degesch: add basic autocomplete for /topic

2 files changed, 30 insertions, 1 deletions

diff --git a/NEWS b/NEWS
index fccdfbc..d9ef75e 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,8 @@
 
  * Use TLS Server Name Indication when connecting to servers
 
+ * degesch: added autocomplete for /topic
+
  * degesch: resolve remote addresses asynchronously
 
  * degesch: various bugfixes
diff --git a/degesch.c b/degesch.c
index 7163098..0a8d4b5 100644
--- a/degesch.c
+++ b/degesch.c
@@ -1,7 +1,7 @@
 /*
  * degesch.c: the experimental IRC client
  *
- * Copyright (c) 2015, Přemysl Janouch <p.janouch@gmail.com>
+ * Copyright (c) 2015 - 2016, Přemysl Janouch <p.janouch@gmail.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -10176,6 +10176,29 @@ complete_option (struct app_context *ctx, struct completion *data,
 }
 
 static void
+complete_topic (struct app_context *ctx, struct completion *data,
+	const char *word, struct str_vector *output)
+{
+	(void) data;
+
+	// TODO: make it work in other server-related buffers, too, i.e. when we're
+	//   completing the third word and the second word is a known channel name
+	struct buffer *buffer = ctx->current_buffer;
+	if (buffer->type != BUFFER_CHANNEL)
+		return;
+
+	const char *topic = buffer->channel->topic;
+	if (topic && !strncasecmp_ascii (word, topic, strlen (word)))
+	{
+		// We must prepend the channel name if the topic itself starts
+		// with something that could be regarded as a channel name
+		str_vector_add_owned (output, irc_is_channel (buffer->server, topic)
+			? xstrdup_printf ("%s %s", buffer->channel->name, topic)
+			: xstrdup (topic));
+	}
+}
+
+static void
 complete_nicknames (struct app_context *ctx, struct completion *data,
 	const char *word, struct str_vector *output)
 {
@@ -10208,6 +10231,7 @@ complete_word (struct app_context *ctx, struct completion *data,
 	// First figure out what exactly we need to complete
 	bool try_commands = false;
 	bool try_options = false;
+	bool try_topic = false;
 	bool try_nicknames = false;
 
 	if (data->location == 0 && completion_matches (data, 0, "/*"))
@@ -10216,6 +10240,8 @@ complete_word (struct app_context *ctx, struct completion *data,
 		try_options = true;
 	else if (data->location == 1 && completion_matches (data, 0, "/help"))
 		try_commands = try_options = true;
+	else if (data->location == 1 && completion_matches (data, 0, "/topic"))
+		try_topic = try_nicknames = true;
 	else
 		try_nicknames = true;
 
@@ -10227,6 +10253,7 @@ complete_word (struct app_context *ctx, struct completion *data,
 
 	if (try_commands)   complete_command (ctx, data, word, &words);
 	if (try_options)    complete_option (ctx, data, word, &words);
+	if (try_topic)      complete_topic (ctx, data, word, &words);
 	if (try_nicknames)  complete_nicknames (ctx, data, word, &words);
 
 	if (words.len == 1)