adding dependency check; improve help display

fsfe-preview.sh

@@ -25,6 +25,24 @@
 #  
 #######################################################################
 
+# Check dependencies (stolen from build_main.sh)
+deperrors=''
+for depend in realpath rsync xsltproc xmllint sed find egrep grep wc make tee date iconv; do
+  if ! which "$depend" >/dev/null 2>&1; then
+    deperrors="$depend $deperrors"
+  fi
+done
+if [ -n "$deperrors" ]; then
+  printf '\033[1;31m'
+  cat <<-EOF
+	The build script depends on some other programs to function.
+	Not all of those programs could be located on your system.
+	Please use your package manager to install the following programs:
+	EOF
+  printf '\n\033[0;31m%s\n' "$deperrors"
+  exit 1
+fi >>/dev/stderr
+
 ROOT=$(dirname "$(readlink -f "$0")")
 if [ ! -e "$ROOT"/config.cfg ]; then echo "Missing config.cfg file. Edit and rename config.cfg.sample"; exit 1; fi
 source "$ROOT"/config.cfg
@@ -37,12 +55,15 @@ if [ "$1" = "" ]; then
   echo "Usage: "
   echo
   echo "$self file.en.xhtml"
-  echo "   -- build single XHTML file from your source to the local web directory"
-  echo "      the destination will be on the same relative level of the selected XHTML file"
+  echo "   -- build single XHTML file from your source to the local web "
+  echo "      directory"
+  echo "      The destination will be on the same relative level of the "
+  echo "      selected XHTML file"
   echo "      If not a XHTML file, it will be copied to the web directory"
   echo
   echo "$self --copy picture.png look/style.css"
-  echo "   -- Just copies several files to the local web directory without even trying to build them"
+  echo "   -- Just copies several files to the local web directory without "
+  echo "      even trying to build them"
   exit 0
 fi