repmgr: add --terse mode to "cluster show"

This suppresses display of the usually lengthy "conninfo" column, mainly
useful for generating a compact table suitable for pasting into emails,
chats etc. without messy line breaks.

Implements GitHub #521.

HISTORY

@@ -1,5 +1,6 @@
 4.3     2019-??
         repmgr: add --version-number command line option (Ian)
+        repmgr: add --terse option to "cluster show"; GitHub #521 (Ian)
         repmgrd: check binary and extension major versions match; GitHub #515 (Ian)
 
 4.2.1   2018-??-??

doc/appendix-release-notes.sgml

@@ -26,6 +26,15 @@
       <para>
        <itemizedlist>
 
+          <listitem>
+            <para>
+              Add <option>--terse</option> to <command><link linkend="repmgr-cluster-show">repmgr cluster show</link></command> (GitHub #521).
+            </para>
+            <para>
+              This makes it easier to copy the output into emails, chats etc. as a compact table.
+            </para>
+          </listitem>
+
           <listitem>
             <para>
               <command>repmgr --version-number</command> outputs the &quot;raw&quot;
@@ -34,6 +43,7 @@
               of the &repmgr; version.
             </para>
           </listitem>
+
        </itemizedlist>
       </para>
     </sect2>

doc/repmgr-cluster-show.sgml

@@ -120,6 +120,15 @@
 		</listitem>
 	  </varlistentry>
 
+      <varlistentry>
+        <term><option>--terse</option></term>
+        <listitem>
+          <para>
+			Suppress display of the <literal>conninfo</literal> column.
+          </para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>--verbose</option></term>
         <listitem>

repmgr-action-cluster.c

@@ -102,6 +102,7 @@ do_cluster_show(void)
 		exit(ERR_BAD_CONFIG);
 	}
 
+	/* Initialize column headers  */
 	strncpy(headers_show[SHOW_ID].title, _("ID"), MAXLEN);
 	strncpy(headers_show[SHOW_NAME].title, _("Name"), MAXLEN);
 	strncpy(headers_show[SHOW_ROLE].title, _("Role"), MAXLEN);
@@ -117,7 +118,20 @@ do_cluster_show(void)
 
 	for (i = 0; i < SHOW_HEADER_COUNT; i++)
 	{
-		headers_show[i].max_length = strlen(headers_show[i].title);
+		headers_show[i].display = true;
+
+		if (runtime_options.terse == true)
+		{
+			if (i == SHOW_CONNINFO)
+			{
+				headers_show[i].display = false;
+			}
+		}
+
+		if (headers_show[i].display == true)
+		{
+			headers_show[i].max_length = strlen(headers_show[i].title);
+		}
 	}
 
 	for (cell = nodes.head; cell; cell = cell->next)
@@ -347,6 +361,12 @@ do_cluster_show(void)
 
 		for (i = 0; i < SHOW_HEADER_COUNT; i++)
 		{
+			if (runtime_options.terse == true)
+			{
+				if (headers_show[i].display == false)
+					continue;
+			}
+
 			if (headers_show[i].cur_length > headers_show[i].max_length)
 			{
 				headers_show[i].max_length = headers_show[i].cur_length;
@@ -398,7 +418,13 @@ do_cluster_show(void)
 			printf("| %-*s ", headers_show[SHOW_STATUS].max_length, cell->node_info->details);
 			printf("| %-*s ", headers_show[SHOW_UPSTREAM_NAME].max_length, cell->node_info->upstream_node_name);
 			printf("| %-*s ", headers_show[SHOW_LOCATION].max_length, cell->node_info->location);
-			printf("| %-*s\n", headers_show[SHOW_CONNINFO].max_length, cell->node_info->conninfo);
+
+			if (headers_show[SHOW_CONNINFO].display == true)
+			{
+				printf("| %-*s", headers_show[SHOW_CONNINFO].max_length, cell->node_info->conninfo);
+			}
+
+			puts("");
 		}
 	}
 

repmgr-action-daemon.c

@@ -91,6 +91,7 @@ do_daemon_status(void)
 	for (i = 0; i < STATUS_HEADER_COUNT; i++)
 	{
 		headers_status[i].max_length = strlen(headers_status[i].title);
+		headers_status[i].display = true;
 	}
 
 	i = 0;

repmgr-client-global.h

@@ -199,6 +199,7 @@ typedef struct ColHeader
 	char		title[MAXLEN];
 	int			max_length;
 	int			cur_length;
+	bool		display;
 } ColHeader;
 
 

repmgr-client.c

@@ -1947,9 +1947,20 @@ void
 print_status_header(int cols, ColHeader *headers)
 {
 	int i;
+	int max_cols = 0;
+
+	/* count how many columns we actually need to display */
+	for (i = 0; i < cols; i++)
+	{
+		if (headers[i].display == true)
+			max_cols ++;
+	}
 
 	for (i = 0; i < cols; i++)
 	{
+		if (headers[i].display == false)
+			continue;
+
 		if (i == 0)
 			printf(" ");
 		else
@@ -1959,17 +1970,22 @@ print_status_header(int cols, ColHeader *headers)
 			   headers[i].max_length,
 			   headers[i].title);
 	}
+
+
 	printf("\n");
 	printf("-");
 
-	for (i = 0; i < cols; i++)
+	for (i = 0; i < max_cols; i++)
 	{
 		int			j;
 
+		if (headers[i].display == false)
+			continue;
+
 		for (j = 0; j < headers[i].max_length; j++)
 			printf("-");
 
-		if (i < (cols - 1))
+		if (i < (max_cols - 1))
 			printf("-+-");
 		else
 			printf("-");