[PATCH 07/11] vsh: Introduce complete command

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

This command is going to be called from bash completion script in
the following form:

  virsh complete "start --domain"

Its only purpose is to return list of possible strings for
completion. Note that this is a 'hidden', unlisted command and
therefore there's no documentation to it.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 tools/virsh.c      |  1 +
 tools/virt-admin.c |  1 +
 tools/vsh.c        | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/vsh.h        | 14 +++++++++++
 4 files changed, 84 insertions(+)

diff --git a/tools/virsh.c b/tools/virsh.c
index 7d6dc2620..f830331f6 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -846,6 +846,7 @@ static const vshCmdDef virshCmds[] = {
     VSH_CMD_PWD,
     VSH_CMD_QUIT,
     VSH_CMD_SELF_TEST,
+    VSH_CMD_COMPLETE,
     {.name = "connect",
      .handler = cmdConnect,
      .opts = opts_connect,
diff --git a/tools/virt-admin.c b/tools/virt-admin.c
index 5d7ef7988..c24ed95c0 100644
--- a/tools/virt-admin.c
+++ b/tools/virt-admin.c
@@ -1356,6 +1356,7 @@ static const vshCmdDef vshAdmCmds[] = {
     VSH_CMD_PWD,
     VSH_CMD_QUIT,
     VSH_CMD_SELF_TEST,
+    VSH_CMD_COMPLETE,
     {.name = "uri",
      .handler = cmdURI,
      .opts = NULL,
diff --git a/tools/vsh.c b/tools/vsh.c
index 121669574..136acb0ab 100644
--- a/tools/vsh.c
+++ b/tools/vsh.c
@@ -3419,3 +3419,71 @@ cmdSelfTest(vshControl *ctl ATTRIBUTE_UNUSED,
 
     return true;
 }
+
+/* ----------------------
+ * Autocompletion command
+ * ---------------------- */
+
+const vshCmdOptDef opts_complete[] = {
+    {.name = "string",
+     .type = VSH_OT_ARGV,
+     .flags = VSH_OFLAG_EMPTY_OK,
+     .help = N_("partial string to autocomplete")
+    },
+    {.name = NULL}
+};
+
+const vshCmdInfo info_complete[] = {
+    {.name = "help",
+     .data = N_("internal command for autocompletion")
+    },
+    {.name = "desc",
+     .data = N_("internal use only")
+    },
+    {.name = NULL}
+};
+
+bool
+cmdComplete(vshControl *ctl, const vshCmd *cmd)
+{
+    bool ret = false;
+#ifdef WITH_READLINE
+    const vshClientHooks *hooks = ctl->hooks;
+    int stdin_fileno = STDIN_FILENO;
+    const char *arg = NULL;
+    char **matches = NULL, *tmp = NULL, **iter;
+
+    if (vshCommandOptStringQuiet(ctl, cmd, "string", &arg) <= 0)
+        goto cleanup;
+
+    /* This command is flagged VSH_CMD_FLAG_NOCONNECT because we
+     * need to prevent auth hooks reading any input. Therefore we
+     * have to close stdin and then connect ourselves. */
+    VIR_FORCE_CLOSE(stdin_fileno);
+
+    if (!(hooks && hooks->connHandler && hooks->connHandler(ctl, true)))
+        goto cleanup;
+
+    autoCompleteOpaque = ctl;
+
+    rl_basic_word_break_characters = " \t\n\\`@$><=;|&{(";
+    if (VIR_STRDUP(rl_line_buffer, arg) < 0)
+        goto cleanup;
+
+    while ((tmp = strpbrk(arg, rl_basic_word_break_characters)))
+        arg = tmp + 1;
+
+    if (!(matches = vshReadlineCompletion(arg, 0, 0)))
+        goto cleanup;
+
+    for (iter = matches; *iter; iter++)
+        printf("%s\n", *iter);
+
+    ret = true;
+ cleanup:
+    for (iter = matches; iter && *iter; iter++)
+        VIR_FREE(*iter);
+    VIR_FREE(matches);
+#endif /* WITH_READLINE */
+    return ret;
+}
diff --git a/tools/vsh.h b/tools/vsh.h
index c5a62e593..f55ba86f0 100644
--- a/tools/vsh.h
+++ b/tools/vsh.h
@@ -382,6 +382,8 @@ extern const vshCmdInfo info_echo[];
 extern const vshCmdInfo info_pwd[];
 extern const vshCmdInfo info_quit[];
 extern const vshCmdInfo info_selftest[];
+extern const vshCmdOptDef opts_complete[];
+extern const vshCmdInfo info_complete[];
 
 bool cmdHelp(vshControl *ctl, const vshCmd *cmd);
 bool cmdCd(vshControl *ctl, const vshCmd *cmd);
@@ -389,6 +391,7 @@ bool cmdEcho(vshControl *ctl, const vshCmd *cmd);
 bool cmdPwd(vshControl *ctl, const vshCmd *cmd);
 bool cmdQuit(vshControl *ctl, const vshCmd *cmd);
 bool cmdSelfTest(vshControl *ctl, const vshCmd *cmd);
+bool cmdComplete(vshControl *ctl, const vshCmd *cmd);
 
 # define VSH_CMD_CD \
     { \
@@ -454,6 +457,17 @@ bool cmdSelfTest(vshControl *ctl, const vshCmd *cmd);
         .alias = "self-test" \
     }
 
+# define VSH_CMD_COMPLETE \
+    { \
+        .name = "complete", \
+        .handler = cmdComplete, \
+        .opts = opts_complete, \
+        .info = info_complete, \
+        .flags = VSH_CMD_FLAG_NOCONNECT | VSH_CMD_FLAG_ALIAS, \
+        .alias = "complete" \
+    }
+
+
 
 /* readline */
 char * vshReadline(vshControl *ctl, const char *prompt);
-- 
2.13.6

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