From 24c077f1fb2d72029dd2d80766740dd189af4fc6 Mon Sep 17 00:00:00 2001
From: George Joseph <gjoseph@sangoma.com>
Date: Thu, 9 Jan 2025 15:17:14 -0700
Subject: [PATCH] docs: Enable since/version handling for XML, CLI and ARI
 documentation

* Added the "since" element to the XML configObject and configOption elements
  in appdocsxml.dtd.

* Added the "Since" section to the following CLI output:
  ```
  config show help <module> <object>
  config show help <module> <object> <option>
  core show application <app>
  core show function <func>
  manager show command <command>
  manager show event <event>
  agi show commands topic <topic>
  ```

* Refactored the commands above to output their sections in the same order:
  Synopsis, Since, Description, Syntax, Arguments, SeeAlso

* Refactored the commands above so they all use the same pattern for writing
  the output to the CLI.

* Fixed several memory leaks caused by failure to free temporary output
  buffers.

* Added a "since" array to the mustache template for the top-level resources
  (Channel, Endpoint, etc.) and to the paths/methods underneath them. These
  will be added to the generated markdown if present.
  Example:
  ```
    "resourcePath": "/api-docs/channels.{format}",
    "requiresModules": [
        "res_stasis_answer",
        "res_stasis_playback",
        "res_stasis_recording",
        "res_stasis_snoop"
    ],
    "since": [
        "18.0.0",
        "21.0.0"
    ],
    "apis": [
        {
            "path": "/channels",
            "description": "Active channels",
            "operations": [
                {
                    "httpMethod": "GET",
                    "since": [
                        "18.6.0",
                        "21.8.0"
                    ],
                    "summary": "List all active channels in Asterisk.",
                    "nickname": "list",
                    "responseClass": "List[Channel]"
                },

  ```

NOTE:  No versioning information is actually added in this commit.
Those will be added separately and instructions for adding and maintaining
them will be published on the documentation site at a later date.

(cherry picked from commit 3e28ddce7825776ca5443d8aab632a182ea7346d)
---
 doc/appdocsxml.dtd                   |   4 +-
 include/asterisk/agi.h               |   4 +
 include/asterisk/manager.h           |   1 +
 include/asterisk/pbx.h               |   1 +
 include/asterisk/xmldoc.h            |  12 ++
 main/config_options.c                | 118 ++++++++++++++-----
 main/manager.c                       | 164 ++++++++++++++++-----------
 main/pbx_app.c                       | 102 ++++++++---------
 main/pbx_functions.c                 | 105 +++++++++--------
 main/xmldoc.c                        | 144 +++++++++++++++++++----
 res/res_agi.c                        |  92 +++++++--------
 rest-api-templates/api.wiki.mustache |  12 +-
 rest-api-templates/swagger_model.py  |   6 +
 13 files changed, 493 insertions(+), 272 deletions(-)

diff --git a/doc/appdocsxml.dtd b/doc/appdocsxml.dtd
index 426d959466..ad5f16c0b6 100644
--- a/doc/appdocsxml.dtd
+++ b/doc/appdocsxml.dtd
@@ -72,10 +72,10 @@
   <!ELEMENT configFile (configObject|xi:include)+>
   <!ATTLIST configFile name CDATA #REQUIRED>
 
-  <!ELEMENT configObject (synopsis?|description?|syntax?|see-also?|(configOption|xi:include))*>
+  <!ELEMENT configObject (since?|synopsis?|description?|syntax?|see-also?|(configOption|xi:include))*>
   <!ATTLIST configObject name CDATA #REQUIRED>
 
-  <!ELEMENT configOption (synopsis,description?,syntax?,see-also?)*>
+  <!ELEMENT configOption (since?,synopsis,description?,syntax?,see-also?)*>
   <!ATTLIST configOption name CDATA #REQUIRED>
   <!ATTLIST configOption regex (yes|no|true|false) "false">
   <!ATTLIST configOption default CDATA #IMPLIED>
diff --git a/include/asterisk/agi.h b/include/asterisk/agi.h
index 568cd5d116..dfa6dceacd 100644
--- a/include/asterisk/agi.h
+++ b/include/asterisk/agi.h
@@ -60,6 +60,10 @@ typedef struct agi_command {
 	struct ast_module *mod;
 	/*! Linked list pointer */
 	AST_LIST_ENTRY(agi_command) list;
+	/*! Since content */
+	const char * const since;
+	/*! Syntax arguments content */
+	const char * const arguments;
 } agi_command;
 
 /*!
diff --git a/include/asterisk/manager.h b/include/asterisk/manager.h
index 923f1738cd..05f3462c86 100644
--- a/include/asterisk/manager.h
+++ b/include/asterisk/manager.h
@@ -181,6 +181,7 @@ struct manager_action {
 	 * function and unregistering the AMI action object.
 	 */
 	unsigned int registered:1;
+	AST_STRING_FIELD_EXTENDED(since);	/*!< Documentation "since" element */
 };
 
 /*! \brief External routines may register/unregister manager callbacks this way
diff --git a/include/asterisk/pbx.h b/include/asterisk/pbx.h
index ec752a96db..f66b54c1bc 100644
--- a/include/asterisk/pbx.h
+++ b/include/asterisk/pbx.h
@@ -150,6 +150,7 @@ struct ast_custom_function {
 					 * \since 12 */
 
 	AST_RWLIST_ENTRY(ast_custom_function) acflist;
+	AST_STRING_FIELD_EXTENDED(since); /*!< Since text for 'show functions' */
 };
 
 /*! \brief All switch functions have the same interface, so define a type for them */
diff --git a/include/asterisk/xmldoc.h b/include/asterisk/xmldoc.h
index b14288f852..5f9164fd2c 100644
--- a/include/asterisk/xmldoc.h
+++ b/include/asterisk/xmldoc.h
@@ -78,6 +78,8 @@ struct ast_xml_doc_item {
 	struct ast_xml_node *node;
 	/*! The next XML documentation item that matches the same name/item type */
 	AST_LIST_ENTRY(ast_xml_doc_item) next;
+	/*! Since tagged information, if it exists */
+	struct ast_str *since;
 };
 
 /*! \brief Execute an XPath query on the loaded XML documentation
@@ -110,6 +112,16 @@ char *ast_xmldoc_build_syntax(const char *type, const char *name, const char *mo
  */
 char *ast_xmldoc_build_seealso(const char *type, const char *name, const char *module);
 
+/*!
+ *  \brief Parse the <since> node content.
+ *  \param type 'application', 'function' or 'agi'.
+ *  \param name Application or functions name.
+ *  \param module The module the item is in (optional, can be NULL)
+ *  \retval NULL on error.
+ *  \retval Content of the since node.
+ */
+char *ast_xmldoc_build_since(const char *type, const char *name, const char *module);
+
 /*!
  *  \brief Generate the [arguments] tag based on type of node ('application',
  *         'function' or 'agi') and name.
diff --git a/main/config_options.c b/main/config_options.c
index 9769fd3ae1..ae3fae549f 100644
--- a/main/config_options.c
+++ b/main/config_options.c
@@ -1244,10 +1244,14 @@ static void cli_show_module_types(struct ast_cli_args *a)
 	}
 
 	if (ast_str_strlen(item->synopsis)) {
-		ast_cli(a->fd, "%s\n\n", ast_xmldoc_printable(ast_str_buffer(item->synopsis), 1));
+		char *value = ast_xmldoc_printable(ast_str_buffer(item->synopsis), 1);
+		ast_cli(a->fd, "%s\n\n", value);
+		ast_free(value);
 	}
 	if (ast_str_strlen(item->description)) {
-		ast_cli(a->fd, "%s\n\n", ast_xmldoc_printable(ast_str_buffer(item->description), 1));
+		char *value = ast_xmldoc_printable(ast_str_buffer(item->description), 1);
+		ast_cli(a->fd, "%s\n\n",value);
+		ast_free(value);
 	}
 
 	tmp = item;
@@ -1267,8 +1271,8 @@ static void cli_show_module_type(struct ast_cli_args *a)
 {
 	RAII_VAR(struct ast_xml_doc_item *, item, NULL, ao2_cleanup);
 	struct ast_xml_doc_item *tmp;
-	char option_type[64];
 	int match = 0;
+	char *synopsis, *since, *description, *syntax, *seealso;
 
 	ast_assert(a->argc == 5);
 
@@ -1281,19 +1285,48 @@ static void cli_show_module_type(struct ast_cli_args *a)
 	while ((tmp = AST_LIST_NEXT(tmp, next))) {
 		if (!strcasecmp(tmp->type, "configObject") && !strcasecmp(tmp->name, a->argv[4])) {
 			match = 1;
-			term_color(option_type, tmp->name, COLOR_MAGENTA, COLOR_BLACK, sizeof(option_type));
-			ast_cli(a->fd, "%s", option_type);
-			if (ast_str_strlen(tmp->syntax)) {
-				ast_cli(a->fd, ": [%s]\n\n", ast_xmldoc_printable(ast_str_buffer(tmp->syntax), 1));
-			} else {
-				ast_cli(a->fd, "\n\n");
-			}
-			if (ast_str_strlen(tmp->synopsis)) {
-				ast_cli(a->fd, "%s\n\n", ast_xmldoc_printable(ast_str_buffer(tmp->synopsis), 1));
-			}
-			if (ast_str_strlen(tmp->description)) {
-				ast_cli(a->fd, "%s\n\n", ast_xmldoc_printable(ast_str_buffer(tmp->description), 1));
+
+			synopsis = ast_xmldoc_printable(AS_OR(tmp->synopsis, "Not available"), 1);
+			since = ast_xmldoc_printable(AS_OR(tmp->since, "Not available"), 1);
+			description = ast_xmldoc_printable(AS_OR(tmp->description, "Not available"), 1);
+			syntax = ast_xmldoc_printable(AS_OR(tmp->syntax, "Not available"), 1);
+			seealso = ast_xmldoc_printable(AS_OR(tmp->seealso, "Not available"), 1);
+
+			if (!synopsis || !since || !description || !syntax || !seealso ) {
+				ast_free(synopsis);
+				ast_free(since);
+				ast_free(description);
+				ast_free(syntax);
+				ast_free(seealso);
+				ast_cli(a->fd, "Error: Memory allocation failed\n");
+				break;
 			}
+
+			ast_cli(a->fd, "\n"
+				"%s  -= Info about Config Object '%s:%s' =- %s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s [%s]\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n",
+				ast_term_color(COLOR_MAGENTA, 0), a->argv[3], tmp->name, ast_term_reset(),
+				COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+				COLORIZE(COLOR_MAGENTA, 0, "[Since]"), since,
+				COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+				COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"), tmp->name, syntax,
+				COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso
+				);
+			ast_free(synopsis);
+			ast_free(since);
+			ast_free(description);
+			ast_free(syntax);
+			ast_free(seealso);
+
 		}
 	}
 
@@ -1304,6 +1337,8 @@ static void cli_show_module_type(struct ast_cli_args *a)
 
 	/* Now iterate over the options for the type */
 	tmp = item;
+	ast_cli(a->fd, COLORIZE_FMT "\n", COLORIZE(COLOR_MAGENTA, 0, "[Config Options]"));
+
 	while ((tmp = AST_LIST_NEXT(tmp, next))) {
 		if (!strcasecmp(tmp->type, "configOption") && !strcasecmp(tmp->ref, a->argv[4])) {
 			ast_cli(a->fd, "%-25s -- %-120.120s\n", tmp->name,
@@ -1319,8 +1354,8 @@ static void cli_show_module_options(struct ast_cli_args *a)
 {
 	RAII_VAR(struct ast_xml_doc_item *, item, NULL, ao2_cleanup);
 	struct ast_xml_doc_item *tmp;
-	char option_name[64];
 	int match = 0;
+	char *synopsis, *since, *description, *syntax, *seealso;
 
 	ast_assert(a->argc == 6);
 
@@ -1334,20 +1369,47 @@ static void cli_show_module_options(struct ast_cli_args *a)
 			if (match) {
 				ast_cli(a->fd, "\n");
 			}
-			term_color(option_name, tmp->ref, COLOR_MAGENTA, COLOR_BLACK, sizeof(option_name));
-			ast_cli(a->fd, "[%s%s]\n", option_name, ast_term_reset());
-			if (ast_str_strlen(tmp->syntax)) {
-				ast_cli(a->fd, "%s\n", ast_xmldoc_printable(ast_str_buffer(tmp->syntax), 1));
-			}
-			ast_cli(a->fd, "%s\n\n", ast_xmldoc_printable(AS_OR(tmp->synopsis, "No information available"), 1));
-			if (ast_str_strlen(tmp->description)) {
-				ast_cli(a->fd, "%s\n\n", ast_xmldoc_printable(ast_str_buffer(tmp->description), 1));
+
+			synopsis = ast_xmldoc_printable(AS_OR(tmp->synopsis, "Not available"), 1);
+			since = ast_xmldoc_printable(AS_OR(tmp->since, "Not available"), 1);
+			description = ast_xmldoc_printable(AS_OR(tmp->description, "Not available"), 1);
+			syntax = ast_xmldoc_printable(AS_OR(tmp->syntax, "Not available"), 1);
+			seealso = ast_xmldoc_printable(AS_OR(tmp->seealso, "Not available"), 1);
+
+			if (!synopsis || !since || !description || !syntax || !seealso ) {
+				ast_free(synopsis);
+				ast_free(since);
+				ast_free(description);
+				ast_free(syntax);
+				ast_free(seealso);
+				ast_cli(a->fd, "Error: Memory allocation failed\n");
+				break;
 			}
 
-			if (ast_str_strlen(tmp->seealso)) {
-				ast_cli(a->fd, "See Also:\n");
-				ast_cli(a->fd, "%s\n\n", ast_xmldoc_printable(ast_str_buffer(tmp->seealso), 1));
-			}
+			ast_cli(a->fd, "\n"
+				"%s  -= Info about Config Option '%s:%s:%s' =- %s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n",
+				ast_term_color(COLOR_MAGENTA, 0), a->argv[3], a->argv[4], tmp->name, ast_term_reset(),
+				COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+				COLORIZE(COLOR_MAGENTA, 0, "[Since]"), since,
+				COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+				COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"), syntax,
+				COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso
+				);
+			ast_free(synopsis);
+			ast_free(since);
+			ast_free(description);
+			ast_free(syntax);
+			ast_free(seealso);
 
 			match = 1;
 		}
diff --git a/main/manager.c b/main/manager.c
index 2a543151b2..7fe245335f 100644
--- a/main/manager.c
+++ b/main/manager.c
@@ -1084,10 +1084,6 @@ static char *handle_showmancmd(struct ast_cli_entry *e, int cmd, struct ast_cli_
 	int num;
 	int l;
 	const char *auth_str;
-#ifdef AST_XML_DOCS
-	char syntax_title[64], description_title[64], synopsis_title[64], seealso_title[64];
-	char arguments_title[64], privilege_title[64], final_response_title[64], list_responses_title[64];
-#endif
 
 	switch (cmd) {
 	case CLI_INIT:
@@ -1115,18 +1111,6 @@ static char *handle_showmancmd(struct ast_cli_entry *e, int cmd, struct ast_cli_
 
 	authority = ast_str_alloca(MAX_AUTH_PERM_STRING);
 
-#ifdef AST_XML_DOCS
-	/* setup the titles */
-	term_color(synopsis_title, "[Synopsis]\n", COLOR_MAGENTA, 0, 40);
-	term_color(description_title, "[Description]\n", COLOR_MAGENTA, 0, 40);
-	term_color(syntax_title, "[Syntax]\n", COLOR_MAGENTA, 0, 40);
-	term_color(seealso_title, "[See Also]\n", COLOR_MAGENTA, 0, 40);
-	term_color(arguments_title, "[Arguments]\n", COLOR_MAGENTA, 0, 40);
-	term_color(privilege_title, "[Privilege]\n", COLOR_MAGENTA, 0, 40);
-	term_color(final_response_title, "[Final Response]\n", COLOR_MAGENTA, 0, 40);
-	term_color(list_responses_title, "[List Responses]\n", COLOR_MAGENTA, 0, 40);
-#endif
-
 	AST_RWLIST_RDLOCK(&actions);
 	AST_RWLIST_TRAVERSE(&actions, cur, list) {
 		for (num = 3; num < a->argc; num++) {
@@ -1135,22 +1119,24 @@ static char *handle_showmancmd(struct ast_cli_entry *e, int cmd, struct ast_cli_
 
 #ifdef AST_XML_DOCS
 				if (cur->docsrc == AST_XML_DOC) {
-					char *syntax = ast_xmldoc_printable(S_OR(cur->syntax, "Not available"), 1);
 					char *synopsis = ast_xmldoc_printable(S_OR(cur->synopsis, "Not available"), 1);
+					char *since = ast_xmldoc_printable(S_OR(cur->since, "Not available"), 1);
 					char *description = ast_xmldoc_printable(S_OR(cur->description, "Not available"), 1);
+					char *syntax = ast_xmldoc_printable(S_OR(cur->syntax, "Not available"), 1);
 					char *arguments = ast_xmldoc_printable(S_OR(cur->arguments, "Not available"), 1);
-					char *seealso = ast_xmldoc_printable(S_OR(cur->seealso, "Not available"), 1);
 					char *privilege = ast_xmldoc_printable(S_OR(auth_str, "Not available"), 1);
+					char *seealso = ast_xmldoc_printable(S_OR(cur->seealso, "Not available"), 1);
 					char *responses = ast_xmldoc_printable("None", 1);
 
-					if (!syntax || !synopsis || !description || !arguments
-							|| !seealso || !privilege || !responses) {
-						ast_free(syntax);
+					if (!synopsis || !since || !description || !syntax || !arguments
+							|| !privilege || !seealso || !responses) {
 						ast_free(synopsis);
+						ast_free(since);
 						ast_free(description);
+						ast_free(syntax);
 						ast_free(arguments);
-						ast_free(seealso);
 						ast_free(privilege);
+						ast_free(seealso);
 						ast_free(responses);
 						ast_cli(a->fd, "Allocation failure.\n");
 						AST_RWLIST_UNLOCK(&actions);
@@ -1158,14 +1144,33 @@ static char *handle_showmancmd(struct ast_cli_entry *e, int cmd, struct ast_cli_
 						return CLI_FAILURE;
 					}
 
-					ast_cli(a->fd, "%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n%s",
-						syntax_title, syntax,
-						synopsis_title, synopsis,
-						description_title, description,
-						arguments_title, arguments,
-						seealso_title, seealso,
-						privilege_title, privilege,
-						list_responses_title);
+					ast_cli(a->fd, "\n"
+						"%s  -= Info about Manager Command '%s' =- %s\n\n"
+						COLORIZE_FMT "\n"
+						"%s\n\n"
+						COLORIZE_FMT "\n"
+						"%s\n\n"
+						COLORIZE_FMT "\n"
+						"%s\n\n"
+						COLORIZE_FMT "\n"
+						"%s\n\n"
+						COLORIZE_FMT "\n"
+						"%s\n\n"
+						COLORIZE_FMT "\n"
+						"%s\n\n"
+						COLORIZE_FMT "\n"
+						"%s\n\n"
+						COLORIZE_FMT "\n",
+						ast_term_color(COLOR_MAGENTA, 0), cur->action, ast_term_reset(),
+						COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+						COLORIZE(COLOR_MAGENTA, 0, "[Since]"), since,
+						COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+						COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"), syntax,
+						COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
+						COLORIZE(COLOR_MAGENTA, 0, "[Privilege]"), privilege,
+						COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso,
+						COLORIZE(COLOR_MAGENTA, 0, "[List Responses]")
+						);
 
 					if (!cur->list_responses) {
 						ast_cli(a->fd, "%s\n\n", responses);
@@ -1176,22 +1181,33 @@ static char *handle_showmancmd(struct ast_cli_entry *e, int cmd, struct ast_cli_
 							print_event_instance(a, temp);
 						}
 					}
+					ast_cli(a->fd,
+						COLORIZE_FMT "\n",
+						COLORIZE(COLOR_MAGENTA, 0, "[End List Responses]")
+						);
 
-					ast_cli(a->fd, "%s", final_response_title);
-
+					ast_cli(a->fd, "\n"
+						COLORIZE_FMT "\n",
+						COLORIZE(COLOR_MAGENTA, 0, "[Final Response]")
+						);
 					if (!cur->final_response) {
 						ast_cli(a->fd, "%s\n\n", responses);
 					} else {
 						ast_cli(a->fd, "Event: %s\n", cur->final_response->name);
 						print_event_instance(a, cur->final_response);
 					}
+					ast_cli(a->fd,
+						COLORIZE_FMT "\n",
+						COLORIZE(COLOR_MAGENTA, 0, "[End Final Response]")
+						);
 
-					ast_free(syntax);
 					ast_free(synopsis);
+					ast_free(since);
 					ast_free(description);
+					ast_free(syntax);
 					ast_free(arguments);
-					ast_free(seealso);
 					ast_free(privilege);
+					ast_free(seealso);
 					ast_free(responses);
 				} else
 #endif
@@ -7754,6 +7770,11 @@ int ast_manager_register2(const char *action, int auth, int (*func)(struct manse
 		return -1;
 	}
 
+	if (ast_string_field_init_extended(cur, since)) {
+		ao2_t_ref(cur, -1, "action object creation failed");
+		return -1;
+	}
+
 	cur->action = action;
 	cur->authority = auth;
 	cur->func = func;
@@ -7762,6 +7783,10 @@ int ast_manager_register2(const char *action, int auth, int (*func)(struct manse
 	if (ast_strlen_zero(synopsis) && ast_strlen_zero(description)) {
 		char *tmpxml;
 
+		tmpxml = ast_xmldoc_build_since("manager", action, NULL);
+		ast_string_field_set(cur, since, tmpxml);
+		ast_free(tmpxml);
+
 		tmpxml = ast_xmldoc_build_synopsis("manager", action, NULL);
 		ast_string_field_set(cur, synopsis, tmpxml);
 		ast_free(tmpxml);
@@ -9174,39 +9199,50 @@ static char *handle_manager_show_events(struct ast_cli_entry *e, int cmd, struct
 
 static void print_event_instance(struct ast_cli_args *a, struct ast_xml_doc_item *instance)
 {
-	char syntax_title[64], description_title[64], synopsis_title[64], seealso_title[64], arguments_title[64];
+	char *since, *syntax, *description, *synopsis, *seealso, *arguments;
 
-	term_color(synopsis_title, "[Synopsis]\n", COLOR_MAGENTA, 0, 40);
-	term_color(description_title, "[Description]\n", COLOR_MAGENTA, 0, 40);
-	term_color(syntax_title, "[Syntax]\n", COLOR_MAGENTA, 0, 40);
-	term_color(seealso_title, "[See Also]\n", COLOR_MAGENTA, 0, 40);
-	term_color(arguments_title, "[Arguments]\n", COLOR_MAGENTA, 0, 40);
+	synopsis = ast_xmldoc_printable(AS_OR(instance->synopsis, "Not available"), 1);
+	since = ast_xmldoc_printable(AS_OR(instance->since, "Not available"), 1);
+	description = ast_xmldoc_printable(AS_OR(instance->description, "Not available"), 1);
+	syntax = ast_xmldoc_printable(AS_OR(instance->syntax, "Not available"), 1);
+	arguments = ast_xmldoc_printable(AS_OR(instance->arguments, "Not available"), 1);
+	seealso = ast_xmldoc_printable(AS_OR(instance->seealso, "Not available"), 1);
 
-	if (!ast_strlen_zero(ast_str_buffer(instance->synopsis))) {
-		char *synopsis = ast_xmldoc_printable(ast_str_buffer(instance->synopsis), 1);
-		ast_cli(a->fd, "%s%s\n\n", synopsis_title, synopsis);
-		ast_free(synopsis);
-	}
-	if (!ast_strlen_zero(ast_str_buffer(instance->syntax))) {
-		char *syntax = ast_xmldoc_printable(ast_str_buffer(instance->syntax), 1);
-		ast_cli(a->fd, "%s%s\n\n", syntax_title, syntax);
-		ast_free(syntax);
-	}
-	if (!ast_strlen_zero(ast_str_buffer(instance->description))) {
-		char *description = ast_xmldoc_printable(ast_str_buffer(instance->description), 1);
-		ast_cli(a->fd, "%s%s\n\n", description_title, description);
-		ast_free(description);
-	}
-	if (!ast_strlen_zero(ast_str_buffer(instance->arguments))) {
-		char *arguments = ast_xmldoc_printable(ast_str_buffer(instance->arguments), 1);
-		ast_cli(a->fd, "%s%s\n\n", arguments_title, arguments);
-		ast_free(arguments);
-	}
-	if (!ast_strlen_zero(ast_str_buffer(instance->seealso))) {
-		char *seealso = ast_xmldoc_printable(ast_str_buffer(instance->seealso), 1);
-		ast_cli(a->fd, "%s%s\n\n", seealso_title, seealso);
-		ast_free(seealso);
+	if (!synopsis || !since || !description || !syntax || !arguments || !seealso) {
+		ast_cli(a->fd, "Error: Memory allocation failed\n");
+		goto free_docs;
 	}
+
+	ast_cli(a->fd, "\n"
+		"%s  -= Info about Manager Event '%s' =- %s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n",
+		ast_term_color(COLOR_MAGENTA, 0), instance->name, ast_term_reset(),
+		COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+		COLORIZE(COLOR_MAGENTA, 0, "[Since]"), since,
+		COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+		COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"), syntax,
+		COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
+		COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso
+		);
+
+free_docs:
+	ast_free(synopsis);
+	ast_free(since);
+	ast_free(description);
+	ast_free(syntax);
+	ast_free(arguments);
+	ast_free(seealso);
 }
 
 static char *handle_manager_show_event(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
diff --git a/main/pbx_app.c b/main/pbx_app.c
index ecbca1d85f..9b2068d29f 100644
--- a/main/pbx_app.c
+++ b/main/pbx_app.c
@@ -46,6 +46,7 @@ struct ast_app {
 	int (*execute)(struct ast_channel *chan, const char *data);
 	AST_DECLARE_STRING_FIELDS(
 		AST_STRING_FIELD(synopsis);     /*!< Synopsis text for 'show applications' */
+		AST_STRING_FIELD(since);        /*!< Since text for 'show applications' */
 		AST_STRING_FIELD(description);  /*!< Description (help text) for 'show application &lt;name&gt;' */
 		AST_STRING_FIELD(syntax);       /*!< Syntax text for 'core show applications' */
 		AST_STRING_FIELD(arguments);    /*!< Arguments description */
@@ -142,6 +143,11 @@ int ast_register_application2(const char *app, int (*execute)(struct ast_channel
 		ast_string_field_set(tmp, synopsis, tmpxml);
 		ast_free(tmpxml);
 
+		/* load since */
+		tmpxml = ast_xmldoc_build_since("application", app, ast_module_name(tmp->module));
+		ast_string_field_set(tmp, since, tmpxml);
+		ast_free(tmpxml);
+
 		/* load description */
 		tmpxml = ast_xmldoc_build_description("application", app, ast_module_name(tmp->module));
 		ast_string_field_set(tmp, description, tmpxml);
@@ -191,67 +197,61 @@ int ast_register_application2(const char *app, int (*execute)(struct ast_channel
 
 static void print_app_docs(struct ast_app *aa, int fd)
 {
+	char *synopsis = NULL, *since = NULL, *description = NULL, *syntax = NULL, *arguments = NULL, *seealso = NULL;
+
 #ifdef AST_XML_DOCS
-	char *synopsis = NULL, *description = NULL, *arguments = NULL, *seealso = NULL;
 	if (aa->docsrc == AST_XML_DOC) {
 		synopsis = ast_xmldoc_printable(S_OR(aa->synopsis, "Not available"), 1);
+		since = ast_xmldoc_printable(S_OR(aa->since, "Not available"), 1);
 		description = ast_xmldoc_printable(S_OR(aa->description, "Not available"), 1);
+		syntax = ast_xmldoc_printable(S_OR(aa->syntax, "Not available"), 1);
 		arguments = ast_xmldoc_printable(S_OR(aa->arguments, "Not available"), 1);
 		seealso = ast_xmldoc_printable(S_OR(aa->seealso, "Not available"), 1);
-		if (!synopsis || !description || !arguments || !seealso) {
-			goto free_docs;
-		}
-		ast_cli(fd, "\n"
-			"%s  -= Info about application '%s' =- %s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s%s%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n\n"
-			COLORIZE_FMT "\n"
-			"%s\n",
-			ast_term_color(COLOR_MAGENTA, 0), aa->name, ast_term_reset(),
-			COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
-			COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
-			COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"),
-				ast_term_color(COLOR_CYAN, 0), S_OR(aa->syntax, "Not available"), ast_term_reset(),
-			COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
-			COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso);
-free_docs:
-		ast_free(synopsis);
-		ast_free(description);
-		ast_free(arguments);
-		ast_free(seealso);
 	} else
 #endif
 	{
-		ast_cli(fd, "\n"
-			"%s  -= Info about application '%s' =- %s\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n\n"
-			COLORIZE_FMT "\n"
-			COLORIZE_FMT "\n",
-			ast_term_color(COLOR_MAGENTA, 0), aa->name, ast_term_reset(),
-			COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->synopsis, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[Description]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->description, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->syntax, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->arguments, "Not available")),
-			COLORIZE(COLOR_MAGENTA, 0, "[See Also]"),
-			COLORIZE(COLOR_CYAN, 0, S_OR(aa->seealso, "Not available")));
+		synopsis = ast_strdup(S_OR(aa->synopsis, "Not Available"));
+		since = ast_strdup(S_OR(aa->since, "Not Available"));
+		description = ast_strdup(S_OR(aa->description, "Not Available"));
+		syntax = ast_strdup(S_OR(aa->syntax, "Not Available"));
+		arguments = ast_strdup(S_OR(aa->arguments, "Not Available"));
+		seealso = ast_strdup(S_OR(aa->seealso, "Not Available"));
 	}
+		/* check allocated memory. */
+	if (!synopsis || !since || !description || !syntax || !arguments || !seealso) {
+		goto free_docs;
+	}
+
+	ast_cli(fd, "\n"
+		"%s  -= Info about Application '%s' =- %s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n",
+		ast_term_color(COLOR_MAGENTA, 0), aa->name, ast_term_reset(),
+		COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+		COLORIZE(COLOR_MAGENTA, 0, "[Since]"), since,
+		COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+		COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"), syntax,
+		COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
+		COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso
+		);
+
+free_docs:
+	ast_free(synopsis);
+	ast_free(since);
+	ast_free(description);
+	ast_free(syntax);
+	ast_free(arguments);
+	ast_free(seealso);
 }
 
 /*!
diff --git a/main/pbx_functions.c b/main/pbx_functions.c
index 1402696b6b..a244ddcc08 100644
--- a/main/pbx_functions.c
+++ b/main/pbx_functions.c
@@ -144,10 +144,8 @@ static char *handle_show_function(struct ast_cli_entry *e, int cmd, struct ast_c
 {
 	struct ast_custom_function *acf;
 	/* Maximum number of characters added by terminal coloring is 22 */
-	char infotitle[64 + AST_MAX_APP + 22], syntitle[40], desctitle[40], argtitle[40], seealsotitle[40];
-	char info[64 + AST_MAX_APP], *synopsis = NULL, *description = NULL, *seealso = NULL;
-	char stxtitle[40], *syntax = NULL, *arguments = NULL;
-	int syntax_size, description_size, synopsis_size, arguments_size, seealso_size;
+	char *synopsis = NULL, *since = NULL, *description = NULL, *syntax = NULL, *arguments = NULL, *seealso = NULL;
+	char *rtn = CLI_SUCCESS;
 
 	switch (cmd) {
 	case CLI_INIT:
@@ -170,71 +168,62 @@ static char *handle_show_function(struct ast_cli_entry *e, int cmd, struct ast_c
 		return CLI_FAILURE;
 	}
 
-	syntax_size = strlen(S_OR(acf->syntax, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
-	syntax = ast_malloc(syntax_size);
-	if (!syntax) {
-		ast_cli(a->fd, "Memory allocation failure!\n");
-
-		return CLI_FAILURE;
-	}
-
-	snprintf(info, sizeof(info), "\n  -= Info about function '%s' =- \n\n", acf->name);
-	term_color(infotitle, info, COLOR_MAGENTA, 0, sizeof(infotitle));
-	term_color(syntitle, "[Synopsis]\n", COLOR_MAGENTA, 0, 40);
-	term_color(desctitle, "[Description]\n", COLOR_MAGENTA, 0, 40);
-	term_color(stxtitle, "[Syntax]\n", COLOR_MAGENTA, 0, 40);
-	term_color(argtitle, "[Arguments]\n", COLOR_MAGENTA, 0, 40);
-	term_color(seealsotitle, "[See Also]\n", COLOR_MAGENTA, 0, 40);
-	term_color(syntax, S_OR(acf->syntax, "Not available"), COLOR_CYAN, 0, syntax_size);
 #ifdef AST_XML_DOCS
 	if (acf->docsrc == AST_XML_DOC) {
-		arguments = ast_xmldoc_printable(S_OR(acf->arguments, "Not available"), 1);
 		synopsis = ast_xmldoc_printable(S_OR(acf->synopsis, "Not available"), 1);
+		since = ast_xmldoc_printable(S_OR(acf->since, "Not available"), 1);
 		description = ast_xmldoc_printable(S_OR(acf->desc, "Not available"), 1);
+		syntax = ast_xmldoc_printable(S_OR(acf->syntax, "Not available"), 1);
+		arguments = ast_xmldoc_printable(S_OR(acf->arguments, "Not available"), 1);
 		seealso = ast_xmldoc_printable(S_OR(acf->seealso, "Not available"), 1);
 	} else
 #endif
 	{
-		synopsis_size = strlen(S_OR(acf->synopsis, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
-		synopsis = ast_malloc(synopsis_size);
-
-		description_size = strlen(S_OR(acf->desc, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
-		description = ast_malloc(description_size);
-
-		arguments_size = strlen(S_OR(acf->arguments, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
-		arguments = ast_malloc(arguments_size);
-
-		seealso_size = strlen(S_OR(acf->seealso, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
-		seealso = ast_malloc(seealso_size);
-
+		synopsis = ast_strdup(S_OR(acf->synopsis, "Not Available"));
+		since = ast_strdup(S_OR(acf->since, "Not Available"));
+		description = ast_strdup(S_OR(acf->desc, "Not Available"));
+		syntax = ast_strdup(S_OR(acf->syntax, "Not Available"));
+		arguments = ast_strdup(S_OR(acf->arguments, "Not Available"));
+		seealso = ast_strdup(S_OR(acf->seealso, "Not Available"));
+	}
 		/* check allocated memory. */
-		if (!synopsis || !description || !arguments || !seealso) {
-			ast_free(synopsis);
-			ast_free(description);
-			ast_free(arguments);
-			ast_free(seealso);
-			ast_free(syntax);
-
-			return CLI_FAILURE;
-		}
-
-		term_color(arguments, S_OR(acf->arguments, "Not available"), COLOR_CYAN, 0, arguments_size);
-		term_color(synopsis, S_OR(acf->synopsis, "Not available"), COLOR_CYAN, 0, synopsis_size);
-		term_color(description, S_OR(acf->desc, "Not available"), COLOR_CYAN, 0, description_size);
-		term_color(seealso, S_OR(acf->seealso, "Not available"), COLOR_CYAN, 0, seealso_size);
+	if (!synopsis || !since || !description || !syntax || !arguments || !seealso) {
+		rtn = CLI_FAILURE;
+		goto free_docs;
 	}
 
-	ast_cli(a->fd, "%s%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n",
-			infotitle, syntitle, synopsis, desctitle, description,
-			stxtitle, syntax, argtitle, arguments, seealsotitle, seealso);
+	ast_cli(a->fd, "\n"
+		"%s  -= Info about Function '%s' =- %s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n"
+		COLORIZE_FMT "\n"
+		"%s\n\n",
+		ast_term_color(COLOR_MAGENTA, 0), acf->name, ast_term_reset(),
+		COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+		COLORIZE(COLOR_MAGENTA, 0, "[Since]"), since,
+		COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+		COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"), syntax,
+		COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
+		COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso
+		);
 
-	ast_free(arguments);
+free_docs:
 	ast_free(synopsis);
+	ast_free(since);
 	ast_free(description);
-	ast_free(seealso);
 	ast_free(syntax);
+	ast_free(arguments);
+	ast_free(seealso);
 
-	return CLI_SUCCESS;
+	return rtn;
 }
 
 static struct ast_custom_function *ast_custom_function_find_nolock(const char *name)
@@ -339,11 +328,21 @@ static int acf_retrieve_docs(struct ast_custom_function *acf)
 		return -1;
 	}
 
+	if (ast_string_field_init_extended(acf, since)) {
+		ast_string_field_free_memory(acf);
+		return -1;
+	}
+
 	/* load synopsis */
 	tmpxml = ast_xmldoc_build_synopsis("function", acf->name, ast_module_name(acf->mod));
 	ast_string_field_set(acf, synopsis, tmpxml);
 	ast_free(tmpxml);
 
+	/* load since */
+	tmpxml = ast_xmldoc_build_since("function", acf->name, ast_module_name(acf->mod));
+	ast_string_field_set(acf, since, tmpxml);
+	ast_free(tmpxml);
+
 	/* load description */
 	tmpxml = ast_xmldoc_build_description("function", acf->name, ast_module_name(acf->mod));
 	ast_string_field_set(acf, desc, tmpxml);
diff --git a/main/xmldoc.c b/main/xmldoc.c
index 2b75523402..a960addb36 100644
--- a/main/xmldoc.c
+++ b/main/xmldoc.c
@@ -1722,6 +1722,91 @@ char *ast_xmldoc_build_seealso(const char *type, const char *name, const char *m
 	return output;
 }
 
+/*!
+ * \internal
+ * \brief Build since information for an item
+ *
+ * \param node	The since node to parse
+ *
+ * \note This method exists for when you already have the node.  This
+ * prevents having to lock the documentation tree twice
+ *
+ * \retval A malloc'd character pointer to the since information of the item
+ * \retval NULL on failure
+ *
+ * \since 22
+ */
+static char *_ast_xmldoc_build_since(struct ast_xml_node *node)
+{
+	char *output;
+	struct ast_str *outputstr;
+	const char *content;
+	int first = 1;
+
+	/* Find the <since> node. */
+	for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
+		if (!strcasecmp(ast_xml_node_get_name(node), "since")) {
+			break;
+		}
+	}
+
+	if (!node || !ast_xml_node_get_children(node)) {
+		/* we couldnt find a <since> node. */
+		return NULL;
+	}
+
+	/* prepare the output string. */
+	outputstr = ast_str_create(128);
+	if (!outputstr) {
+		return NULL;
+	}
+
+	/* get into the <since> node. */
+	for (node = ast_xml_node_get_children(node); node; node = ast_xml_node_get_next(node)) {
+		if (strcasecmp(ast_xml_node_get_name(node), "version")) {
+			continue;
+		}
+
+		content = ast_xml_get_text(node);
+		if (!content) {
+			continue;
+		}
+
+		ast_str_append(&outputstr, 0, "%s%s", (first ? "" : ", "), content);
+
+		first = 0;
+		ast_xml_free_text(content);
+	}
+
+	output = ast_strdup(ast_str_buffer(outputstr));
+	ast_free(outputstr);
+
+	return output;
+}
+
+char *ast_xmldoc_build_since(const char *type, const char *name, const char *module)
+{
+	char *output;
+	struct ast_xml_node *node;
+
+	if (ast_strlen_zero(type) || ast_strlen_zero(name)) {
+		return NULL;
+	}
+
+	/* get the application/function root node. */
+	AST_RWLIST_RDLOCK(&xmldoc_tree);
+	node = xmldoc_get_node(type, name, module, documentation_language);
+	if (!node || !ast_xml_node_get_children(node)) {
+		AST_RWLIST_UNLOCK(&xmldoc_tree);
+		return NULL;
+	}
+
+	output = _ast_xmldoc_build_since(node);
+	AST_RWLIST_UNLOCK(&xmldoc_tree);
+
+	return output;
+}
+
 /*!
  * \internal
  * \brief Parse a \<enum\> node.
@@ -2286,11 +2371,12 @@ static void ast_xml_doc_item_destructor(void *obj)
 		return;
 	}
 
-	ast_free(doc->syntax);
-	ast_free(doc->seealso);
-	ast_free(doc->arguments);
 	ast_free(doc->synopsis);
+	ast_free(doc->since);
 	ast_free(doc->description);
+	ast_free(doc->syntax);
+	ast_free(doc->arguments);
+	ast_free(doc->seealso);
 	ast_string_field_free_memory(doc);
 
 	if (AST_LIST_NEXT(doc, next)) {
@@ -2318,11 +2404,13 @@ static struct ast_xml_doc_item *ast_xml_doc_item_alloc(const char *name, const c
 		return NULL;
 	}
 
-	if (   !(item->syntax = ast_str_create(128))
-		|| !(item->seealso = ast_str_create(128))
+	if (   !(item->synopsis = ast_str_create(128))
+		|| !(item->since = ast_str_create(128))
+		|| !(item->description = ast_str_create(128))
+		|| !(item->syntax = ast_str_create(128))
 		|| !(item->arguments = ast_str_create(128))
-		|| !(item->synopsis = ast_str_create(128))
-		|| !(item->description = ast_str_create(128))) {
+		|| !(item->seealso = ast_str_create(128))
+		) {
 		ast_log(AST_LOG_ERROR, "Failed to allocate strings for ast_xml_doc_item instance\n");
 		goto ast_xml_doc_item_failure;
 	}
@@ -2381,44 +2469,50 @@ static int ast_xml_doc_item_cmp(void *obj, void *arg, int flags)
 static struct ast_xml_doc_item *xmldoc_build_documentation_item(struct ast_xml_node *node, const char *name, const char *type)
 {
 	struct ast_xml_doc_item *item;
-	char *syntax;
-	char *seealso;
-	char *arguments;
 	char *synopsis;
+	char *since;
 	char *description;
+	char *syntax;
+	char *arguments;
+	char *seealso;
 
 	if (!(item = ast_xml_doc_item_alloc(name, type))) {
 		return NULL;
 	}
 	item->node = node;
 
-	syntax = _ast_xmldoc_build_syntax(node, type, name);
-	seealso = _ast_xmldoc_build_seealso(node);
-	arguments = _ast_xmldoc_build_arguments(node);
 	synopsis = _ast_xmldoc_build_synopsis(node);
+	since = _ast_xmldoc_build_since(node);
 	description = _ast_xmldoc_build_description(node);
+	syntax = _ast_xmldoc_build_syntax(node, type, name);
+	arguments = _ast_xmldoc_build_arguments(node);
+	seealso = _ast_xmldoc_build_seealso(node);
 
-	if (syntax) {
-		ast_str_set(&item->syntax, 0, "%s", syntax);
-	}
-	if (seealso) {
-		ast_str_set(&item->seealso, 0, "%s", seealso);
-	}
-	if (arguments) {
-		ast_str_set(&item->arguments, 0, "%s", arguments);
-	}
 	if (synopsis) {
 		ast_str_set(&item->synopsis, 0, "%s", synopsis);
 	}
+	if (since) {
+		ast_str_set(&item->since, 0, "%s", since);
+	}
 	if (description) {
 		ast_str_set(&item->description, 0, "%s", description);
 	}
+	if (syntax) {
+		ast_str_set(&item->syntax, 0, "%s", syntax);
+	}
+	if (arguments) {
+		ast_str_set(&item->arguments, 0, "%s", arguments);
+	}
+	if (seealso) {
+		ast_str_set(&item->seealso, 0, "%s", seealso);
+	}
 
-	ast_free(syntax);
-	ast_free(seealso);
-	ast_free(arguments);
 	ast_free(synopsis);
+	ast_free(since);
 	ast_free(description);
+	ast_free(syntax);
+	ast_free(arguments);
+	ast_free(seealso);
 
 	return item;
 }
diff --git a/res/res_agi.c b/res/res_agi.c
index b3eb8034d6..f008139611 100644
--- a/res/res_agi.c
+++ b/res/res_agi.c
@@ -3834,8 +3834,10 @@ int AST_OPTIONAL_API_NAME(ast_agi_register)(struct ast_module *mod, agi_command
 		if (ast_strlen_zero(cmd->summary) && ast_strlen_zero(cmd->usage)) {
 #ifdef AST_XML_DOCS
 			*((char **) &cmd->summary) = ast_xmldoc_build_synopsis("agi", fullcmd, NULL);
+			*((char **) &cmd->since) = ast_xmldoc_build_since("agi", fullcmd, NULL);
 			*((char **) &cmd->usage) = ast_xmldoc_build_description("agi", fullcmd, NULL);
 			*((char **) &cmd->syntax) = ast_xmldoc_build_syntax("agi", fullcmd, NULL);
+			*((char **) &cmd->arguments) = ast_xmldoc_build_arguments("agi", fullcmd, NULL);
 			*((char **) &cmd->seealso) = ast_xmldoc_build_seealso("agi", fullcmd, NULL);
 			*((enum ast_doc_src *) &cmd->docsrc) = AST_XML_DOC;
 #endif
@@ -3882,12 +3884,16 @@ int AST_OPTIONAL_API_NAME(ast_agi_unregister)(agi_command *cmd)
 #ifdef AST_XML_DOCS
 			if (e->docsrc == AST_XML_DOC) {
 				ast_free((char *) e->summary);
+				ast_free((char *) e->since);
 				ast_free((char *) e->usage);
 				ast_free((char *) e->syntax);
+				ast_free((char *) e->arguments);
 				ast_free((char *) e->seealso);
 				*((char **) &e->summary) = NULL;
+				*((char **) &e->since) = NULL;
 				*((char **) &e->usage) = NULL;
 				*((char **) &e->syntax) = NULL;
+				*((char **) &e->arguments) = NULL;
 				*((char **) &e->seealso) = NULL;
 			}
 #endif
@@ -4346,72 +4352,66 @@ static char *handle_cli_agi_show(struct ast_cli_entry *e, int cmd, struct ast_cl
 	if (a->argc > e->args - 1) {
 		command = find_command(a->argv + e->args, 1);
 		if (command) {
-			char *synopsis = NULL, *description = NULL, *syntax = NULL, *seealso = NULL;
-			char info[30 + MAX_CMD_LEN];					/* '-= Info about...' */
-			char infotitle[30 + MAX_CMD_LEN + AST_TERM_MAX_ESCAPE_CHARS];	/* '-= Info about...' with colors */
-			char syntitle[11 + AST_TERM_MAX_ESCAPE_CHARS];			/* [Syntax]\n with colors */
-			char desctitle[15 + AST_TERM_MAX_ESCAPE_CHARS];			/* [Description]\n with colors */
-			char deadtitle[13 + AST_TERM_MAX_ESCAPE_CHARS];			/* [Runs Dead]\n with colors */
-			char deadcontent[3 + AST_TERM_MAX_ESCAPE_CHARS];		/* 'Yes' or 'No' with colors */
-			char seealsotitle[12 + AST_TERM_MAX_ESCAPE_CHARS];		/* [See Also]\n with colors */
-			char stxtitle[10 + AST_TERM_MAX_ESCAPE_CHARS];			/* [Syntax]\n with colors */
-			size_t synlen, desclen, seealsolen, stxlen;
-
-			term_color(syntitle, "[Synopsis]\n", COLOR_MAGENTA, 0, sizeof(syntitle));
-			term_color(desctitle, "[Description]\n", COLOR_MAGENTA, 0, sizeof(desctitle));
-			term_color(deadtitle, "[Runs Dead]\n", COLOR_MAGENTA, 0, sizeof(deadtitle));
-			term_color(seealsotitle, "[See Also]\n", COLOR_MAGENTA, 0, sizeof(seealsotitle));
-			term_color(stxtitle, "[Syntax]\n", COLOR_MAGENTA, 0, sizeof(stxtitle));
-			term_color(deadcontent, command->dead ? "Yes" : "No", COLOR_CYAN, 0, sizeof(deadcontent));
+			char *synopsis = NULL, *since = NULL, *description = NULL, *syntax = NULL, *arguments = NULL, *seealso = NULL;
 
 			ast_join(fullcmd, sizeof(fullcmd), a->argv + e->args);
-			snprintf(info, sizeof(info), "\n  -= Info about agi '%s' =- ", fullcmd);
-			term_color(infotitle, info, COLOR_CYAN, 0, sizeof(infotitle));
+
 #ifdef AST_XML_DOCS
 			if (command->docsrc == AST_XML_DOC) {
 				synopsis = ast_xmldoc_printable(S_OR(command->summary, "Not available"), 1);
+				since = ast_xmldoc_printable(S_OR(command->since, "Not available"), 1);
 				description = ast_xmldoc_printable(S_OR(command->usage, "Not available"), 1);
+				syntax = ast_xmldoc_printable(S_OR(command->syntax, "Not available"), 1);
+				arguments = ast_xmldoc_printable(S_OR(command->arguments, "Not available"), 1);
 				seealso = ast_xmldoc_printable(S_OR(command->seealso, "Not available"), 1);
-				if (!seealso || !description || !synopsis) {
-					error = 1;
-					goto return_cleanup;
-				}
 			} else
 #endif
 			{
-				synlen = strlen(S_OR(command->summary, "Not available")) + AST_TERM_MAX_ESCAPE_CHARS;
-				synopsis = ast_malloc(synlen);
-
-				desclen = strlen(S_OR(command->usage, "Not available")) + AST_TERM_MAX_ESCAPE_CHARS;
-				description = ast_malloc(desclen);
-
-				seealsolen = strlen(S_OR(command->seealso, "Not available")) + AST_TERM_MAX_ESCAPE_CHARS;
-				seealso = ast_malloc(seealsolen);
-
-				if (!synopsis || !description || !seealso) {
-					error = 1;
-					goto return_cleanup;
-				}
-				term_color(synopsis, S_OR(command->summary, "Not available"), COLOR_CYAN, 0, synlen);
-				term_color(description, S_OR(command->usage, "Not available"), COLOR_CYAN, 0, desclen);
-				term_color(seealso, S_OR(command->seealso, "Not available"), COLOR_CYAN, 0, seealsolen);
+				synopsis = ast_strdup(S_OR(command->summary, "Not Available"));
+				since = ast_strdup(S_OR(command->since, "Not Available"));
+				description = ast_strdup(S_OR(command->usage, "Not Available"));
+				syntax = ast_strdup(S_OR(command->syntax, "Not Available"));
+				arguments = ast_strdup(S_OR(command->arguments, "Not Available"));
+				seealso = ast_strdup(S_OR(command->seealso, "Not Available"));
 			}
 
-			stxlen = strlen(S_OR(command->syntax, "Not available")) + AST_TERM_MAX_ESCAPE_CHARS;
-			syntax = ast_malloc(stxlen);
-			if (!syntax) {
+			if (!synopsis || !since || !description || !syntax || !arguments || !seealso) {
 				error = 1;
 				goto return_cleanup;
 			}
-			term_color(syntax, S_OR(command->syntax, "Not available"), COLOR_CYAN, 0, stxlen);
 
-			ast_cli(a->fd, "%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n", infotitle, stxtitle, syntax,
-					desctitle, description, syntitle, synopsis, deadtitle, deadcontent,
-					seealsotitle, seealso);
+			ast_cli(a->fd, "\n"
+				"%s  -= Info about AGI '%s' =- %s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n"
+				COLORIZE_FMT "\n"
+				"%s\n\n",
+				ast_term_color(COLOR_MAGENTA, 0), fullcmd, ast_term_reset(),
+				COLORIZE(COLOR_MAGENTA, 0, "[Synopsis]"), synopsis,
+				COLORIZE(COLOR_MAGENTA, 0, "[Since]"), since,
+				COLORIZE(COLOR_MAGENTA, 0, "[Description]"), description,
+				COLORIZE(COLOR_MAGENTA, 0, "[Syntax]"), syntax,
+				COLORIZE(COLOR_MAGENTA, 0, "[Arguments]"), arguments,
+				COLORIZE(COLOR_MAGENTA, 0, "[Runs Dead]"), command->dead ? "Yes" : "No",
+				COLORIZE(COLOR_MAGENTA, 0, "[See Also]"), seealso
+				);
+
 return_cleanup:
 			ast_free(synopsis);
+			ast_free(since);
 			ast_free(description);
 			ast_free(syntax);
+			ast_free(arguments);
 			ast_free(seealso);
 		} else {
 			if (find_command(a->argv + e->args, -1)) {
diff --git a/rest-api-templates/api.wiki.mustache b/rest-api-templates/api.wiki.mustache
index 2680645822..57da975901 100644
--- a/rest-api-templates/api.wiki.mustache
+++ b/rest-api-templates/api.wiki.mustache
@@ -1,11 +1,14 @@
 {{#api_declaration}}
 # {{name_title}}
+{{#since}}
+## Since: {{since}}
+{{/since}}
 
-| Method | Path (Parameters are case-sensitive) | Return Model | Summary |
-|:------ |:------------------------------------ |:------------ |:------- |
+| Method | Path (Parameters are case-sensitive) | Return Model | Summary | Since |
+|:------ |:------------------------------------ |:------------ |:------- |:----- |
 {{#apis}}
 {{#operations}}
-| {{http_method}} | [{{wiki_path}}](#{{nickname_lc}}) | {{#response_class}}{{#is_primitive}}{{name}}{{/is_primitive}}{{^is_primitive}}[{{wiki_name}}]({{wiki_prefix}}Asterisk_REST_Data_Models#{{lc_singular_name}}){{/is_primitive}}{{/response_class}} | {{{summary}}} |
+| {{http_method}} | [{{wiki_path}}](#{{nickname_lc}}) | {{#response_class}}{{#is_primitive}}{{name}}{{/is_primitive}}{{^is_primitive}}[{{wiki_name}}]({{wiki_prefix}}Asterisk_REST_Data_Models#{{lc_singular_name}}){{/is_primitive}}{{/response_class}} | {{{summary}}} | {{since}} |
 {{/operations}}
 {{/apis}}
 {{#apis}}
@@ -14,6 +17,9 @@
 ---
 [//]: # (anchor:{{nickname_lc}})
 ## {{nickname}}
+{{#since}}
+### Since: {{since}}
+{{/since}}
 ### {{http_method}} {{wiki_path}}
 {{{wiki_summary}}}{{#wiki_notes}} {{{wiki_notes}}}{{/wiki_notes}}
 {{#has_path_parameters}}
diff --git a/rest-api-templates/swagger_model.py b/rest-api-templates/swagger_model.py
index 23dcb8cbf1..cfc23a1851 100644
--- a/rest-api-templates/swagger_model.py
+++ b/rest-api-templates/swagger_model.py
@@ -373,6 +373,7 @@ class Operation(Stringify):
         self.summary = None
         self.notes = None
         self.error_responses = []
+        self.since = []
 
     def load(self, op_json, processor, context):
         context = context.next_stack(op_json, 'nickname')
@@ -383,6 +384,8 @@ class Operation(Stringify):
         response_class = op_json.get('responseClass')
         self.response_class = response_class and SwaggerType().load(
             response_class, processor, context)
+        since = op_json.get('since') or []
+        self.since = ", ".join(since)
 
         # Specifying WebSocket URL's is our own extension
         self.is_websocket = op_json.get('upgrade') == 'websocket'
@@ -611,6 +614,7 @@ class ApiDeclaration(Stringify):
         self.api_version = None
         self.base_path = None
         self.resource_path = None
+        self.since = []
         self.apis = []
         self.models = []
 
@@ -658,6 +662,8 @@ class ApiDeclaration(Stringify):
         self.base_path = api_decl_json.get('basePath')
         self.resource_path = api_decl_json.get('resourcePath')
         self.requires_modules = api_decl_json.get('requiresModules') or []
+        since = api_decl_json.get('since') or []
+        self.since = ", ".join(since)
         api_json = api_decl_json.get('apis') or []
         self.apis = [
             Api().load(j, processor, context) for j in api_json]