[goffice] GOFileSaver: add flag for whether fs can do sheet selection.

[Morten Welinder <mortenw src gnome org>]

commit 77b9b1f78fdda9789167d6e18fade825ef26e479
Author: Morten Welinder <terra gnome org>
Date:   Thu May 10 13:20:15 2018 -0400

    GOFileSaver: add flag for whether fs can do sheet selection.
    
    Text exporters generally can export any subset of sheets whereas true
    spreadsheet formats generally do all or nothing.

 NEWS                                  |    1 +
 goffice/app/file-priv.h               |    9 +++++----
 goffice/app/file.c                    |   19 ++++++++++++++++++-
 goffice/app/go-plugin-loader-module.c |    3 +--
 goffice/app/go-plugin-service.c       |   10 ++++++++++
 5 files changed, 35 insertions(+), 7 deletions(-)
---
diff --git a/NEWS b/NEWS
index 935fa56..00f9b03 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,7 @@ goffice 0.10.42:
 
 Morten:
        * Introspection fixes.
+       * Improve file saver api.
 
 --------------------------------------------------------------------------
 goffice 0.10.41:
diff --git a/goffice/app/file-priv.h b/goffice/app/file-priv.h
index 3a8c5c9..1c188a8 100644
--- a/goffice/app/file-priv.h
+++ b/goffice/app/file-priv.h
@@ -92,10 +92,11 @@ struct _GOFileSaver {
        gchar                *mime_type;
        gchar                *extension;
        gchar                *description;
-       gboolean              overwrite_files;
-       gboolean              interactive_only;
-       GOFileFormatLevel       format_level;
-       GOFileSaveScope         save_scope;
+       guint                 overwrite_files : 1;
+       guint                 interactive_only : 1;
+       guint                 sheet_selection : 1;
+       GOFileFormatLevel     format_level;
+       GOFileSaveScope       save_scope;
        GOFileSaverSaveFunc   save_func;
 };
 
diff --git a/goffice/app/file.c b/goffice/app/file.c
index cdd02aa..0d5c892 100644
--- a/goffice/app/file.c
+++ b/goffice/app/file.c
@@ -501,7 +501,8 @@ enum {
        FS_PROP_OVERWRITE,
        FS_PROP_INTERACTIVE_ONLY,
        FS_PROP_FORMAT_LEVEL,
-       FS_PROP_SCOPE
+       FS_PROP_SCOPE,
+       FS_PROP_SHEET_SELECTION
 };
 
 enum {
@@ -554,6 +555,9 @@ go_file_saver_set_property (GObject *object, guint property_id,
        case FS_PROP_SCOPE:
                fs->save_scope = g_value_get_enum (value);
                break;
+       case FS_PROP_SHEET_SELECTION:
+               fs->sheet_selection = g_value_get_boolean (value);
+               break;
        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
                break;
@@ -591,6 +595,9 @@ go_file_saver_get_property (GObject *object, guint property_id,
        case FS_PROP_SCOPE:
                g_value_set_enum (value, fs->save_scope);
                break;
+       case FS_PROP_SHEET_SELECTION:
+               g_value_set_boolean (value, fs->sheet_selection);
+               break;
        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
                break;
@@ -702,6 +709,16 @@ go_file_saver_class_init (GOFileSaverClass *klass)
                                    GSF_PARAM_STATIC |
                                    G_PARAM_READWRITE));
 
+        g_object_class_install_property
+               (goc,
+                FS_PROP_SHEET_SELECTION,
+                g_param_spec_boolean ("sheet-selection",
+                                     _("Sheet Selection"),
+                                     _("TRUE if this saver supports saving a subset of all sheet"),
+                                      FALSE,
+                                      GSF_PARAM_STATIC |
+                                      G_PARAM_READWRITE));
+
        klass->save = go_file_saver_save_real;
 
        /* class signals */
diff --git a/goffice/app/go-plugin-loader-module.c b/goffice/app/go-plugin-loader-module.c
index a22a03d..5412b75 100644
--- a/goffice/app/go-plugin-loader-module.c
+++ b/goffice/app/go-plugin-loader-module.c
@@ -24,7 +24,6 @@
 #include "module-plugin-defs.h"
 
 #include <goffice/app/file.h>
-#include <goffice/app/file-priv.h>
 #include <goffice/app/go-plugin.h>
 #include <goffice/app/go-plugin-service.h>
 #include <goffice/app/go-plugin-loader.h>
@@ -270,7 +269,7 @@ go_plugin_loader_module_func_file_open (GOFileOpener const *fo, GOPluginService
        g_return_if_fail (input != NULL);
 
        loader_data = g_object_get_data (G_OBJECT (service), "loader_data");
-       if (fo->encoding_dependent) {
+       if (go_file_opener_is_encoding_dependent (fo)) {
                void (*module_func_file_open) (GOFileOpener const *fo, char const *enc,
                                               GOIOContext *io_context,
                                               GoView *view,
diff --git a/goffice/app/go-plugin-service.c b/goffice/app/go-plugin-service.c
index 7e24bdc..254b797 100644
--- a/goffice/app/go-plugin-service.c
+++ b/goffice/app/go-plugin-service.c
@@ -755,6 +755,8 @@ struct _GOPluginServiceFileSaver {
        gint   default_saver_priority;
        GOFileSaveScope save_scope;
        gboolean overwrite_files;
+       gboolean interactive_only;
+       gboolean sheet_selection;
 
        GOFileSaver *saver;
        GOPluginServiceFileSaverCallbacks cbs;
@@ -835,6 +837,12 @@ go_plugin_service_file_saver_read_xml (GOPluginService *service, xmlNode *tree,
 
                if (!go_xml_node_get_bool (tree, "overwrite_files", &(psfs->overwrite_files)))
                        psfs->overwrite_files = TRUE;
+
+               if (!go_xml_node_get_bool (tree, "interactive_only", &(psfs->interactive_only)))
+                       psfs->interactive_only = FALSE;
+
+               if (!go_xml_node_get_bool (tree, "sheet_selection", &(psfs->sheet_selection)))
+                       psfs->sheet_selection = FALSE;
        } else {
                *ret_error = go_error_info_new_str (_("File saver has no description"));
        }
@@ -980,7 +988,9 @@ go_plugin_file_saver_new (GOPluginService *service)
                                    "description", psfs->description,
                                    "format-level", psfs->format_level,
                                    "overwrite", psfs->overwrite_files,
+                                   "interactive-only", psfs->interactive_only,
                                    "scope", psfs->save_scope,
+                                   "sheet-selection", psfs->sheet_selection,
                                    NULL));
 
        pfs->service = service;