lua: add --check option

Signed-off-by: Julien Danjou <julien@danjou.info>

awesome.1.txt

@@ -9,7 +9,7 @@ awesome - awesome window manager
 SYNOPSIS
 --------
 
-*awesome* [*-v* | *--version*] [*-h* | *--help*] [*-c* | *--config* 'FILE']
+*awesome* [*-v* | *--version*] [*-h* | *--help*] [*-c* | *--config* 'FILE'] [*-k* | *--check*]
 
 DESCRIPTION
 -----------
@@ -40,6 +40,8 @@ OPTIONS
     Print help information, then exit.
 *-c*, *--config* 'FILE'::
     Use an alternate configuration file instead of '$XDG_CONFIG_HOME/awesome/rc.lua'.
+*-k*, *--check*::
+    Check configuration file syntax.
 
 DEFAULT MOUSE BINDINGS
 -----------------------

awesome.c

@@ -290,7 +290,8 @@ exit_help(int exit_code)
 "Usage: awesome [OPTION]\n\
   -h, --help             show help\n\
   -v, --version          show version\n\
-  -c, --config FILE      configuration file to use\n");
+  -c, --config FILE      configuration file to use\n\
+  -k, --check            check configuration file syntax\n");
     exit(exit_code);
 }
 
@@ -312,6 +313,7 @@ main(int argc, char **argv)
         { "help",    0, NULL, 'h' },
         { "version", 0, NULL, 'v' },
         { "config",  1, NULL, 'c' },
+        { "check",   0, NULL, 'k' },
         { NULL,      0, NULL, 0 }
     };
 
@@ -339,8 +341,14 @@ main(int argc, char **argv)
         a_strcat(globalconf.argv, cmdlen, argv[i]);
     }
 
+    /* Text won't be printed correctly otherwise */
+    setlocale(LC_CTYPE, "");
+
+    /* init lua */
+    luaA_init();
+
     /* check args */
-    while((opt = getopt_long(argc, argv, "vhc:",
+    while((opt = getopt_long(argc, argv, "vhkc:",
                              long_options, NULL)) != -1)
         switch(opt)
         {
@@ -350,6 +358,17 @@ main(int argc, char **argv)
           case 'h':
             exit_help(EXIT_SUCCESS);
             break;
+          case 'k':
+            if(!luaA_parserc(confpath, false))
+            {
+                fprintf(stderr, "✘ Configuration file error.\n");
+                return EXIT_FAILURE;
+            }
+            else
+            {
+                fprintf(stderr, "✔ Configuration file OK.\n");
+                return EXIT_SUCCESS;
+            }
           case 'c':
             if(a_strlen(optarg))
                 confpath = a_strdup(optarg);
@@ -358,8 +377,6 @@ main(int argc, char **argv)
             break;
         }
 
-    /* Text won't be printed correctly otherwise */
-    setlocale(LC_CTYPE, "");
     globalconf.loop = ev_default_loop(0);
     ev_timer_init(&globalconf.timer, &luaA_on_timer, 0., 0.);
 
@@ -457,10 +474,8 @@ main(int argc, char **argv)
                         globalconf.keysyms, &globalconf.numlockmask,
                         &globalconf.shiftlockmask, &globalconf.capslockmask);
 
-    /* init lua */
-    luaA_init();
-
-    luaA_parserc(confpath);
+    /* Parse and run configuration file */
+    luaA_parserc(confpath, true);
 
     /* scan existing windows */
     scan();

luaa.c

@@ -702,27 +702,47 @@ luaA_init(void)
 
 #define AWESOME_CONFIG_FILE "/awesome/rc.lua"
 
+static bool
+luaA_loadrc(const char *confpath, bool run)
+{
+    if(confpath)
+    {
+        if(!luaL_loadfile(globalconf.L, confpath))
+        {
+            if(run)
+            {
+                if(lua_pcall(globalconf.L, 0, LUA_MULTRET, 0))
+                    fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
+                else
+                {
+                    globalconf.conffile = a_strdup(confpath);
+                    return true;
+                }
+            }
+            else
+                lua_pop(globalconf.L, 1);
+            return true;
+        }
+        else
+            fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
+    }
+    return false;
+}
+
 /** Load a configuration file.
- * \param rcfile The configuration file to load.
+ * \param confpatharg The configuration file to load.
+ * \param run Run the configuration file.
  */
-void
-luaA_parserc(const char *confpatharg)
+bool
+luaA_parserc(const char *confpatharg, bool run)
 {
     int screen;
     const char *confdir, *xdg_config_dirs;
     char *confpath = NULL, **xdg_files, **buf, path[1024];
     ssize_t len;
+    bool ret;
 
-    if(confpatharg)
-    {
-        if(luaL_dofile(globalconf.L, confpatharg))
-            fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
-        else
-        {
-            globalconf.conffile = a_strdup(confpatharg);
-            goto bailout;
-        }
-    }
+    ret = luaA_loadrc(confpatharg, run);
 
     confdir = getenv("XDG_CONFIG_HOME");
 
@@ -748,13 +768,8 @@ luaA_parserc(const char *confpatharg)
     }
     a_strcat(confpath, len, AWESOME_CONFIG_FILE);
 
-    if(luaL_dofile(globalconf.L, confpath))
-        fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
-    else
-    {
-        globalconf.conffile = a_strdup(confpath);
-        goto bailout;
-    }
+    if(!ret)
+        ret = luaA_loadrc(confpath, run);
 
     xdg_config_dirs = getenv("XDG_CONFIG_DIRS");
 
@@ -775,20 +790,14 @@ luaA_parserc(const char *confpatharg)
         a_strcat(confpath, len, AWESOME_CONFIG_FILE);
         snprintf(path, sizeof(path), "package.path = package.path .. \";%s/awesome/?.lua\"", *buf);
         luaA_dostring(globalconf.L, path);
-        if(luaL_dofile(globalconf.L, confpath))
-            fprintf(stderr, "%s\n", lua_tostring(globalconf.L, -1));
-        else
-        {
-            globalconf.conffile = a_strdup(confpath);
-            break;
-        }
+        if(!ret)
+            ret = luaA_loadrc(confpath, run);
     }
 
     for(buf = xdg_files; *buf; buf++)
         p_delete(buf);
     p_delete(&xdg_files);
 
-  bailout:
     /* Assure there's at least one tag */
     for(screen = 0; screen < globalconf.nscreen; screen++)
         if(!globalconf.screens[screen].tags.len)
@@ -796,6 +805,8 @@ luaA_parserc(const char *confpatharg)
                                  &globalconf.screens[screen]);
 
     p_delete(&confpath);
+
+    return ret;
 }
 
 /** Parse a command.

luaa.h

@@ -255,7 +255,7 @@ luaA_otable_new(lua_State *L)
 }
 
 void luaA_init(void);
-void luaA_parserc(const char *);
+bool luaA_parserc(const char *, bool);
 void luaA_cs_init(void);
 void luaA_cs_cleanup(void);
 void luaA_on_timer(EV_P_ ev_timer *w, int revents);