[gnome-shell] extensions-tool: Prompt for template when appropriate

[Florian Müllner <fmuellner src gnome org>]

commit d229abf07dda281dee3d13e8a544676821a8ea14
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Nov 7 15:16:34 2019 +0100

    extensions-tool: Prompt for template when appropriate
    
    When creating an extension interactively, we currently always use
    the default template unless the --template option is used.
    
    Instead, display the list of available templates to the user and
    prompt them to pick one if it wasn't specified.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/812

 subprojects/extensions-tool/src/command-create.c | 76 +++++++++++++++++++++++-
 1 file changed, 73 insertions(+), 3 deletions(-)
---
diff --git a/subprojects/extensions-tool/src/command-create.c 
b/subprojects/extensions-tool/src/command-create.c
index 37a3118bce..9886afe6de 100644
--- a/subprojects/extensions-tool/src/command-create.c
+++ b/subprojects/extensions-tool/src/command-create.c
@@ -18,6 +18,9 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
+#define _GNU_SOURCE /* for strcasestr */
+#include <string.h>
+
 #include <glib/gi18n.h>
 #include <gio/gio.h>
 #include <gio/gdesktopappinfo.h>
@@ -250,14 +253,15 @@ create_extension (const char *uuid, const char *name, const char *description, c
 }
 
 static void
-prompt_metadata (char **uuid, char **name, char **description)
+prompt_metadata (char **uuid, char **name, char **description, char **template)
 {
   g_autoptr (GInputStream) stdin = NULL;
   g_autoptr (GDataInputStream) istream = NULL;
 
   if ((uuid == NULL || *uuid != NULL) &&
       (name == NULL || *name != NULL) &&
-      (description == NULL || *description != NULL))
+      (description == NULL || *description != NULL) &&
+      (template == NULL || *template != NULL))
     return;
 
   stdin = g_unix_input_stream_new (0, FALSE);
@@ -321,6 +325,72 @@ prompt_metadata (char **uuid, char **name, char **description)
 
       g_print ("\n");
     }
+
+  if (template != NULL && *template == NULL)
+    {
+      g_autoptr (GPtrArray) templates = get_templates ();
+
+      if (templates->len == 1)
+        {
+          GDesktopAppInfo *info = g_ptr_array_index (templates, 0);
+          *template = g_desktop_app_info_get_string (info, TEMPLATE_KEY);
+        }
+      else
+        {
+          int i;
+
+          g_print (_("Choose one of the available templates:\n"));
+          for (i = 0; i < templates->len; i++)
+            {
+              GAppInfo *info = g_ptr_array_index (templates, i);
+              g_print ("%d) %-10s  –  %s\n",
+                       i + 1,
+                       g_app_info_get_name (info),
+                       g_app_info_get_description (info));
+            }
+
+          while (*template == NULL)
+            {
+              g_autofree char *line = NULL;
+
+              g_print ("%s [1-%d]: ", _("Template"), templates->len);
+
+              line = g_data_input_stream_read_line_utf8 (istream, NULL, NULL, NULL);
+
+              if (line == NULL)
+                continue;
+
+              if (g_ascii_isdigit (*line))
+                {
+                  long i = strtol (line, NULL, 10);
+
+                  if (i > 0 && i <= templates->len)
+                    {
+                      GDesktopAppInfo *info;
+
+                      info = g_ptr_array_index (templates, i - 1);
+                      *template =
+                        g_desktop_app_info_get_string (info, TEMPLATE_KEY);
+                    }
+                }
+              else
+                {
+                  for (i = 0; i < templates->len; i++)
+                    {
+                      GDesktopAppInfo *info = g_ptr_array_index (templates, i);
+                      g_autofree char *cur_template = NULL;
+
+                      cur_template =
+                        g_desktop_app_info_get_string (info, TEMPLATE_KEY);
+
+                      if (strcasestr (cur_template, line) != NULL)
+                        *template = g_steal_pointer (&cur_template);
+                    }
+                }
+            }
+          g_print ("\n");
+        }
+    }
 }
 
 int
@@ -403,7 +473,7 @@ handle_create (int argc, char *argv[], gboolean do_help)
     }
 
   if (interactive)
-    prompt_metadata (&uuid, &name, &description);
+    prompt_metadata (&uuid, &name, &description, &template);
 
   if (uuid == NULL || name == NULL || description == NULL)
     {