added testing shell script

.gitignore

@@ -244,6 +244,9 @@ TSWLatexianTemp*
 Output
 .tex
 
+# Testing
+.testing
+
 ## -- macOS ignore
 # General
 .DS_Store

test/testing.sh

@@ -0,0 +1,74 @@
+#!/usr/bin/env sh
+
+# Copyright (c) 2018 - 2022, Martin Scheidt (ISC license)
+# Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+## -- log functions
+# Halt on error
+set -e
+
+ECHO=`which echo`
+
+error_occured=0
+
+exec 3>&2 # logging stream (file descriptor 3) defaults to STDERR
+verbosity=2 # default to show warnings
+silent_lvl=0
+err_lvl=1
+wrn_lvl=2
+inf_lvl=3
+dbg_lvl=4
+
+log_n() { log $silent_lvl "NOTE: $1"; } # Always prints
+log_e() { log $err_lvl "ERROR: $1"; }
+log_w() { log $wrn_lvl "WARNING: $1"; }
+log_i() { log $inf_lvl "INFO: $1"; } # "info" is already a command
+log_d() { log $dbg_lvl "DEBUG: $1"; }
+log() {
+  if [ $verbosity -ge $1 ]; then
+    # Expand escaped characters, wrap at 70 chars, indent wrapped lines
+    $ECHO "$2" | fold -w80 -s >&3 || true
+  fi
+  $ECHO "$2" | fold -w80 -s >> $logfile || true
+}
+
+## -- commands
+check_tex_distro() {
+  # check for latexmk
+  status=0
+  command -v pdflatex >/dev/null 2>&1 || status=1
+  if [ $status = 0 ]; then
+    log_d "pdflatex found"
+    return 0
+  fi
+  
+  log_e "Program 'pdflatex' not found."
+  log_e "Be sure to have texlive or mactex installed!"
+  exit 1
+}
+
+check_imagemagick() {
+  # check for latexmk
+  status=0
+  command -v compare >/dev/null 2>&1 || status=1
+  if [ $status = 0 ]; then
+    log_d "compare found"
+    return 0
+  fi
+  
+  log_e "Program 'compare' not found."
+  log_e "Be sure to have imagemagick installed!"
+  exit 1
+}
+
+#-------------------------------------------------------------------------------
+
+check_tex_distro
+check_imagemagick
+
+mkdir -p .testing
+
+# TODO: for-loop
+pdflatex -output-directory=.testing -interaction=batchmode -halt-on-error *.tex 2>&1 > /dev/null
+compare -metric DSSIM -colorspace RGB .testing/*.pdf *_expected.pdf .testing/*_diff.png
+