[gnome-shell] extensions-tool: Add --template create option

[Florian Müllner <fmuellner src gnome org>]

commit 6f6251c0bca96feab20e9cb36aa8e4256f776a29
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Nov 7 12:46:47 2019 +0100

    extensions-tool: Add --template create option
    
    We now have everything in place to allow users to pick a template
    other than the default one (although at the moment it's the only
    one we have), so add a corresponding option.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/812

 .../extensions-tool/completion/bash/gnome-extensions       |  8 ++++++++
 subprojects/extensions-tool/man/gnome-extensions.txt       |  3 +++
 subprojects/extensions-tool/src/command-create.c           | 14 +++++++++++---
 3 files changed, 22 insertions(+), 3 deletions(-)
---
diff --git a/subprojects/extensions-tool/completion/bash/gnome-extensions 
b/subprojects/extensions-tool/completion/bash/gnome-extensions
index 9630ce9d77..05cd039269 100644
--- a/subprojects/extensions-tool/completion/bash/gnome-extensions
+++ b/subprojects/extensions-tool/completion/bash/gnome-extensions
@@ -44,6 +44,14 @@ __gnome_extensions() {
   esac
 
   case "$COMMAND" in
+    create)
+      case "$prev" in
+        --template)
+          COMPREPLY=($(compgen -W "`gnome-extensions create --list-templates`" -- "$2"))
+          return 0
+          ;;
+      esac
+      ;;
     pack)
       case "$prev" in
         --podir|--out-dir|-o)
diff --git a/subprojects/extensions-tool/man/gnome-extensions.txt 
b/subprojects/extensions-tool/man/gnome-extensions.txt
index d94c0bd2e3..adc08e97a2 100644
--- a/subprojects/extensions-tool/man/gnome-extensions.txt
+++ b/subprojects/extensions-tool/man/gnome-extensions.txt
@@ -128,6 +128,9 @@ Creates a new extension from a template.
   *--uuid*='UUID':::
     Set the unique extension ID in the metadata to 'UUID'
 
+  *--template*='TEMPLATE':::
+    Use 'TEMPLATE' as base for the new extension
+
   *-i*:::
   *--interactive*:::
     Prompt for any extension metadata that hasn't been provided
diff --git a/subprojects/extensions-tool/src/command-create.c 
b/subprojects/extensions-tool/src/command-create.c
index d51d4dac64..37a3118bce 100644
--- a/subprojects/extensions-tool/src/command-create.c
+++ b/subprojects/extensions-tool/src/command-create.c
@@ -208,11 +208,14 @@ launch_extension_source (GFile *dir, GError **error)
 }
 
 static gboolean
-create_extension (const char *uuid, const char *name, const char *description)
+create_extension (const char *uuid, const char *name, const char *description, const char *template)
 {
   g_autoptr (GFile) dir = NULL;
   g_autoptr (GError) error = NULL;
 
+  if (template == NULL)
+    template = "plain";
+
   dir = g_file_new_build_filename (g_get_user_data_dir (),
                                    "gnome-shell",
                                    "extensions",
@@ -231,7 +234,7 @@ create_extension (const char *uuid, const char *name, const char *description)
       return FALSE;
     }
 
-  if (!copy_extension_template ("plain", dir, &error))
+  if (!copy_extension_template (template, dir, &error))
     {
       g_printerr ("%s\n", error->message);
       return FALSE;
@@ -328,6 +331,7 @@ handle_create (int argc, char *argv[], gboolean do_help)
   g_autofree char *name = NULL;
   g_autofree char *description = NULL;
   g_autofree char *uuid = NULL;
+  g_autofree char *template = NULL;
   gboolean interactive = FALSE;
   gboolean list_templates = FALSE;
   GOptionEntry entries[] = {
@@ -343,6 +347,10 @@ handle_create (int argc, char *argv[], gboolean do_help)
       .arg_description = _("DESCRIPTION"),
       .arg = G_OPTION_ARG_STRING, .arg_data = &description,
       .description = _("A short description of what the extension does") },
+    { .long_name = "template",
+      .arg = G_OPTION_ARG_STRING, .arg_data = &template,
+      .arg_description = _("TEMPLATE"),
+      .description = _("The template to use for the new extension") },
     { .long_name = "list-templates",
       .arg = G_OPTION_ARG_NONE, .arg_data = &list_templates,
       .flags = G_OPTION_FLAG_HIDDEN },
@@ -403,5 +411,5 @@ handle_create (int argc, char *argv[], gboolean do_help)
       return 1;
     }
 
-  return create_extension (uuid, name, description) ? 0 : 2;
+  return create_extension (uuid, name, description, template) ? 0 : 2;
 }