filter and format lua func

logfoo.c

@@ -47,19 +47,47 @@ int main(int argc, char *argv[]) {
     }
 
     while ((read = getline(&line, &len, fp)) != -1) {
+        int filter;
+        size_t formatLen;
+        const char *formatLine;
+        
         trim(line);
 
+        lua_getglobal(L, "filter");
+        lua_pushlstring(L, line, read);
+        if (lua_pcall(L, 1, 1, 0) != 0) {
+            fprintf(stderr, "Error running LUA function 'filter': %s\n", lua_tostring(L, -1));
+            return EXIT_LUAFILE_HANDLING;
+        }
+
+        if (!lua_isboolean(L, -1)) {
+            fprintf(stderr, "LUA function 'filter' did not return a boolean");
+            return EXIT_LUAFILE_HANDLING;
+        }
+
+        filter = lua_toboolean(L, -1);
+        lua_pop(L, 1);
+        if (filter) {
+            continue;
+        }
+
         lua_getglobal(L, "format");
         lua_pushlstring(L, line, read);
         if (lua_pcall(L, 1, 1, 0) != 0) {
             fprintf(stderr, "Error running LUA function 'format': %s\n", lua_tostring(L, -1));
             return EXIT_LUAFILE_HANDLING;
         }
-        printf("%s\n", lua_tostring(L, -1));
+
-        lua_pop(L, 1);
+        if (!lua_isstring(L, -1)) {
+            fprintf(stderr, "LUA function 'format' did not return a string");
+            return EXIT_LUAFILE_HANDLING;
+        }
+
+        formatLine = lua_tolstring(L, -1 , &formatLen);
+        printf("(%zu) %s\n", formatLen, formatLine);
     }
     if (errno) {
-        fprintf(stderr, "Error readling file %s: %s\n", logfile, strerror(errno));
+        fprintf(stderr, "Error reading file %s: %s\n", logfile, strerror(errno));
         return EXIT_LOGFILE_HANDLING;
     }
 

lua/messages.lua

@@ -1,3 +1,7 @@
-function format (line)
+function filter (line)
-    return line:gsub(" ", "\n");
+    return line:find("Unknown kernel command line parameters") == nil
+end
+
+function format (line)
+    return line:match("\"([^\"]+)\"")
 end