[Qemu-devel] [PATCH V2 5/7] monitor: support sub commands in auto completion

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

This patch allow auot completion work normal in sub command case,
"info block [DEVICE]" can auto complete now, by re-enter the completion
function. Also, original "info" is treated as a special case, now it is
treated as a sub command group, global variable info_cmds is not used
any more.

"help" command is still treated as a special case, since it is not a sub
command group but want to auto complete command in root command table.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 monitor.c |   36 ++++++++++++++++++++++++------------
 1 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/monitor.c b/monitor.c
index aa641de..f364a0d 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4179,10 +4179,11 @@ static const char *next_arg_type(const char *typestr)
     return (p != NULL ? ++p : typestr);
 }
 
-static void monitor_find_completion(Monitor *mon,
-                                    const char *cmdline)
+static void monitor_find_completion_by_table(Monitor *mon,
+                                             const mon_cmd_t *cmd_table,
+                                             const char *cmdline)
 {
-    const char *cmdname;
+    const char *cmdname, *p;
     char *args[MAX_ARGS];
     int nb_args, i, len;
     const char *ptype, *str;
@@ -4212,12 +4213,12 @@ static void monitor_find_completion(Monitor *mon,
         else
             cmdname = args[0];
         readline_set_completion_index(mon->rs, strlen(cmdname));
-        for (cmd = mon->cmd_table; cmd->name != NULL; cmd++) {
+        for (cmd = cmd_table; cmd->name != NULL; cmd++) {
             cmd_completion(mon, cmdname, cmd->name);
         }
     } else {
         /* find the command */
-        for (cmd = mon->cmd_table; cmd->name != NULL; cmd++) {
+        for (cmd = cmd_table; cmd->name != NULL; cmd++) {
             if (compare_cmd(args[0], cmd->name)) {
                 break;
             }
@@ -4226,6 +4227,17 @@ static void monitor_find_completion(Monitor *mon,
             goto cleanup;
         }
 
+        /* locate next valid string in original cmdline used by re-enter */
+        p = cmdline + strlen(args[0]);
+        while (qemu_isspace(*p)) {
+            p++;
+        }
+
+        if (cmd->sub_table) {
+            monitor_find_completion_by_table(mon, cmd->sub_table, p);
+            goto cleanup;
+        }
+
         ptype = next_arg_type(cmd->args_type);
         for(i = 0; i < nb_args - 2; i++) {
             if (*ptype != '\0') {
@@ -4252,13 +4264,7 @@ static void monitor_find_completion(Monitor *mon,
             bdrv_iterate(block_completion_it, &mbs);
             break;
         case 's':
-            /* XXX: more generic ? */
-            if (!strcmp(cmd->name, "info")) {
-                readline_set_completion_index(mon->rs, strlen(str));
-                for(cmd = info_cmds; cmd->name != NULL; cmd++) {
-                    cmd_completion(mon, str, cmd->name);
-                }
-            } else if (!strcmp(cmd->name, "sendkey")) {
+            if (!strcmp(cmd->name, "sendkey")) {
                 char *sep = strrchr(str, '-');
                 if (sep)
                     str = sep + 1;
@@ -4284,6 +4290,12 @@ cleanup:
     }
 }
 
+static void monitor_find_completion(Monitor *mon,
+                                    const char *cmdline)
+{
+    return monitor_find_completion_by_table(mon, mon->cmd_table, cmdline);
+}
+
 static int monitor_can_read(void *opaque)
 {
     Monitor *mon = opaque;
-- 
1.7.1