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git-svn-id: http://svn.irssi.org/repos/irssi/trunk@358 dbcabf3a-b0e7-0310-adc4-f8d773084564

src/fe-common/core/completion.c

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+/*
+ completion.c : irssi
+
+    Copyright (C) 2000 Timo Sirainen
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include "module.h"
+#include "signals.h"
+#include "commands.h"
+#include "lib-config/iconfig.h"
+#include "settings.h"
+
+#include "completion.h"
+
+#define wordreplace_find(replace) \
+	iconfig_list_find("replaces", "text", replace, "replace")
+
+#define completion_find(completion) \
+	iconfig_list_find("completions", "short", completion, "long")
+
+static GList *complist; /* list of commands we're currently completing */
+static char *last_linestart;
+
+#define isseparator_notspace(c) \
+        ((c) == ',')
+
+#define isseparator(c) \
+	(isspace((int) (c)) || isseparator_notspace(c))
+
+/* Return whole word at specified position in string */
+char *get_word_at(const char *str, int pos, char **startpos)
+{
+	const char *start, *end;
+
+	g_return_val_if_fail(str != NULL, NULL);
+	g_return_val_if_fail(pos >= 0, NULL);
+
+	/* get previous word if char at `pos' is space */
+	start = str+pos;
+	while (start > str && isseparator(start[-1])) start--;
+
+	end = start;
+	while (start > str && !isseparator(start[-1])) start--;
+	while (*end != '\0' && !isseparator(*end)) end++;
+	while (*end != '\0' && isseparator_notspace(*end)) end++;
+
+	*startpos = (char *) start;
+	return g_strndup(start, (int) (end-start));
+}
+
+/* automatic word completion - called when space/enter is pressed */
+char *auto_word_complete(const char *line, int *pos)
+{
+	GString *result;
+	const char *replace;
+	char *word, *wordstart, *ret;
+	int startpos;
+
+	g_return_val_if_fail(line != NULL, NULL);
+	g_return_val_if_fail(pos != NULL, NULL);
+
+	word = get_word_at(line, *pos, &wordstart);
+	startpos = (int) (wordstart-line);
+
+	result = g_string_new(line);
+	g_string_erase(result, startpos, strlen(word));
+
+	/* check for words in autocompletion list */
+	replace = wordreplace_find(word);
+	if (replace == NULL) {
+		ret = NULL;
+		g_string_free(result, TRUE);
+	} else {
+		*pos = startpos+strlen(replace);
+
+		g_string_insert(result, startpos, replace);
+		ret = result->str;
+		g_string_free(result, FALSE);
+	}
+
+	g_free(word);
+	return ret;
+}
+
+static void free_completions(void)
+{
+	complist = g_list_first(complist);
+
+	g_list_foreach(complist, (GFunc) g_free, NULL);
+	g_list_free(complist);
+        complist = NULL;
+
+	g_free_and_null(last_linestart);
+}
+
+/* manual word completion - called when TAB is pressed */
+char *word_complete(WINDOW_REC *window, const char *line, int *pos)
+{
+	GString *result;
+	char *word, *wordstart, *linestart, *ret;
+	int startpos, wordlen;
+
+	g_return_val_if_fail(line != NULL, NULL);
+	g_return_val_if_fail(pos != NULL, NULL);
+
+	/* get the word we want to complete */
+	word = get_word_at(line, *pos, &wordstart);
+	startpos = (int) (wordstart-line);
+	wordlen = strlen(word);
+
+	/* get the start of line until the word we're completing */
+	while (wordstart > line && isseparator(wordstart[-1])) wordstart--;
+	linestart = g_strndup(line, (int) (wordstart-line));
+
+	if (complist != NULL && strcmp(linestart, last_linestart) == 0 &&
+	    g_strcasecmp(complist->data, word) == 0) {
+		/* complete from old list */
+		complist = complist->next != NULL ? complist->next :
+			g_list_first(complist);
+	} else {
+		/* get new completion list */
+		free_completions();
+
+		last_linestart = g_strdup(linestart);
+		signal_emit("word complete", 4, window, word, linestart, &complist);
+	}
+
+	if (complist == NULL)
+		ret = NULL;
+	else {
+		/* word completed */
+		*pos = startpos+strlen(complist->data)+1;
+
+		/* replace the word in line - we need to return
+		   a full new line */
+		result = g_string_new(line);
+		g_string_erase(result, startpos, wordlen);
+		g_string_insert(result, startpos, complist->data);
+
+		if (!isseparator(result->str[*pos-1]))
+			g_string_insert_c(result, *pos-1, ' ');
+
+		ret = result->str;
+		g_string_free(result, FALSE);
+	}
+
+	g_free(linestart);
+	g_free(word);
+	return ret;
+}
+
+static int is_sub_command(const char *command)
+{
+	GSList *tmp;
+	int len;
+
+	/* find "command "s */
+        len = strlen(command);
+	for (tmp = commands; tmp != NULL; tmp = tmp->next) {
+		COMMAND_REC *rec = tmp->data;
+
+		if (g_strncasecmp(rec->cmd, command, len) == 0 && rec->cmd[len] == ' ')
+			return TRUE;
+	}
+
+	return FALSE;
+}
+
+static GList *completion_get_settings(const char *key)
+{
+	GList *complist;
+	GSList *tmp, *sets;
+	int len;
+
+	sets = settings_get_sorted();
+
+	len = strlen(key);
+	complist = NULL;
+	for (tmp = sets; tmp != NULL; tmp = tmp->next) {
+		SETTINGS_REC *rec = tmp->data;
+
+		if (g_strncasecmp(rec->key, key, len) == 0)
+			complist = g_list_append(complist, g_strdup(rec->key));
+	}
+	g_slist_free(sets);
+	return complist;
+}
+
+static GList *completion_get_commands(const char *cmd, char cmdchar)
+{
+	GList *complist;
+	GSList *tmp;
+	int len;
+
+	len = strlen(cmd);
+	complist = NULL;
+	for (tmp = commands; tmp != NULL; tmp = tmp->next) {
+		COMMAND_REC *rec = tmp->data;
+
+		if (strchr(rec->cmd, ' ') != NULL)
+			continue;
+
+		if (g_strncasecmp(rec->cmd, cmd, len) == 0)
+			complist = g_list_append(complist, g_strdup_printf("%c%s", cmdchar, rec->cmd));
+	}
+	return complist;
+}
+
+static GList *completion_get_subcommands(const char *cmd)
+{
+	GList *complist;
+	GSList *tmp;
+	char *spacepos;
+	int len, skip;
+
+	/* get the number of chars to skip at the start of command. */
+	spacepos = strchr(cmd, ' ');
+	skip = spacepos == NULL ? 0 :
+		((int) (spacepos-cmd) + 1);
+
+	len = strlen(cmd);
+	complist = NULL;
+	for (tmp = commands; tmp != NULL; tmp = tmp->next) {
+		COMMAND_REC *rec = tmp->data;
+
+		if (strlen(rec->cmd) < len)
+			continue;
+
+		if (strchr(rec->cmd+len, ' ') != NULL)
+			continue;
+
+		if (g_strncasecmp(rec->cmd, cmd, len) == 0)
+			complist = g_list_append(complist, g_strdup(rec->cmd+skip));
+	}
+	return complist;
+}
+
+static void sig_word_complete(WINDOW_REC *window, const char *word,
+			      const char *linestart, GList **list)
+{
+	const char *newword, *cmdchars;
+
+	g_return_if_fail(word != NULL);
+
+	/* check against "completion words" list */
+	newword = completion_find(word);
+	if (newword != NULL) {
+		*list = g_list_append(*list, g_strdup(newword));
+
+		signal_stop();
+		return;
+	}
+
+	/* /SET variable name completion */
+	if (g_strcasecmp(linestart, "/SET") == 0) {
+		*list = completion_get_settings(word);
+
+		if (*list != NULL) signal_stop();
+		return;
+	}
+
+	/* command completion? */
+	cmdchars = settings_get_str("cmdchars");
+	if (strchr(cmdchars, *word) && *linestart == '\0') {
+		/* complete /command */
+		*list = completion_get_commands(word+1, *word);
+
+		if (*list != NULL) signal_stop();
+		return;
+	}
+
+	if (strchr(cmdchars, *linestart) && is_sub_command(linestart+1)) {
+		/* complete (/command's) subcommand */
+		char *tmp;
+
+                tmp = g_strconcat(linestart+1, " ", word, NULL);
+		*list = completion_get_subcommands(tmp);
+		g_free(tmp);
+
+		if (*list != NULL) signal_stop();
+		return;
+	}
+}
+
+void completion_init(void)
+{
+	complist = NULL;
+	last_linestart = NULL;
+
+	signal_add("word complete", (SIGNAL_FUNC) sig_word_complete);
+}
+
+void completion_deinit(void)
+{
+        free_completions();
+
+	signal_remove("word complete", (SIGNAL_FUNC) sig_word_complete);
+}