Lua: because Rockbox doesn't support any current working directory functionality, 'hack' loadlib so it replace '$' in LUA_PATH_DEFAULT with the directory wherein the current script is.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21595 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lua/loadlib.c

@@ -20,6 +20,7 @@
 
 #include "lauxlib.h"
 #include "lualib.h"
+#include "rocklib.h"
 
 
 #define setprogdir(L)       ((void)0)
@@ -53,7 +54,7 @@ static const char *pushnexttemplate (lua_State *L, const char *path) {
 
 static const char *findfile (lua_State *L, const char *name,
                                            const char *pname) {
-  const char *path;
+  const char *path, *current_path = get_current_path(L, 2);
   name = luaL_gsub(L, name, ".", LUA_DIRSEP);
   lua_getfield(L, LUA_ENVIRONINDEX, pname);
   path = lua_tostring(L, -1);
@@ -63,6 +64,7 @@ static const char *findfile (lua_State *L, const char *name,
   while ((path = pushnexttemplate(L, path)) != NULL) {
     const char *filename;
     filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
+    if(current_path != NULL) filename = luaL_gsub(L, filename, "$", current_path);
     lua_remove(L, -2);  /* remove path template */
     if (readable(filename))  /* does file exist and is readable? */
       return filename;  /* return that file name */

apps/plugins/lua/rockaux.c

@@ -21,6 +21,8 @@
  ****************************************************************************/
 
 #include "plugin.h"
+#define _ROCKCONF_H_ /* Protect against unwanted include */
+#include "lua.h"
 
 #if !defined(SIMULATOR) || defined(__MINGW32__) || defined(__CYGWIN__)
 int errno = 0;
@@ -59,3 +61,34 @@ int strcoll(const char * str1, const char * str2)
     return rb->strcmp(str1, str2);
 }
 
+const char* get_current_path(lua_State *L, int level)
+{
+    static char buffer[MAX_PATH];
+    lua_Debug ar;
+
+    if(lua_getstack(L, level, &ar))
+    {
+        /* Try determining the base path of the current Lua chunk
+            and write it to dest. */
+        lua_getinfo(L, "S", &ar);
+
+        char* curfile = (char*) &ar.source[1];
+        char* pos = rb->strrchr(curfile, '/');
+        if(pos != NULL)
+        {
+            unsigned int len = (unsigned int)(pos - curfile);
+            len = len + 1 > sizeof(buffer) ? sizeof(buffer) - 1 : len;
+
+            if(len > 0)
+                memcpy(buffer, curfile, len);
+
+            buffer[len] = '/';
+            buffer[len+1] = '\0';
+
+            return buffer;
+        }
+    }
+
+    return NULL;
+}
+

apps/plugins/lua/rockconf.h

@@ -29,7 +29,7 @@
 #undef luai_jmpbuf
 
 #undef LUA_PATH_DEFAULT
-#define LUA_PATH_DEFAULT  "./?.lua;" VIEWERS_DIR"/?.lua;"
+#define LUA_PATH_DEFAULT  "$/?.lua;" VIEWERS_DIR"/?.lua;"
 
 #ifndef SIMULATOR
 #include "../../codecs/lib/setjmp.h"

apps/plugins/lua/rocklib.c

@@ -782,34 +782,14 @@ RB_WRAP(read_bmp_file)
 
 RB_WRAP(current_path)
 {
-    char buffer[MAX_PATH];
-    lua_Debug ar;
-
-    if(lua_getstack(L, 1, &ar))
+    const char *current_path = get_current_path(L, 1);
+    if(current_path != NULL)
     {
-        /* Try determining the base path of the current Lua chunk
-            and write it to dest. */
-        lua_getinfo(L, "S", &ar);
-
-        char* curfile = (char*) &ar.source[1];
-        char* pos = rb->strrchr(curfile, '/');
-        if(pos != NULL)
-        {
-            unsigned int len = (unsigned int)(pos - curfile);
-            len = len + 1 > sizeof(buffer) ? sizeof(buffer) - 1 : len;
-
-            if(len > 0)
-                memcpy(buffer, curfile, len);
-
-            buffer[len] = '/';
-            buffer[len+1] = '\0';
-
-            lua_pushstring(L, buffer);
-            return 1;
-        }
+        lua_pushstring(L, current_path);
+        return 1;
     }
-
-    return 0;
+    else
+        return 0;
 }
 
 #define R(NAME) {#NAME, rock_##NAME}

apps/plugins/lua/rocklib.h

@@ -24,7 +24,7 @@
 
 #define LUA_ROCKLIBNAME	"rb"
 LUALIB_API int (luaopen_rock) (lua_State *L);
-bool get_cur_path(lua_State *L, char* dest, size_t dest_size);
+const char* get_current_path(lua_State *L, int level);
 
 #endif /* _ROCKLIB_H_ */