notmuch: Add a new "notmuch config" command for querying configuration.

[notmuch] / notmuch-config.c

diff --git a/notmuch-config.c b/notmuch-config.c
index 58f83b0d299c8d4b6213758448bf1db69302b6b3..2e81d1c22e4a27232d561f119b4962663c024fc0 100644 (file)
--- a/notmuch-config.c
+++ b/notmuch-config.c
@@ -68,7 +68,7 @@ struct _notmuch_config {
     char *database_path;
     char *user_name;
     char *user_primary_email;
-    char **user_other_email;
+    const char **user_other_email;
     size_t user_other_email_length;
     const char **new_tags;
     size_t new_tags_length;
@@ -151,26 +151,33 @@ get_username_from_passwd_file (void *ctx)
  * etc.), this function will print a message to stderr and return
  * NULL.
  *
- * Note: It is *not* an error if the specified configuration file does
- * not exist. In this case, a default configuration will be created
- * and returned. Subsequently calling notmuch_config_save will cause
- * the configuration to be written to the filename specified at the
- * time of notmuch_config_open.
+ * FILE NOT FOUND: When the specified configuration file (whether from
+ * 'filename' or the $NOTMUCH_CONFIG environment variable) does not
+ * exist, the behavior of this function depends on the 'is_new_ret'
+ * variable.
  *
- * The default configuration settings are determined as follows:
+ *     If is_new_ret is NULL, then a "file not found" message will be
+ *     printed to stderr and NULL will be returned.
+
+ *     If is_new_ret is non-NULL then a default configuration will be
+ *     returned and *is_new_ret will be set to 1 on return so that
+ *     the caller can recognize this case.
+ *
+ *     These default configuration settings are determined as
+ *     follows:
  *
- *     database_path:          $HOME/mail
+ *             database_path:          $HOME/mail
  *
- *     user_name:              From /etc/passwd
+ *             user_name:              From /etc/passwd
  *
- *     user_primary_mail:      $EMAIL variable if set, otherwise
- *                             constructed from the username and
- *                             hostname of the current machine.
+ *             user_primary_mail:      $EMAIL variable if set, otherwise
+ *                                     constructed from the username and
+ *                                     hostname of the current machine.
  *
- *     user_other_email:       Not set.
+ *             user_other_email:       Not set.
  *
- * The default configuration also contains comments to guide the user
- * in editing the file directly.
+ *     The default configuration also contains comments to guide the
+ *     user in editing the file directly.
  */
 notmuch_config_t *
 notmuch_config_open (void *ctx,
@@ -220,14 +227,19 @@ notmuch_config_open (void *ctx,
                                     G_KEY_FILE_KEEP_COMMENTS,
                                     &error))
     {
-       /* We are capable of dealing with a non-existent configuration
-        * file, so be silent about that (unless the user had set a
-        * non-default configuration file with the NOTMUCH_CONFIG
-        * variable)
+       /* If the caller passed a non-NULL value for is_new_ret, then
+        * the caller is prepared for a default configuration file in
+        * the case of FILE NOT FOUND. Otherwise, any read failure is
+        * an error.
         */
-       if (notmuch_config_env ||
-           !(error->domain == G_FILE_ERROR &&
-             error->code == G_FILE_ERROR_NOENT))
+       if (is_new_ret &&
+           error->domain == G_FILE_ERROR &&
+           error->code == G_FILE_ERROR_NOENT)
+       {
+           g_error_free (error);
+           is_new = 1;
+       }
+       else
        {
            fprintf (stderr, "Error reading configuration file %s: %s\n",
                     config->filename, error->message);
@@ -235,9 +247,6 @@ notmuch_config_open (void *ctx,
            g_error_free (error);
            return NULL;
        }
-
-       g_error_free (error);
-       is_new = 1;
     }
 
     /* Whenever we know of configuration sections that don't appear in
@@ -465,7 +474,7 @@ notmuch_config_set_user_primary_email (notmuch_config_t *config,
     config->user_primary_email = NULL;
 }
 
-char **
+const char **
 notmuch_config_get_user_other_email (notmuch_config_t *config,
                                     size_t *length)
 {
@@ -553,3 +562,56 @@ notmuch_config_set_new_tags (notmuch_config_t *config,
     config->new_tags = NULL;
 }
 
+int
+notmuch_config_command (void *ctx, int argc, char *argv[])
+{
+    notmuch_config_t *config;
+    const char *item;
+
+    if (argc != 2) {
+       fprintf (stderr, "Error: notmuch config requires two arguments.\n");
+       return 1;
+    }
+
+    if (strcmp (argv[0], "get")) {
+       fprintf (stderr, "Unrecognized argument for notmuch config: %s\n",
+                argv[0]);
+       return 1;
+    }
+
+    config = notmuch_config_open (ctx, NULL, NULL);
+    if (config == NULL)
+       return 1;
+
+    item = argv[1];
+
+    if (strcmp(item, "database.path") == 0) {
+       printf ("%s\n", notmuch_config_get_database_path (config));
+    } else if (strcmp(item, "user.name") == 0) {
+       printf ("%s\n", notmuch_config_get_user_name (config));
+    } else if (strcmp(item, "user.primary_email") == 0) {
+       printf ("%s\n", notmuch_config_get_user_primary_email (config));
+    } else if (strcmp(item, "user.other_email") == 0) {
+       const char **other_email;
+       size_t i, length;
+       
+       other_email = notmuch_config_get_user_other_email (config, &length);
+       for (i = 0; i < length; i++)
+           printf ("%s\n", other_email[i]);
+    } else if (strcmp(item, "new.tags") == 0) {
+       const char **tags;
+       size_t i, length;
+
+       tags = notmuch_config_get_new_tags (config, &length);
+       for (i = 0; i < length; i++)
+           printf ("%s\n", tags[i]);
+    } else {
+       fprintf (stderr, "Unknown configuration item: %s\n",
+                argv[1]);
+       return 1;
+    }
+
+    notmuch_config_close (config);
+
+    return 0;
+}