fix: appimage: adjust docdir for help menu

CHANGELOG

@@ -4,7 +4,7 @@
 fix: don't error on blank media in medium-info (#19), bug present upstream since 0.79.5
 fix: gui: fix the 'SetLabelText() failed' error caption on the medium-info window (#19), bug present upstream since 0.72.3
 fix: add CHANGELOG, TODO, CREDITS to dist for the Help menu
-chore: appimage: add missing gtk engines
+chore: appimage: add missing gtk engines and adjust docdir for help menu
 chore: enhance packaging, update locales, changelog et al.
 
 0.79.6.patchlevel-4 04-09-2020 *UNOFFICIAL*

contrib/AppRun.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
 DIR="$(readlink -f "$(dirname "$0")")"
 export GTK_PATH="$DIR/usr/lib/gtk-2.0"
+export DVDISASTER_DOCDIR="$DIR/usr/share/doc/dvdisaster"
 exec "$DIR/usr/bin/dvdisaster" "$@"

src/closure.c

@@ -91,6 +91,12 @@ static void get_base_dirs()
    Verbose("Using path from get_exe_path() = %s\n", Closure->binDir);
 #endif
 
+   /* for AppImage, get docdir from env if there */
+   if (g_getenv("DVDISASTER_DOCDIR"))
+   {  if (Closure->docDir)
+         g_free(Closure->docDir);
+      Closure->docDir = g_strdup(g_getenv("DVDISASTER_DOCDIR"));
+   }
 
    /*** The location of the dotfile depends on the operating system. 
 	Under Unix the users home directory is used. */