo "$arg"
      return  # found the command!
    esac
  done
}

libexec="$(cd "$(dirname "$0")/.." && pwd)"/libexec

# extract the git subcommand
cmd=$(find_git_command "$@")

_provides() {
  if foo="$(pkgx --provider git-"$cmd")"; then
    echo "$foo"
  else
    # syncing is slow but let’s be sure about it
    pkgx --sync --provider git-"$cmd"
  fi
}

if [ -z "$cmd" ]; then
  exec "$libexec/git" "$@"
elif [ -x "$libexec/git-$cmd" ] && [ -f "$libexec/git-$cmd" ]; then
  exec "$libexec/git" "$@"
elif type "git-$cmd" >/dev/null 2>&1; then
  exec "$libexec/git" "$@"
elif command -v pkgx >/dev/null 2>&1 && pkg=$(_provides); then
  exec pkgx +"$pkg" "$libexec/git" "$@"
else
  exec "$libexec/git" "$@"
fi