X-Git-Url: https://git.toastfreeware.priv.at/gregoa/bti.git/blobdiff_plain/e67f72404840f2e46d20edfe043a41b33e6c8562..fd562ddb1a223ca6623c05761305a103e6a85dfb:/bti.c

diff --git a/bti.c b/bti.c
index bd311cd..ae32c37 100644
--- a/bti.c
+++ b/bti.c
@@ -1,5 +1,7 @@
 /*
  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
+ * Copyright (C) 2009 Amir Mohammad Saied <amirsaied@gmail.com>
  *
  * 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
@@ -15,6 +17,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 
+#define _GNU_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stddef.h>
@@ -26,12 +30,15 @@
 #include <unistd.h>
 #include <time.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 #include <curl/curl.h>
-#include <readline/readline.h>
 #include <libxml/xmlmemory.h>
 #include <libxml/parser.h>
 #include <libxml/tree.h>
-#include "bti_version.h"
+#include <pcre.h>
+#include <termios.h>
+#include <dlfcn.h>
 
 
 #define zalloc(size)	calloc(size, 1)
@@ -39,23 +46,28 @@
 #define dbg(format, arg...)						\
 	do {								\
 		if (debug)						\
-			printf("%s: " format , __func__ , ## arg);	\
+			fprintf(stdout, "bti: %s: " format , __func__ , \
+				## arg);				\
 	} while (0)
 
 
 static int debug;
+static int verbose;
 
 enum host {
-	HOST_TWITTER = 0,
+	HOST_TWITTER  = 0,
 	HOST_IDENTICA = 1,
+	HOST_CUSTOM   = 2
 };
 
 enum action {
-	ACTION_UPDATE = 0,
+	ACTION_UPDATE  = 0,
 	ACTION_FRIENDS = 1,
-	ACTION_USER = 2,
+	ACTION_USER    = 2,
 	ACTION_REPLIES = 4,
-	ACTION_PUBLIC = 8
+	ACTION_PUBLIC  = 8,
+	ACTION_GROUP   = 16,
+	ACTION_UNKNOWN = 32
 };
 
 struct session {
@@ -67,9 +79,20 @@ struct session {
 	char *homedir;
 	char *logfile;
 	char *user;
+	char *group;
+	char *hosturl;
+	char *hostname;
+	char *configfile;
+	char *replyto;
 	int bash;
+	int interactive;
+	int shrink_urls;
+	int dry_run;
+	int page;
 	enum host host;
 	enum action action;
+	void *readline_handle;
+	char *(*readline)(const char *);
 };
 
 struct bti_curl_buffer {
@@ -80,27 +103,132 @@ struct bti_curl_buffer {
 
 static void display_help(void)
 {
-	fprintf(stdout, "bti - send tweet to twitter\n");
-	fprintf(stdout, "Version: " BTI_VERSION "\n");
+	fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
+	fprintf(stdout, "Version: " VERSION "\n");
 	fprintf(stdout, "Usage:\n");
 	fprintf(stdout, "  bti [options]\n");
 	fprintf(stdout, "options are:\n");
 	fprintf(stdout, "  --account accountname\n");
 	fprintf(stdout, "  --password password\n");
+	fprintf(stdout, "  --action action\n");
+	fprintf(stdout, "    ('update', 'friends', 'public', 'replies', "
+		"'group' or 'user')\n");
+	fprintf(stdout, "  --user screenname\n");
+	fprintf(stdout, "  --group groupname\n");
 	fprintf(stdout, "  --proxy PROXY:PORT\n");
 	fprintf(stdout, "  --host HOST\n");
 	fprintf(stdout, "  --logfile logfile\n");
+	fprintf(stdout, "  --config configfile\n");
+	fprintf(stdout, "  --replyto ID\n");
+	fprintf(stdout, "  --shrink-urls\n");
+	fprintf(stdout, "  --page PAGENUMBER\n");
 	fprintf(stdout, "  --bash\n");
-	fprintf(stdout, "  --action action\n");
-	fprintf(stdout, "  --user screenname\n");
 	fprintf(stdout, "  --debug\n");
+	fprintf(stdout, "  --verbose\n");
+	fprintf(stdout, "  --dry-run\n");
 	fprintf(stdout, "  --version\n");
 	fprintf(stdout, "  --help\n");
 }
 
 static void display_version(void)
 {
-	fprintf(stdout, "bti - version %s\n", BTI_VERSION);
+	fprintf(stdout, "bti - version %s\n", VERSION);
+}
+
+static char *get_string(const char *name)
+{
+	char *temp;
+	char *string;
+
+	string = zalloc(1000);
+	if (!string)
+		exit(1);
+	if (name != NULL)
+		fprintf(stdout, "%s", name);
+	if (!fgets(string, 999, stdin))
+		return NULL;
+	temp = strchr(string, '\n');
+	if (temp)
+		*temp = '\0';
+	return string;
+}
+
+/*
+ * Try to get a handle to a readline function from a variety of different
+ * libraries.  If nothing is present on the system, then fall back to an
+ * internal one.
+ *
+ * Logic originally based off of code in the e2fsutils package in the
+ * lib/ss/get_readline.c file, which is licensed under the MIT license.
+ *
+ * This keeps us from having to relicense the bti codebase if readline
+ * ever changes its license, as there is no link-time dependancy.
+ * It is a run-time thing only, and we handle any readline-like library
+ * in the same manner, making bti not be a derivative work of any
+ * other program.
+ */
+static void session_readline_init(struct session *session)
+{
+	/* Libraries we will try to use for readline/editline functionality */
+	const char *libpath = "libreadline.so.6:libreadline.so.5:"
+				"libreadline.so.4:libreadline.so:libedit.so.2:"
+				"libedit.so:libeditline.so.0:libeditline.so";
+	void *handle = NULL;
+	char *tmp, *cp, *next;
+	int (*bind_key)(int, void *);
+	void (*insert)(void);
+
+	/* default to internal function if we can't or won't find anything */
+	session->readline = get_string;
+	if (!isatty(0))
+		return;
+	session->interactive = 1;
+
+	tmp = malloc(strlen(libpath)+1);
+	if (!tmp)
+		return;
+	strcpy(tmp, libpath);
+	for (cp = tmp; cp; cp = next) {
+		next = strchr(cp, ':');
+		if (next)
+			*next++ = 0;
+		if (*cp == 0)
+			continue;
+		handle = dlopen(cp, RTLD_NOW);
+		if (handle) {
+			dbg("Using %s for readline library\n", cp);
+			break;
+		}
+	}
+	free(tmp);
+	if (!handle) {
+		dbg("No readline library found.\n");
+		return;
+	}
+
+	session->readline_handle = handle;
+	session->readline = (char *(*)(const char *))dlsym(handle, "readline");
+	if (session->readline == NULL) {
+		/* something odd happened, default back to internal stuff */
+		session->readline_handle = NULL;
+		session->readline = get_string;
+		return;
+	}
+
+	/*
+	 * If we found a library, turn off filename expansion
+	 * as that makes no sense from within bti.
+	 */
+	bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
+	insert = (void (*)(void))dlsym(handle, "rl_insert");
+	if (bind_key && insert)
+		bind_key('\t', insert);
+}
+
+static void session_readline_cleanup(struct session *session)
+{
+	if (session->readline_handle)
+		dlclose(session->readline_handle);
 }
 
 static struct session *session_alloc(void)
@@ -117,6 +245,7 @@ static void session_free(struct session *session)
 {
 	if (!session)
 		return;
+	free(session->replyto);
 	free(session->password);
 	free(session->account);
 	free(session->tweet);
@@ -124,6 +253,10 @@ static void session_free(struct session *session)
 	free(session->time);
 	free(session->homedir);
 	free(session->user);
+	free(session->group);
+	free(session->hosturl);
+	free(session->hostname);
+	free(session->configfile);
 	free(session);
 }
 
@@ -155,17 +288,17 @@ static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 	free(buffer);
 }
 
-static const char *twitter_user_url    = "http://twitter.com/statuses/user_timeline/";
-static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
-static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
-static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
-static const char *twitter_replies_url = "http://twitter.com/statuses/replies.xml";
+static const char *twitter_host  = "https://twitter.com/statuses";
+static const char *identica_host = "https://identi.ca/api/statuses";
+static const char *twitter_name  = "twitter";
+static const char *identica_name = "identi.ca";
 
-static const char *identica_user_url    = "http://identi.ca/api/statuses/user_timeline/";
-static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
-static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
-static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
-static const char *identica_replies_url = "http://identi.ca/api/statuses/replies.xml";
+static const char *user_uri    = "/user_timeline/";
+static const char *update_uri  = "/update.xml";
+static const char *public_uri  = "/public_timeline.xml";
+static const char *friends_uri = "/friends_timeline.xml";
+static const char *replies_uri = "/replies.xml";
+static const char *group_uri = "/../laconica/groups/timeline/";
 
 static CURL *curl_init(void)
 {
@@ -182,17 +315,23 @@ static CURL *curl_init(void)
 	return curl;
 }
 
-void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
+static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 {
 	xmlChar *text = NULL;
 	xmlChar *user = NULL;
+	xmlChar *created = NULL;
+	xmlChar *id = NULL;
 	xmlNodePtr userinfo;
 
 	current = current->xmlChildrenNode;
 	while (current != NULL) {
 		if (current->type == XML_ELEMENT_NODE) {
+			if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
+				created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 			if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 				text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
+			if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
+				id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 			if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 				userinfo = current->xmlChildrenNode;
 				while (userinfo != NULL) {
@@ -204,12 +343,22 @@ void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 					userinfo = userinfo->next;
 				}
 			}
-			if (user && text) {
-				printf("[%s] %s\n", user, text);
+
+			if (user && text && created && id) {
+				if (verbose)
+					printf("[%s] {%s} (%.16s) %s\n",
+						user, id, created, text);
+				else
+					printf("[%s] %s\n",
+						user, text);
 				xmlFree(user);
 				xmlFree(text);
+				xmlFree(created);
+				xmlFree(id);
 				user = NULL;
 				text = NULL;
+				created = NULL;
+				id = NULL;
 			}
 		}
 		current = current->next;
@@ -222,8 +371,9 @@ static void parse_timeline(char *document)
 {
 	xmlDocPtr doc;
 	xmlNodePtr current;
-	doc = xmlReadMemory(document, strlen(document), "timeline.xml", NULL, XML_PARSE_NOERROR);
 
+	doc = xmlReadMemory(document, strlen(document), "timeline.xml",
+			    NULL, XML_PARSE_NOERROR);
 	if (doc == NULL)
 		return;
 
@@ -251,7 +401,8 @@ static void parse_timeline(char *document)
 	return;
 }
 
-size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
+static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
+			    void *userp)
 {
 	struct bti_curl_buffer *curl_buf = userp;
 	size_t buffer_size = size * nmemb;
@@ -280,10 +431,9 @@ size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 
 static int send_request(struct session *session)
 {
+	char endpoint[100];
 	char user_password[500];
 	char data[500];
-	/* is there usernames longer than 22 chars? */
-	char user_url[70];
 	struct bti_curl_buffer *curl_buf;
 	CURL *curl = NULL;
 	CURLcode res;
@@ -302,6 +452,9 @@ static int send_request(struct session *session)
 	if (!curl)
 		return -EINVAL;
 
+	if (!session->hosturl)
+		session->hosturl = strdup(twitter_host);
+
 	switch (session->action) {
 	case ACTION_UPDATE:
 		snprintf(user_password, sizeof(user_password), "%s:%s",
@@ -317,71 +470,58 @@ static int send_request(struct session *session)
 			     CURLFORM_COPYCONTENTS, "bti",
 			     CURLFORM_END);
 
+		if (session->replyto)
+			curl_formadd(&formpost, &lastptr,
+				     CURLFORM_COPYNAME, "in_reply_to_status_id",
+				     CURLFORM_COPYCONTENTS, session->replyto,
+				     CURLFORM_END);
+
 		curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 		slist = curl_slist_append(slist, "Expect:");
 		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
-		switch (session->host) {
-		case HOST_TWITTER:
-			curl_easy_setopt(curl, CURLOPT_URL, twitter_update_url);
-			break;
-		case HOST_IDENTICA:
-			curl_easy_setopt(curl, CURLOPT_URL, identica_update_url);
-			break;
-		}
+
+		sprintf(endpoint, "%s%s", session->hosturl, update_uri);
+		curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 		curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 
 		break;
 	case ACTION_FRIENDS:
 		snprintf(user_password, sizeof(user_password), "%s:%s",
 			 session->account, session->password);
-		switch (session->host) {
-		case HOST_TWITTER:
-			curl_easy_setopt(curl, CURLOPT_URL, twitter_friends_url);
-			break;
-		case HOST_IDENTICA:
-			curl_easy_setopt(curl, CURLOPT_URL, identica_friends_url);
-			break;
-		}
+		sprintf(endpoint, "%s%s?page=%d", session->hosturl,
+			friends_uri, session->page);
+		curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 		curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 
 		break;
 	case ACTION_USER:
-		switch (session->host) {
-		case HOST_TWITTER:
-			sprintf(user_url, "%s%s.xml", twitter_user_url, session->user);
-			curl_easy_setopt(curl, CURLOPT_URL, user_url);
-			break;
-		case HOST_IDENTICA:
-			sprintf(user_url, "%s%s.xml", identica_user_url, session->user);
-			curl_easy_setopt(curl, CURLOPT_URL, user_url);
-			break;
-		}
+		sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
+			user_uri, session->user, session->page);
+		curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 
 		break;
 	case ACTION_REPLIES:
 		snprintf(user_password, sizeof(user_password), "%s:%s",
 			 session->account, session->password);
-		switch (session->host) {
-		case HOST_TWITTER:
-			curl_easy_setopt(curl, CURLOPT_URL, twitter_replies_url);
-			break;
-		case HOST_IDENTICA:
-			curl_easy_setopt(curl, CURLOPT_URL, identica_replies_url);
-			break;
-		}
+		sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri,
+			session->page);
+		curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 		curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 
 		break;
 	case ACTION_PUBLIC:
-		switch (session->host) {
-		case HOST_TWITTER:
-			curl_easy_setopt(curl, CURLOPT_URL, twitter_public_url);
-			break;
-		case HOST_IDENTICA:
-			curl_easy_setopt(curl, CURLOPT_URL, identica_public_url);
-			break;
-		}
+		sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri,
+			session->page);
+		curl_easy_setopt(curl, CURLOPT_URL, endpoint);
+
+		break;
+	case ACTION_GROUP:
+		sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
+				group_uri, session->group, session->page);
+		curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 
+		break;
+	default:
 		break;
 	}
 
@@ -397,10 +537,13 @@ static int send_request(struct session *session)
 
 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 	curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
-	res = curl_easy_perform(curl);
-	if (res && !session->bash) {
-		fprintf(stderr, "error(%d) trying to perform operation\n", res);
-		return -EINVAL;
+	if (!session->dry_run) {
+		res = curl_easy_perform(curl);
+		if (res && !session->bash) {
+			fprintf(stderr, "error(%d) trying to perform "
+				"operation\n", res);
+			return -EINVAL;
+		}
 	}
 
 	curl_easy_cleanup(curl);
@@ -423,13 +566,9 @@ static void parse_configfile(struct session *session)
 	char *action = NULL;
 	char *user = NULL;
 	char *file;
+	int shrink_urls = 0;
 
-	/* config file is ~/.bti  */
-	file = alloca(strlen(session->homedir) + 7);
-
-	sprintf(file, "%s/.bti", session->homedir);
-
-	config_file = fopen(file, "r");
+	config_file = fopen(session->configfile, "r");
 
 	/* No error if file does not exist or is unreadable.  */
 	if (config_file == NULL)
@@ -488,6 +627,18 @@ static void parse_configfile(struct session *session)
 			c += 5;
 			if (c[0] != '\0')
 				user = strdup(c);
+		} else if (!strncasecmp(c, "shrink-urls", 11) &&
+				(c[11] == '=')) {
+			c += 12;
+			if (!strncasecmp(c, "true", 4) ||
+					!strncasecmp(c, "yes", 3))
+				shrink_urls = 1;
+		} else if (!strncasecmp(c, "verbose", 7) &&
+				(c[7] == '=')) {
+			c += 8;
+			if (!strncasecmp(c, "true", 4) ||
+					!strncasecmp(c, "yes", 3))
+				verbose = 1;
 		}
 	} while (!feof(config_file));
 
@@ -496,10 +647,19 @@ static void parse_configfile(struct session *session)
 	if (account)
 		session->account = account;
 	if (host) {
-		if (strcasecmp(host, "twitter") == 0)
+		if (strcasecmp(host, "twitter") == 0) {
 			session->host = HOST_TWITTER;
-		if (strcasecmp(host, "identica") == 0)
+			session->hosturl = strdup(twitter_host);
+			session->hostname = strdup(twitter_name);
+		} else if (strcasecmp(host, "identica") == 0) {
 			session->host = HOST_IDENTICA;
+			session->hosturl = strdup(identica_host);
+			session->hostname = strdup(identica_name);
+		} else {
+			session->host = HOST_CUSTOM;
+			session->hosturl = strdup(host);
+			session->hostname = strdup(host);
+		}
 		free(host);
 	}
 	if (proxy) {
@@ -512,19 +672,23 @@ static void parse_configfile(struct session *session)
 	if (action) {
 		if (strcasecmp(action, "update") == 0)
 			session->action = ACTION_UPDATE;
-		if (strcasecmp(action, "friends") == 0)
+		else if (strcasecmp(action, "friends") == 0)
 			session->action = ACTION_FRIENDS;
-		if (strcasecmp(action, "user") == 0)
+		else if (strcasecmp(action, "user") == 0)
 			session->action = ACTION_USER;
-		if (strcasecmp(action, "replies") == 0)
+		else if (strcasecmp(action, "replies") == 0)
 			session->action = ACTION_REPLIES;
-		if (strcasecmp(action, "public") == 0)
+		else if (strcasecmp(action, "public") == 0)
 			session->action = ACTION_PUBLIC;
+		else if (strcasecmp(action, "group") == 0)
+			session->action = ACTION_GROUP;
+		else
+			session->action = ACTION_UNKNOWN;
 		free(action);
 	}
-	if (user) {
+	if (user)
 		session->user = user;
-	}
+	session->shrink_urls = shrink_urls;
 
 	/* Free buffer and close file.  */
 	free(line);
@@ -535,7 +699,6 @@ static void log_session(struct session *session, int retval)
 {
 	FILE *log_file;
 	char *filename;
-	char *host;
 
 	/* Only log something if we have a log file set */
 	if (!session->logfile)
@@ -549,62 +712,384 @@ static void log_session(struct session *session, int retval)
 	log_file = fopen(filename, "a+");
 	if (log_file == NULL)
 		return;
-	switch (session->host) {
-	case HOST_TWITTER:
-		host = "twitter";
-		break;
-	case HOST_IDENTICA:
-		host = "identi.ca";
-		break;
-	default:
-		host = "unknown";
-		break;
-	}
 
-	if (session->action == ACTION_UPDATE) {
+	switch (session->action) {
+	case ACTION_UPDATE:
 		if (retval)
 			fprintf(log_file, "%s: host=%s tweet failed\n",
-				session->time, host);
+				session->time, session->hostname);
 		else
 			fprintf(log_file, "%s: host=%s tweet=%s\n",
-				session->time, host, session->tweet);
-	} else if (session->action == ACTION_FRIENDS) {
+				session->time, session->hostname,
+				session->tweet);
+		break;
+	case ACTION_FRIENDS:
 		fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
-			session->time, host);
-	} else if (session->action == ACTION_PUBLIC) {
+			session->time, session->hostname);
+		break;
+	case ACTION_USER:
+		fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
+			session->time, session->hostname, session->user);
+		break;
+	case ACTION_REPLIES:
+		fprintf(log_file, "%s: host=%s retrieving replies\n",
+			session->time, session->hostname);
+		break;
+	case ACTION_PUBLIC:
 		fprintf(log_file, "%s: host=%s retrieving public timeline\n",
-			session->time, host);
+			session->time, session->hostname);
+		break;
+	case ACTION_GROUP:
+		fprintf(log_file, "%s: host=%s retrieving group timeline\n",
+			session->time, session->hostname);
+		break;
+	default:
+		break;
 	}
 
 	fclose(log_file);
 }
 
+static char *get_string_from_stdin(void)
+{
+	char *temp;
+	char *string;
+
+	string = zalloc(1000);
+	if (!string)
+		return NULL;
+
+	if (!fgets(string, 999, stdin))
+		return NULL;
+	temp = strchr(string, '\n');
+	if (temp)
+		*temp = '\0';
+	return string;
+}
+
+static void read_password(char *buf, size_t len, char *host)
+{
+	char pwd[80];
+	int retval;
+	struct termios old;
+	struct termios tp;
+
+	tcgetattr(0, &tp);
+	old = tp;
+
+	tp.c_lflag &= (~ECHO);
+	tcsetattr(0, TCSANOW, &tp);
+
+	fprintf(stdout, "Enter password for %s: ", host);
+	fflush(stdout);
+	tcflow(0, TCOOFF);
+	retval = scanf("%79s", pwd);
+	tcflow(0, TCOON);
+	fprintf(stdout, "\n");
+
+	tcsetattr(0, TCSANOW, &old);
+
+	strncpy(buf, pwd, len);
+	buf[len-1] = '\0';
+}
+
+static int find_urls(const char *tweet, int **pranges)
+{
+	/*
+	 * magic obtained from
+	 * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
+	 */
+	static const char *re_magic =
+		"(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
+		"[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
+		"(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
+	pcre *re;
+	const char *errptr;
+	int erroffset;
+	int ovector[10] = {0,};
+	const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
+	int startoffset, tweetlen;
+	int i, rc;
+	int rbound = 10;
+	int rcount = 0;
+	int *ranges = malloc(sizeof(int) * rbound);
+
+	re = pcre_compile(re_magic,
+			PCRE_NO_AUTO_CAPTURE,
+			&errptr, &erroffset, NULL);
+	if (!re) {
+		fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
+		exit(1);
+	}
+
+	tweetlen = strlen(tweet);
+	for (startoffset = 0; startoffset < tweetlen; ) {
+
+		rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
+				ovector, ovsize);
+		if (rc == PCRE_ERROR_NOMATCH)
+			break;
+
+		if (rc < 0) {
+			fprintf(stderr, "pcre_exec @%u: %s\n",
+				erroffset, errptr);
+			exit(1);
+		}
+
+		for (i = 0; i < rc; i += 2) {
+			if ((rcount+2) == rbound) {
+				rbound *= 2;
+				ranges = realloc(ranges, sizeof(int) * rbound);
+			}
+
+			ranges[rcount++] = ovector[i];
+			ranges[rcount++] = ovector[i+1];
+		}
+
+		startoffset = ovector[1];
+	}
+
+	pcre_free(re);
+
+	*pranges = ranges;
+	return rcount;
+}
+
+/**
+ * bidirectional popen() call
+ *
+ * @param rwepipe - int array of size three
+ * @param exe - program to run
+ * @param argv - argument list
+ * @return pid or -1 on error
+ *
+ * The caller passes in an array of three integers (rwepipe), on successful
+ * execution it can then write to element 0 (stdin of exe), and read from
+ * element 1 (stdout) and 2 (stderr).
+ */
+static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
+{
+	int in[2];
+	int out[2];
+	int err[2];
+	int pid;
+	int rc;
+
+	rc = pipe(in);
+	if (rc < 0)
+		goto error_in;
+
+	rc = pipe(out);
+	if (rc < 0)
+		goto error_out;
+
+	rc = pipe(err);
+	if (rc < 0)
+		goto error_err;
+
+	pid = fork();
+	if (pid > 0) {
+		/* parent */
+		close(in[0]);
+		close(out[1]);
+		close(err[1]);
+		rwepipe[0] = in[1];
+		rwepipe[1] = out[0];
+		rwepipe[2] = err[0];
+		return pid;
+	} else if (pid == 0) {
+		/* child */
+		close(in[1]);
+		close(out[0]);
+		close(err[0]);
+		close(0);
+		rc = dup(in[0]);
+		close(1);
+		rc = dup(out[1]);
+		close(2);
+		rc = dup(err[1]);
+
+		execvp(exe, (char **)argv);
+		exit(1);
+	} else
+		goto error_fork;
+
+	return pid;
+
+error_fork:
+	close(err[0]);
+	close(err[1]);
+error_err:
+	close(out[0]);
+	close(out[1]);
+error_out:
+	close(in[0]);
+	close(in[1]);
+error_in:
+	return -1;
+}
+
+static int pcloseRWE(int pid, int *rwepipe)
+{
+	int rc, status;
+	close(rwepipe[0]);
+	close(rwepipe[1]);
+	close(rwepipe[2]);
+	rc = waitpid(pid, &status, 0);
+	return status;
+}
+
+static char *shrink_one_url(int *rwepipe, char *big)
+{
+	int biglen = strlen(big);
+	char *small;
+	int smalllen;
+	int rc;
+
+	rc = dprintf(rwepipe[0], "%s\n", big);
+	if (rc < 0)
+		return big;
+
+	smalllen = biglen + 128;
+	small = malloc(smalllen);
+	if (!small)
+		return big;
+
+	rc = read(rwepipe[1], small, smalllen);
+	if (rc < 0 || rc > biglen)
+		goto error_free_small;
+
+	if (strncmp(small, "http://", 7))
+		goto error_free_small;
+
+	smalllen = rc;
+	while (smalllen && isspace(small[smalllen-1]))
+			small[--smalllen] = 0;
+
+	free(big);
+	return small;
+
+error_free_small:
+	free(small);
+	return big;
+}
+
+static char *shrink_urls(char *text)
+{
+	int *ranges;
+	int rcount;
+	int i;
+	int inofs = 0;
+	int outofs = 0;
+	const char *const shrink_args[] = {
+		"bti-shrink-urls",
+		NULL
+	};
+	int shrink_pid;
+	int shrink_pipe[3];
+	int inlen = strlen(text);
+
+	dbg("before len=%u\n", inlen);
+
+	shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
+	if (shrink_pid < 0)
+		return text;
+
+	rcount = find_urls(text, &ranges);
+	if (!rcount)
+		return text;
+
+	for (i = 0; i < rcount; i += 2) {
+		int url_start = ranges[i];
+		int url_end = ranges[i+1];
+		int long_url_len = url_end - url_start;
+		char *url = strndup(text + url_start, long_url_len);
+		int short_url_len;
+		int not_url_len = url_start - inofs;
+
+		dbg("long  url[%u]: %s\n", long_url_len, url);
+		url = shrink_one_url(shrink_pipe, url);
+		short_url_len = url ? strlen(url) : 0;
+		dbg("short url[%u]: %s\n", short_url_len, url);
+
+		if (!url || short_url_len >= long_url_len) {
+			/* The short url ended up being too long
+			 * or unavailable */
+			if (inofs) {
+				strncpy(text + outofs, text + inofs,
+						not_url_len + long_url_len);
+			}
+			inofs += not_url_len + long_url_len;
+			outofs += not_url_len + long_url_len;
+
+		} else {
+			/* copy the unmodified block */
+			strncpy(text + outofs, text + inofs, not_url_len);
+			inofs += not_url_len;
+			outofs += not_url_len;
+
+			/* copy the new url */
+			strncpy(text + outofs, url, short_url_len);
+			inofs += long_url_len;
+			outofs += short_url_len;
+		}
+
+		free(url);
+	}
+
+	/* copy the last block after the last match */
+	if (inofs) {
+		int tail = inlen - inofs;
+		if (tail) {
+			strncpy(text + outofs, text + inofs, tail);
+			outofs += tail;
+		}
+	}
+
+	free(ranges);
+
+	(void)pcloseRWE(shrink_pid, shrink_pipe);
+
+	text[outofs] = 0;
+	dbg("after len=%u\n", outofs);
+	return text;
+}
+
 int main(int argc, char *argv[], char *envp[])
 {
 	static const struct option options[] = {
 		{ "debug", 0, NULL, 'd' },
+		{ "verbose", 0, NULL, 'V' },
 		{ "account", 1, NULL, 'a' },
 		{ "password", 1, NULL, 'p' },
 		{ "host", 1, NULL, 'H' },
 		{ "proxy", 1, NULL, 'P' },
 		{ "action", 1, NULL, 'A' },
 		{ "user", 1, NULL, 'u' },
+		{ "group", 1, NULL, 'G' },
 		{ "logfile", 1, NULL, 'L' },
+		{ "shrink-urls", 0, NULL, 's' },
 		{ "help", 0, NULL, 'h' },
 		{ "bash", 0, NULL, 'b' },
+		{ "dry-run", 0, NULL, 'n' },
+		{ "page", 1, NULL, 'g' },
 		{ "version", 0, NULL, 'v' },
+		{ "config", 1, NULL, 'c' },
+		{ "replyto", 1, NULL, 'r' },
 		{ }
 	};
 	struct session *session;
 	pid_t child;
 	char *tweet;
+	static char password[80];
 	int retval = 0;
 	int option;
 	char *http_proxy;
 	time_t t;
+	int page_nr;
 
 	debug = 0;
-	rl_bind_key('\t', rl_insert);
+	verbose = 0;
 
 	session = session_alloc();
 	if (!session) {
@@ -617,8 +1102,13 @@ int main(int argc, char *argv[], char *envp[])
 	session->time = strdup(ctime(&t));
 	session->time[strlen(session->time)-1] = 0x00;
 
+	/* Get the home directory so we can try to find a config file */
 	session->homedir = strdup(getenv("HOME"));
 
+	/* set up a default config file location (traditionally ~/.bti) */
+	session->configfile = zalloc(strlen(session->homedir) + 7);
+	sprintf(session->configfile, "%s/.bti", session->homedir);
+
 	curl_global_init(CURL_GLOBAL_ALL);
 
 	/* Set environment variables first, before reading command line options
@@ -634,7 +1124,7 @@ int main(int argc, char *argv[], char *envp[])
 	parse_configfile(session);
 
 	while (1) {
-		option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:h",
+		option = getopt_long_only(argc, argv, "dp:P:H:a:A:u:c:hg:G:sr:nVv",
 					  options, NULL);
 		if (option == -1)
 			break;
@@ -642,12 +1132,24 @@ int main(int argc, char *argv[], char *envp[])
 		case 'd':
 			debug = 1;
 			break;
+		case 'V':
+			verbose = 1;
+			break;
 		case 'a':
 			if (session->account)
 				free(session->account);
 			session->account = strdup(optarg);
 			dbg("account = %s\n", session->account);
 			break;
+		case 'g':
+			page_nr = atoi(optarg);
+			dbg("page = %d\n", page_nr);
+			session->page = page_nr;
+			break;
+		case 'r':
+			session->replyto = strdup(optarg);
+			dbg("in_reply_to_status_id = %s\n", session->replyto);
+			break;
 		case 'p':
 			if (session->password)
 				free(session->password);
@@ -663,14 +1165,18 @@ int main(int argc, char *argv[], char *envp[])
 		case 'A':
 			if (strcasecmp(optarg, "update") == 0)
 				session->action = ACTION_UPDATE;
-			if (strcasecmp(optarg, "friends") == 0)
+			else if (strcasecmp(optarg, "friends") == 0)
 				session->action = ACTION_FRIENDS;
-			if (strcasecmp(optarg, "user") == 0)
+			else if (strcasecmp(optarg, "user") == 0)
 				session->action = ACTION_USER;
-			if (strcasecmp(optarg, "replies") == 0)
+			else if (strcasecmp(optarg, "replies") == 0)
 				session->action = ACTION_REPLIES;
-			if (strcasecmp(optarg, "public") == 0)
+			else if (strcasecmp(optarg, "public") == 0)
 				session->action = ACTION_PUBLIC;
+			else if (strcasecmp(optarg, "group") == 0)
+				session->action = ACTION_GROUP;
+			else
+				session->action = ACTION_UNKNOWN;
 			dbg("action = %d\n", session->action);
 			break;
 		case 'u':
@@ -679,25 +1185,63 @@ int main(int argc, char *argv[], char *envp[])
 			session->user = strdup(optarg);
 			dbg("user = %s\n", session->user);
 			break;
+
+		case 'G':
+			if (session->group)
+				free(session->group);
+			session->group = strdup(optarg);
+			dbg("group = %s\n", session->group);
+			break;
 		case 'L':
 			if (session->logfile)
 				free(session->logfile);
 			session->logfile = strdup(optarg);
 			dbg("logfile = %s\n", session->logfile);
 			break;
+		case 's':
+			session->shrink_urls = 1;
+			break;
 		case 'H':
-			if (strcasecmp(optarg, "twitter") == 0)
+			if (session->hosturl)
+				free(session->hosturl);
+			if (session->hostname)
+				free(session->hostname);
+			if (strcasecmp(optarg, "twitter") == 0) {
 				session->host = HOST_TWITTER;
-			if (strcasecmp(optarg, "identica") == 0)
+				session->hosturl = strdup(twitter_host);
+				session->hostname = strdup(twitter_name);
+			} else if (strcasecmp(optarg, "identica") == 0) {
 				session->host = HOST_IDENTICA;
+				session->hosturl = strdup(identica_host);
+				session->hostname = strdup(identica_name);
+			} else {
+				session->host = HOST_CUSTOM;
+				session->hosturl = strdup(optarg);
+				session->hostname = strdup(optarg);
+			}
 			dbg("host = %d\n", session->host);
 			break;
 		case 'b':
 			session->bash = 1;
 			break;
+		case 'c':
+			if (session->configfile)
+				free(session->configfile);
+			session->configfile = strdup(optarg);
+			dbg("configfile = %s\n", session->configfile);
+
+			/*
+			 * read the config file now.  Yes, this could override previously
+			 * set options from the command line, but the user asked for it...
+			 */
+			parse_configfile(session);
+			break;
 		case 'h':
 			display_help();
 			goto exit;
+		case 'n':
+			session->dry_run = 1;
+			break;
 		case 'v':
 			display_version();
 			goto exit;
@@ -707,29 +1251,58 @@ int main(int argc, char *argv[], char *envp[])
 		}
 	}
 
+	session_readline_init(session);
+	/*
+	 * Show the version to make it easier to determine what
+	 * is going on here
+	 */
+	if (debug)
+		display_version();
+
+	if (session->action == ACTION_UNKNOWN) {
+		fprintf(stderr, "Unknown action, valid actions are:\n");
+		fprintf(stderr, "'update', 'friends', 'public', "
+			"'replies', 'group' or 'user'.\n");
+		goto exit;
+	}
+
+	if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
+		fprintf(stderr, "Groups only work in Identi.ca.\n");
+		goto exit;
+	}
+
+	if (session->action == ACTION_GROUP && !session->group) {
+		fprintf(stdout, "Enter group name: ");
+		session->group = session->readline(NULL);
+	}
+
 	if (!session->account) {
-		fprintf(stdout, "Enter twitter account: ");
-		session->account = readline(NULL);
+		fprintf(stdout, "Enter account for %s: ", session->hostname);
+		session->account = session->readline(NULL);
 	}
 
 	if (!session->password) {
-		fprintf(stdout, "Enter twitter password: ");
-		session->password = readline(NULL);
+		read_password(password, sizeof(password), session->hostname);
+		session->password = strdup(password);
 	}
 
 	if (session->action == ACTION_UPDATE) {
-		if (session->bash)
-			tweet = readline(NULL);
+		if (session->bash || !session->interactive)
+			tweet = get_string_from_stdin();
 		else
-			tweet = readline("tweet: ");
+			tweet = session->readline("tweet: ");
 		if (!tweet || strlen(tweet) == 0) {
 			dbg("no tweet?\n");
 			return -1;
 		}
 
+		if (session->shrink_urls)
+			tweet = shrink_urls(tweet);
+
 		session->tweet = zalloc(strlen(tweet) + 10);
 		if (session->bash)
-			sprintf(session->tweet, "$ %s", tweet);
+			sprintf(session->tweet, "%c %s",
+				getuid() ? '$' : '#', tweet);
 		else
 			sprintf(session->tweet, "%s", tweet);
 
@@ -738,8 +1311,11 @@ int main(int argc, char *argv[], char *envp[])
 	}
 
 	if (!session->user)
-		session->user = session->account;
+		session->user = strdup(session->account);
 
+	if (session->page == 0)
+		session->page = 1;
+	dbg("config file = %s\n", session->configfile);
 	dbg("account = %s\n", session->account);
 	dbg("password = %s\n", session->password);
 	dbg("host = %d\n", session->host);
@@ -762,6 +1338,7 @@ int main(int argc, char *argv[], char *envp[])
 
 	log_session(session, retval);
 exit:
+	session_readline_cleanup(session);
 	session_free(session);
 	return retval;;
 }