1 files changed, 226 insertions, 0 deletions
diff --git a/src/tdv-transform.c b/src/tdv-transform.c
new file mode 100644
index 0000000..7520eb8
--- /dev/null
+++ b/src/tdv-transform.c
@@ -0,0 +1,226 @@
+/*
+ * A tool to transform dictionaries dictionaries by an external filter
+ *
+ * The external filter needs to process NUL-separated textual entries.
+ *
+ * Example: tdv-transform input.ifo output -- perl -p0e s/bullshit/soykaf/g
+ *
+ * Copyright (c) 2020, Přemysl Eric Janouch <p@janouch.name>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <locale.h>
+
+#include <glib.h>
+#include <glib/gstdio.h>
+#include <glib-unix.h>
+#include <gio/gio.h>
+
+#include "stardict.h"
+#include "stardict-private.h"
+#include "generator.h"
+#include "utils.h"
+
+enum { PIPE_READ, PIPE_WRITE };
+
+
+// --- Main --------------------------------------------------------------------
+
+static inline void
+print_progress (gulong *last_percent, StardictIterator *iterator, gsize total)
+{
+	gulong percent =
+		(gulong) stardict_iterator_get_offset (iterator) * 100 / total;
+	if (percent != *last_percent)
+	{
+		printf ("\r  Writing entries... %3lu%%", percent);
+		*last_percent = percent;
+	}
+}
+
+static gboolean
+write_to_filter (StardictDict *dict, gint fd, GError **error)
+{
+	StardictInfo *info = stardict_dict_get_info (dict);
+	gsize n_words = stardict_info_get_word_count (info);
+
+	StardictIterator *iterator = stardict_iterator_new (dict, 0);
+	gulong last_percent = -1;
+	while (stardict_iterator_is_valid (iterator))
+	{
+		print_progress (&last_percent, iterator, n_words);
+
+		StardictEntry *entry = stardict_iterator_get_entry (iterator);
+		for (const GList *fields = stardict_entry_get_fields (entry);
+			fields; fields = fields->next)
+		{
+			StardictEntryField *field = fields->data;
+			if (!g_ascii_islower (field->type))
+				continue;
+
+			if (write (fd, field->data, field->data_size)
+				!= (ssize_t) field->data_size)
+			{
+				g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno),
+					"%s", g_strerror (errno));
+				return FALSE;
+			}
+		}
+
+		g_object_unref (entry);
+		stardict_iterator_next (iterator);
+	}
+	printf ("\n");
+	return TRUE;
+}
+
+static gboolean
+update_from_filter (StardictDict *dict, Generator *generator,
+	GMappedFile *filtered_file, GError **error)
+{
+	gchar *filtered = g_mapped_file_get_contents (filtered_file);
+	gchar *filtered_end = filtered + g_mapped_file_get_length (filtered_file);
+
+	StardictInfo *info = stardict_dict_get_info (dict);
+	gsize n_words = stardict_info_get_word_count (info);
+
+	StardictIterator *iterator = stardict_iterator_new (dict, 0);
+	gulong last_percent = -1;
+	while (stardict_iterator_is_valid (iterator))
+	{
+		print_progress (&last_percent, iterator, n_words);
+
+		StardictEntry *entry = stardict_iterator_get_entry (iterator);
+		generator_begin_entry (generator);
+
+		for (GList *fields = entry->fields; fields; fields = fields->next)
+		{
+			StardictEntryField *field = fields->data;
+			if (!g_ascii_islower (field->type))
+				continue;
+
+			gchar *end = memchr (filtered, 0, filtered_end - filtered);
+			if (!end)
+			{
+				g_set_error (error, G_IO_ERROR, G_IO_ERROR_PARTIAL_INPUT,
+					"filter seems to have ended too early");
+				return FALSE;
+			}
+
+			g_free (field->data);
+			field->data = g_strdup (filtered);
+			field->data_size = end - filtered + 1;
+			filtered = end + 1;
+		}
+
+		if (!generator_write_fields (generator, entry->fields, error)
+		 || !generator_finish_entry (generator,
+				stardict_iterator_get_word (iterator), error))
+			return FALSE;
+
+		g_object_unref (entry);
+		stardict_iterator_next (iterator);
+	}
+	printf ("\n");
+	return TRUE;
+}
+
+int
+main (int argc, char *argv[])
+{
+	// The GLib help includes an ellipsis character, for some reason
+	(void) setlocale (LC_ALL, "");
+
+	GError *error = NULL;
+	GOptionContext *ctx = g_option_context_new
+		("input.ifo output-basename -- FILTER [ARG...]");
+	g_option_context_set_summary
+		(ctx, "Transform dictionaries using a filter program.");
+	if (!g_option_context_parse (ctx, &argc, &argv, &error))
+		fatal ("Error: option parsing failed: %s\n", error->message);
+
+	if (argc < 3)
+		fatal ("%s", g_option_context_get_help (ctx, TRUE, NULL));
+
+	// GLib is bullshit, getopt_long() always correctly removes this
+	gint program_argv_start = 3;
+	if (!strcmp (argv[program_argv_start], "--"))
+		program_argv_start++;
+
+	g_option_context_free (ctx);
+
+	printf ("Loading the original dictionary...\n");
+	StardictDict *dict = stardict_dict_new (argv[1], &error);
+	if (!dict)
+		fatal ("Error: opening the dictionary failed: %s\n", error->message);
+
+	printf ("Filtering entries...\n");
+	gint child_in[2];
+	if (!g_unix_open_pipe (child_in, 0, &error))
+		fatal ("g_unix_open_pipe: %s\n", error->message);
+
+	FILE *child_out = tmpfile ();
+	if (!child_out)
+		fatal ("tmpfile: %s\n", g_strerror (errno));
+
+	GPid pid = -1;
+	if (!g_spawn_async_with_fds (NULL /* working_directory */,
+		argv + program_argv_start /* forward a part of ours */, NULL /* envp */,
+		G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
+		NULL /* child_setup */, NULL /* user_data */,
+		&pid, child_in[PIPE_READ], fileno (child_out), STDERR_FILENO, &error))
+		fatal ("g_spawn: %s\n", error->message);
+	if (!write_to_filter (dict, child_in[PIPE_WRITE], &error))
+		fatal ("write_to_filter: %s\n", error->message);
+	if (!g_close (child_in[PIPE_READ], &error)
+	 || !g_close (child_in[PIPE_WRITE], &error))
+		fatal ("g_close: %s\n", error->message);
+
+	printf ("Waiting for the filter to finish...\n");
+	int wstatus = errno = 0;
+	if (waitpid (pid, &wstatus, 0) < 1
+	 || !WIFEXITED (wstatus) || WEXITSTATUS (wstatus) > 0)
+		fatal ("Filter failed (%s, status %d)\n", g_strerror (errno), wstatus);
+
+	GMappedFile *filtered = g_mapped_file_new_from_fd (fileno (child_out),
+		FALSE /* writable */, &error);
+	if (!filtered)
+		fatal ("g_mapped_file_new_from_fd: %s\n", error->message);
+
+	printf ("Writing the new dictionary...\n");
+	Generator *generator = generator_new (argv[2], &error);
+	if (!generator)
+		fatal ("Error: failed to create the output dictionary: %s\n",
+			error->message);
+
+	StardictInfo *info = generator->info;
+	stardict_info_copy (info, stardict_dict_get_info (dict));
+
+	// This gets incremented each time an entry is finished
+	info->word_count = 0;
+
+	if (!update_from_filter (dict, generator, filtered, &error)
+	 || !generator_finish (generator, &error))
+		fatal ("Error: failed to write the dictionary: %s\n", error->message);
+
+	g_mapped_file_unref (filtered);
+	fclose (child_out);
+	generator_free (generator);
+	g_object_unref (dict);
+	return 0;
+}