[devhelp/drop-devhelp1-format] Drop Devhelp 1 index format

[Emmanuele Bassi <ebassi src gnome org>]

commit 2c3c216dbf4c16dcfb5def8ef24cb380bfceb34b
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Jul 23 21:54:40 2021 +0100

    Drop Devhelp 1 index format
    
    The Devhelp 2 format was introduced 16 years ago; the Devhelp 1 format
    was officially deprecated in 2017. It's time to let it go.
    
    The only project that still ships a ".devhelp" file is libxml2:
    
      https://gitlab.gnome.org/GNOME/libxml2/-/issues/295

 devhelp/dh-book.c      |  4 ++--
 devhelp/dh-error.h     |  3 ++-
 devhelp/dh-parser.c    | 28 ++++++++--------------------
 devhelp/dh-util-lib.c  |  2 --
 unit-tests/test-util.c | 10 +---------
 5 files changed, 13 insertions(+), 34 deletions(-)
---
diff --git a/devhelp/dh-book.c b/devhelp/dh-book.c
index a58098be..cebcbe1d 100644
--- a/devhelp/dh-book.c
+++ b/devhelp/dh-book.c
@@ -21,8 +21,8 @@
  *
  * A #DhBook usually contains the documentation for one library (or
  * application), for example GLib or GTK. A #DhBook corresponds to one index
- * file. An index file is a file with the extension `*.devhelp`, `*.devhelp2`,
- * `*.devhelp.gz` or `*.devhelp2.gz`.
+ * file. An index file is a file with the extension `*.devhelp2` or
+ * `*.devhelp2.gz`.
  *
  * #DhBook creates a #GFileMonitor on the index file, and emits the
  * #DhBook::updated or #DhBook::deleted signal in case the index file has
diff --git a/devhelp/dh-error.h b/devhelp/dh-error.h
index 8a489fc1..fddeef2f 100644
--- a/devhelp/dh-error.h
+++ b/devhelp/dh-error.h
@@ -15,7 +15,8 @@ G_BEGIN_DECLS
 #define DH_ERROR _dh_error_quark ()
 
 typedef enum {
-        DH_ERROR_MALFORMED_BOOK
+        DH_ERROR_MALFORMED_BOOK,
+        DH_ERROR_UNSUPPORTED_FORMAT
 } DhError;
 
 G_GNUC_INTERNAL
diff --git a/devhelp/dh-parser.c b/devhelp/dh-parser.c
index cb3ae5d9..bc358cff 100644
--- a/devhelp/dh-parser.c
+++ b/devhelp/dh-parser.c
@@ -45,7 +45,7 @@
 #define BYTES_PER_READ 4096
 
 typedef enum {
-        FORMAT_VERSION_1,
+        FORMAT_VERSION_INVALID,
 
         /* The main change is that version 2 uses <keyword> instead of
          * <function>.
@@ -301,15 +301,6 @@ parser_start_node_keyword (DhParser             *parser,
                              "Expected <keyword> element, got <%s> at line %d, column %d.",
                              node_name, line, col);
                 return;
-        } else if (parser->version == FORMAT_VERSION_1 &&
-                   g_ascii_strcasecmp (node_name, "function") != 0) {
-                g_markup_parse_context_get_position (context, &line, &col);
-                g_set_error (error,
-                             DH_ERROR,
-                             DH_ERROR_MALFORMED_BOOK,
-                             "Expected <function> element, got <%s> at line %d, column %d.",
-                             node_name, line, col);
-                return;
         }
 
         for (attr_num = 0; attribute_names[attr_num] != NULL; attr_num++) {
@@ -545,14 +536,11 @@ _dh_parser_read_file (GFile   *index_file,
         if (g_str_has_suffix (index_file_uri, ".devhelp2")) {
                 parser->version = FORMAT_VERSION_2;
                 gz = FALSE;
-        } else if (g_str_has_suffix (index_file_uri, ".devhelp")) {
-                parser->version = FORMAT_VERSION_1;
-                gz = FALSE;
         } else if (g_str_has_suffix (index_file_uri, ".devhelp2.gz")) {
                 parser->version = FORMAT_VERSION_2;
                 gz = TRUE;
         } else {
-                parser->version = FORMAT_VERSION_1;
+                parser->version = FORMAT_VERSION_INVALID;
                 gz = TRUE;
         }
 
@@ -573,12 +561,12 @@ _dh_parser_read_file (GFile   *index_file,
         /* At this point we know that the file exists, the G_IO_ERROR_NOT_FOUND
          * has been catched earlier. So print warning.
          */
-        if (parser->version == FORMAT_VERSION_1)
-                g_warning ("The file '%s' uses the Devhelp index file format version 1, "
-                           "which is deprecated. A future version of Devhelp may remove "
-                           "the support for the format version 1. The index file should "
-                           "be ported to the Devhelp index file format version 2.",
-                           index_file_uri);
+        if (parser->version == FORMAT_VERSION_INVALID) {
+                g_set_error_literal (error, DH_ERROR, DH_ERROR_UNSUPPORTED_FORMAT,
+                                     "Unsupported Devhelp index file format");
+                ok = FALSE;
+                goto exit;
+        }
 
         if (gz) {
                 GZlibDecompressor *zlib_decompressor;
diff --git a/devhelp/dh-util-lib.c b/devhelp/dh-util-lib.c
index 15a5c060..5fd8cc44 100644
--- a/devhelp/dh-util-lib.c
+++ b/devhelp/dh-util-lib.c
@@ -167,8 +167,6 @@ _dh_util_get_possible_index_files (GFile *book_directory)
         const gchar *extensions[] = {
                 ".devhelp2",
                 ".devhelp2.gz",
-                ".devhelp",
-                ".devhelp.gz",
                 NULL
         };
         gchar *directory_name;
diff --git a/unit-tests/test-util.c b/unit-tests/test-util.c
index d83f8c4a..6b9e7ce2 100644
--- a/unit-tests/test-util.c
+++ b/unit-tests/test-util.c
@@ -17,7 +17,7 @@ check_get_possible_index_files (const gchar *book_directory_path,
         book_directory = g_file_new_for_path (book_directory_path);
         list = _dh_util_get_possible_index_files (book_directory);
 
-        g_assert_cmpint (g_slist_length (list), ==, 4);
+        g_assert_cmpint (g_slist_length (list), ==, 2);
 
         for (l = list, i = 0; l != NULL; l = l->next, i++) {
                 GFile *index_file = G_FILE (l->data);
@@ -35,14 +35,6 @@ check_get_possible_index_files (const gchar *book_directory_path,
                                 expected_basename = g_strconcat (book_basename, ".devhelp2.gz", NULL);
                                 break;
 
-                        case 2:
-                                expected_basename = g_strconcat (book_basename, ".devhelp", NULL);
-                                break;
-
-                        case 3:
-                                expected_basename = g_strconcat (book_basename, ".devhelp.gz", NULL);
-                                break;
-
                         default:
                                 g_assert_not_reached ();
                 }