#! /usr/bin/env bash
shopt -s extglob
[ -n "$TMUXIFIER_DEBUG" ] && set -x

# Load internal utility functions.
source "$TMUXIFIER/lib/util.sh"

# Provide tmuxifier help
if calling-help "$@"; then
  echo "usage: tmuxifier tmux-version [<target-version>]

Outputs current Tmux version. If given optional target-version it outputs one
of three possible characters indicating if the current Tmux version number is
equal to, less than, or greater than the <target-version>.

The three possible outputs are \"=\", \"<\", and \">\"."
  exit
fi

version=$(tmux -V)
version=${version/tmux /}

# Fix for tmux next-* versions
version=${version/next-/}

if [ -z "$1" ]; then
  echo "$version"
  exit
fi

if [ "$version" == "master" ]; then
  # When version string is "master", tmux was compiled from source, and we
  # assume it's later than whatever the <target-version> is.
  echo '>'
else
  # Fix for "1.9a" version comparison, as vercomp() can only deal with
  # purely numeric version numbers.
  version=${version//+([a-zA-Z])/}

  vercomp "$version" "$1"
  case $? in
    0) echo '=' ;;
    1) echo '>' ;;
    2) echo '<' ;;
  esac
fi