#!/usr/bin/env bash

# This script adds color highlighting to the output from Neomake's Vader tests
# (when called with "vader"), or to the file that gets written into according
# to `neomake_logfile`.
#
# You can use the following to watch colored logs in a terminal window, after
# having used `let g:neomake_logfile = '/tmp/neomake.log'` in Neovim/Vim:
#
#     tail -f /tmp/neomake.log | /path/to/neomake/contrib/highlight-log

bold="[1m"  # $(tput bold)
bold_off="[22m"
debug_color="[2m"  # $(tput dim), does not work in urxvt (although in infocmp/terminfo).
debug_color_off="[22m"
color_off="[39m"
log_color="[33;1m"
log_color_off="$bold_off$color_off"
error_color="[31;1m"
error_color_off="$bold_off$color_off"

# compact: display test headers, but not inner output for successful ones.
compact=0

while [ $# -ne 0 ]; do
    case $1 in
    --compact) compact=1; shift ;;
    --)  shift; break ;;
    -?*) echo "Unknown option: $1" 1>&2; exit 64 ;;
    *) break ;;
    esac
done

if [ "$1" = vader ]; then
  # Match non-log lines (i.e. keep output from :Log, which should cause
  # all messages from a case to be visible).
  # This should also ignore empty lines and lines starting with a character
  # (e.g. via NVIM_LOG_FILE:=/dev/stderr, and from :echom).
  re_log_line='^(.*(  )?    )(> .*)$'
  re_ignore_log_line='^.*(  )?    > \[(debug  |verbose|warning|error  )|((D|V|W|E) +\+[.0-9]+)\]'

  colorize() {
    # Only colorize if stdout is connected to a tty (not with :!make).
    if ! [ -t 1 ]; then
      cat -
      return
    fi

    # sed: add coloring to Vader's output:
    # 1. failures (includes pending) in red "(X)"
    # 2. test case header in bold "(2/2)"
    # 3. Neomake's error log messages
    # 4. Neomake's debug log messages
    # 5. non-Neomake log lines (e.g. from :Log)
    sed -E -e 's/^(([^ ].*)? +)\([ [:digit:]]+\/[[:digit:]]+\) \[[ [:alpha:]]+\] \(X\).*/'"$error_color"'\0'"$error_color_off"'/' \
      -e 's/^(([^ ].*)? +)(\([ [:digit:]]+\/[[:digit:]]+\))/\1'"$bold"'\3'"$bold_off"'/' \
      -e 's/^ +> \[(error  |E \+[.[:digit:]]+)\]: .*/'"$bold"'\0'"$bold_off"'/' \
      -e 's/^ +> \[(debug  |D \+[.[:digit:]]+)\]: .*/'"$debug_color"'\0'"$debug_color_off"'/' \
      -e '/'"$re_ignore_log_line"'/! s/'"$re_log_line"'/\1'"$log_color"'\3'"$log_color_off"'/'
  }

  if ((compact)); then
    # Do not display output for successful tests (i.e. the log statements).
    last_start_match=
    # Match Vader header ("( 1/33) [EXECUTE] …"), but also if there is output
    # from Vim, e.g. with ":colder".
    re_vader_header='^([^ ].*)?\ +(\(\ *[0-9]+/[0-9]+\))'
    filtering=0
    finished_reading=0
    stopped_filtering=0
    while [ "$finished_reading" = 0 ]; do
      if ! read -r; then
        if [ -z "$REPLY" ]; then
          break
          finished_reading=1
        fi
      fi
      if [[ "$REPLY" == *'Vader error:'* ]] || [[ "$REPLY" == 'Error'* ]] || [[ "$REPLY" == 'Traceback'* ]]; then
        printf "\r" >&2
        printf "[31m[1m%s[0m\n" "$REPLY"
        continue
      fi
      if (( stopped_filtering )); then
        echo "$REPLY"
        continue
      fi
      if [[ "$REPLY" == *'Starting Vader:'* ]]; then
        echo "$REPLY"
      elif [[ "$REPLY" == '      Duration: '* ]]; then
        echo "$REPLY"
      elif [[ "$REPLY" == *'(X)'* ]]; then
        # Should also match "(1/1) [EXECUTE] (X) Error: Vim(function):E126: Missing :endfunction" already.
        if [[ -n "$filtered" ]]; then
          echo "$filtered"
        fi
        echo "$REPLY"
        filtered=
        filtering=0
      elif [[ "$REPLY" =~ $re_vader_header  ]]; then
        filtering=1
        if [[ ${BASH_REMATCH[2]} == "$last_start_match" ]]; then
          filtered="$filtered"$'\n'"$REPLY"
        else
          echo "$REPLY"
          filtered=
        fi
        last_start_match="${BASH_REMATCH[2]}"
      elif [[ "$REPLY" == *'Success/Total: '* || "$REPLY" == '  Slowest tests:' ]]; then
        echo "$REPLY"
        filtering=0
        filtered=
        stopped_filtering=1
      elif ! ((filtering)); then
        echo "$REPLY"
      elif [[ "$REPLY" =~ $re_log_line && ! "$REPLY" =~ $re_ignore_log_line ]]; then
        if [[ "$REPLY" =~ '> SKIP:' ]]; then
          echo "$REPLY"
          continue
        fi
        if [[ -n "$filtered" ]]; then
          echo "$filtered"
        fi
        echo "$REPLY"
        filtered=
        filtering=0
      elif [[ -n "$filtered" ]]; then
        filtered="$filtered"$'\n'"$REPLY"
      else
        filtered="$REPLY"
      fi
    done
  else
    cat -
  fi | colorize

else
  # Output from neomake_logfile.
  error='^[:[:digit:]]\+ [[:digit:]]\+ \[E .*'
  warn='^[:[:digit:]]\+ [[:digit:]]\+ \[W .*'
  debug='^[:[:digit:]]\+ [[:digit:]]\+ \[D .*'
  sed -e "s/$error/[31m[1m\0[0m/" \
      -e "s/$warn/w:[33m\0[0m/" \
      -e "s/$debug/$debug_color\\0$debug_color_off/"
fi
