[PATCH] virsh: add custom readline generator

[Lai Jiangshan <laijs@xxxxxxxxxxxxxx>]

Custom readline generator will help for some usecase.

Also add a custom readline generator for the "help" command.

Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
---
diff --git a/tools/virsh.c b/tools/virsh.c
index fcd254d..51e43c1 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -13575,7 +13575,7 @@ vshCloseLogFile(vshControl *ctl)
  * (i.e. STATE == 0), then we start at the top of the list.
  */
 static char *
-vshReadlineCommandGenerator(const char *text, int state)
+vshReadlineCmdAndGrpGenerator(const char *text, int state, int grpname)
 {
     static int grp_list_index, cmd_list_index, len;
     const char *name;
@@ -13604,8 +13604,13 @@ vshReadlineCommandGenerator(const char *text, int state)
                     return vshStrdup(NULL, name);
             }
         } else {
+            name = grp[grp_list_index].keyword;
             cmd_list_index = 0;
             grp_list_index++;
+
+            if (grpname && STREQLEN(name, text, len))
+                return vshStrdup(NULL, name);
+
         }
     }
 
@@ -13614,10 +13619,45 @@ vshReadlineCommandGenerator(const char *text, int state)
 }
 
 static char *
+vshReadlineCommandGenerator(const char *text, int state)
+{
+	return vshReadlineCmdAndGrpGenerator(text, state, 0);
+}
+
+static char *
+vshReadlineHelpOptionGenerator(const char *text, int state)
+{
+	return vshReadlineCmdAndGrpGenerator(text, state, 1);
+}
+
+struct vshCustomReadLine {
+	const char *name;
+	char *(*CustomReadLineOptionGenerator)(const char *text, int state);
+};
+
+struct vshCustomReadLine customeReadLine[] = {
+	{ "help", vshReadlineHelpOptionGenerator },
+	{ NULL, NULL }
+};
+
+static struct vshCustomReadLine *vshCustomReadLineSearch(const char *name)
+{
+    struct vshCustomReadLine *ret = customeReadLine;
+
+    for (ret = customeReadLine; ret->name; ret++) {
+        if (STREQ(ret->name, name))
+            return ret;
+    }
+
+    return NULL;
+}
+
+static char *
 vshReadlineOptionsGenerator(const char *text, int state)
 {
     static int list_index, len;
     static const vshCmdDef *cmd = NULL;
+    static const struct vshCustomReadLine *rl = NULL;
     const char *name;
 
     if (!state) {
@@ -13632,6 +13672,7 @@ vshReadlineOptionsGenerator(const char *text, int state)
         memcpy(cmdname, rl_line_buffer, p - rl_line_buffer);
 
         cmd = vshCmddefSearch(cmdname);
+        rl = vshCustomReadLineSearch(cmdname);
         list_index = 0;
         len = strlen(text);
         VIR_FREE(cmdname);
@@ -13640,6 +13681,9 @@ vshReadlineOptionsGenerator(const char *text, int state)
     if (!cmd)
         return NULL;
 
+    if (rl)
+        return rl->CustomReadLineOptionGenerator(text, state);
+
     if (!cmd->opts)
         return NULL;
 

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