[PATCH 55 of 55 RFC c-hglib:level1] hg_version: creating a high level function for mercurial version command

[Iulian Stana]

# HG changeset patch
# User Iulian Stana <julian.stana at gmail.com>
# Date 1379118651 -10800
#      Sat Sep 14 03:30:51 2013 +0300
# Node ID 6edd42c46d96dfb9a5e8e9e467b2f859c86c46cb
# Parent  6f885ae8f3c02696497e3a31c768629c0b5bf481
hg_version: creating a high level function for mercurial version command

diff --git a/client.c b/client.c
--- a/client.c
+++ b/client.c
@@ -1489,6 +1489,34 @@
 	return out;
 }
 
+/* The high level version command for hglib API. */
+char *hg_version(hg_handle *handle, int(*callback)(const char *msg, 
+								size_t len))
+{
+	int exitcode;
+	char **command = cmdbuilder("version", NULL , NULL);
+
+	if(hg_rawcommand(handle, command) < 0){
+		return NULL;
+	}
+	free(command);
+
+	exitcode = hg_runcommand(handle, callback, NULL);
+	if(exitcode)
+		return NULL;
+
+	char *out = get_output_data(handle);
+	char *origin = out;
+	char *version;
+	out = strstr(out, "version");
+	/* len('version ') == 8 */
+	version = out + 8;
+	out = strstr(out, ")");
+	origin[out - origin] = '\0';
+
+	return version;
+}
+
 /* The yield next step. Getting the next entry. */
 int hg_fetch_entry(hg_stream_buffer *stream, int (*detect_byte)(char *buff, 
 			int buf_size, int data_on_pipe), int func_type)
diff --git a/client.h b/client.h
--- a/client.h
+++ b/client.h
@@ -2328,6 +2328,25 @@
 								size_t len));
 
 /**
+ * \brief hg_version command for hglib API.
+ *
+ * Return hg version that runs the command server
+ *
+ * \param handle The handle of the connection, wherewith I want to communicate
+ * \param callback A function that will handle error data. 
+ *                 A NULL pointer will ignore error data.
+ * \retval version  Return the hg version. Also will indicate the end of 
+ *                  version_command.
+ * \retval NULL To indicate an error.
+ *
+ * errno can be:
+ *      - hg_rawcommand errors
+ *
+ * */
+char *hg_version(hg_handle *handle, int(*callback)(const char *msg, 
+								size_t len));
+
+/**
  * \brief The yield mechanism that will get the next entry.
  *
  * This function is used inside of hg_fetch_cset_entry() and hg_fetch_line_entry()