Add a file information dialog based on ExifTool

Right now, it isn't very pleasing to use.

README.adoc

@@ -5,8 +5,7 @@ fastiv
 raw photos, HEIC, AVIF, WebP, SVG, X11 cursors and TIFF, or whatever gdk-pixbuf
 loads.
 
-It still has some road to go, but it's already become quite usable,
+Its development status can be summarized as '`beta`'.
-and it has received basic polishing.
 
 Non-goals
 ---------
@@ -27,7 +26,7 @@ Build dependencies: Meson, pkg-config +
 Runtime dependencies: gtk+-3.0, glib>=2.64, pixman-1, shared-mime-info,
 spng>=0.7.0, libturbojpeg +
 Optional dependencies: LibRaw, librsvg-2.0, xcursor, libwebp, libheif, libtiff,
-gdk-pixbuf-2.0
+gdk-pixbuf-2.0, ExifTool
 
  $ git clone --recursive https://git.janouch.name/p/fastiv.git
  $ meson builddir

fastiv.c

@@ -147,6 +147,7 @@ static struct key_group help_keys_view[] = {
 		{"<control>p", "Print..."},
 		{"<control>s", "Save page as..."},
 		{"<control><shift>s", "Save frame as..."},
+		{"<alt>Return", "Show file information"},
 		{}
 	}},
 	{}
@@ -203,7 +204,6 @@ make_key_window(void)
 
 // TODO(p): See if it's possible to give separators room to shrink
 // by some minor amount of pixels, margin-wise.
-// TODO(p): Implement commented-out actions.
 #define B make_toolbar_button
 #define T make_toolbar_toggle
 #define TOOLBAR(XX) \
@@ -234,7 +234,7 @@ make_key_window(void)
 	/* XX(COLOR,      B("preferences-color-symbolic", "Color management")) */ \
 	XX(SAVE,          B("document-save-as-symbolic", "Save as...")) \
 	XX(PRINT,         B("document-print-symbolic", "Print...")) \
-	/* XX(INFO,       B("info-symbolic", "Information")) */ \
+	XX(INFO,          B("info-symbolic", "Information")) \
 	XX(S5,            gtk_separator_new(GTK_ORIENTATION_HORIZONTAL)) \
 	XX(LEFT,          B("object-rotate-left-symbolic", "Rotate left")) \
 	XX(MIRROR,        B("object-flip-horizontal-symbolic", "Mirror")) \
@@ -948,6 +948,7 @@ on_view_actions_changed(void)
 	gtk_widget_set_sensitive(g.toolbar[TOOLBAR_CHECKERBOARD], has_image);
 	gtk_widget_set_sensitive(g.toolbar[TOOLBAR_SAVE], has_image);
 	gtk_widget_set_sensitive(g.toolbar[TOOLBAR_PRINT], has_image);
+	gtk_widget_set_sensitive(g.toolbar[TOOLBAR_INFO], has_image);
 
 	gtk_widget_set_sensitive(g.toolbar[TOOLBAR_LEFT], has_image);
 	gtk_widget_set_sensitive(g.toolbar[TOOLBAR_MIRROR], has_image);
@@ -1092,6 +1093,7 @@ make_view_toolbar(void)
 	toolbar_toggler(TOOLBAR_CHECKERBOARD,  "checkerboard");
 	toolbar_command(TOOLBAR_PRINT,         FIV_VIEW_COMMAND_PRINT);
 	toolbar_command(TOOLBAR_SAVE,          FIV_VIEW_COMMAND_SAVE_PAGE);
+	toolbar_command(TOOLBAR_INFO,          FIV_VIEW_COMMAND_INFO);
 	toolbar_command(TOOLBAR_LEFT,          FIV_VIEW_COMMAND_ROTATE_LEFT);
 	toolbar_command(TOOLBAR_MIRROR,        FIV_VIEW_COMMAND_MIRROR);
 	toolbar_command(TOOLBAR_RIGHT,         FIV_VIEW_COMMAND_ROTATE_RIGHT);

fiv-view.c

@@ -786,6 +786,76 @@ save_as(FivView *self, gboolean frame)
 	}
 }
 
+static void
+info(FivView *self)
+{
+	// TODO(p): Add a fallback to internal capabilities.
+	// The simplest is to specify the filename and the resolution.
+	GtkWindow *window = get_toplevel(GTK_WIDGET(self));
+	int flags = G_SUBPROCESS_FLAGS_STDOUT_PIPE | G_SUBPROCESS_FLAGS_STDERR_PIPE;
+
+	GError *error = NULL;
+	GSubprocess *subprocess = g_subprocess_new(flags, &error, "exiftool",
+		"-tab", "-groupNames", "-duplicates", "-extractEmbedded", "--binary",
+		"-quiet", "--", self->path, NULL);
+	if (error) {
+		show_error_dialog(window, error);
+		return;
+	}
+
+	gchar *out = NULL, *err = NULL;
+	if (!g_subprocess_communicate_utf8(
+			subprocess, NULL, NULL, &out, &err, &error)) {
+		show_error_dialog(window, error);
+		return;
+	}
+
+	GtkWidget *dialog = gtk_widget_new(GTK_TYPE_DIALOG,
+		"use-header-bar", TRUE,
+		"title", "Information",
+		"transient-for", window,
+		"destroy-with-parent", TRUE, NULL);
+
+	GtkWidget *content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog));
+	if (*err) {
+		GtkWidget *info = gtk_info_bar_new();
+		GtkInfoBar *info_bar = GTK_INFO_BAR(info);
+		gtk_info_bar_set_message_type(info_bar, GTK_MESSAGE_WARNING);
+
+		GtkWidget *info_area = gtk_info_bar_get_content_area(info_bar);
+		GtkWidget *label = gtk_label_new(g_strstrip(err));
+		gtk_container_add(GTK_CONTAINER(info_area), label);
+
+		gtk_container_add(GTK_CONTAINER(content_area), info);
+	}
+
+	// TODO(p): Parse as GROUP\tTAG\tVALUE, do s/_/ /g in the group name,
+	// put the data in a GtkTreeModel/GtkTreeView.
+	GtkWidget *label = gtk_label_new(out);
+	gtk_label_set_selectable(GTK_LABEL(label), TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 0.);
+	gtk_label_set_yalign(GTK_LABEL(label), 0.);
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_widget_set_vexpand(label, TRUE);
+
+	GtkWidget *scroller = gtk_scrolled_window_new(NULL, NULL);
+	gtk_scrolled_window_set_max_content_width(
+		GTK_SCROLLED_WINDOW(scroller), 800);
+	gtk_scrolled_window_set_max_content_height(
+		GTK_SCROLLED_WINDOW(scroller), 800);
+	gtk_scrolled_window_set_propagate_natural_width(
+		GTK_SCROLLED_WINDOW(scroller), TRUE);
+	gtk_scrolled_window_set_propagate_natural_height(
+		GTK_SCROLLED_WINDOW(scroller), TRUE);
+	gtk_container_add(GTK_CONTAINER(scroller), label);
+	gtk_container_add(GTK_CONTAINER(content_area), scroller);
+
+	g_free(out);
+	g_free(err);
+	g_object_unref(subprocess);
+	gtk_widget_show_all(dialog);
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 static inline gboolean
@@ -823,6 +893,12 @@ fiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
 			return save_as(self, TRUE);
 		}
 	}
+	if (state == GDK_MOD1_MASK) {
+		switch (event->keyval) {
+		case GDK_KEY_Return:
+			return command(self, FIV_VIEW_COMMAND_INFO);
+		}
+	}
 	if (state != 0)
 		return FALSE;
 
@@ -1043,6 +1119,8 @@ fiv_view_command(FivView *self, FivViewCommand command)
 		print(self);
 	break; case FIV_VIEW_COMMAND_SAVE_PAGE:
 		save_as(self, FALSE);
+	break; case FIV_VIEW_COMMAND_INFO:
+		info(self);
 
 	break; case FIV_VIEW_COMMAND_ZOOM_IN:
 		set_scale(self, self->scale * SCALE_STEP);

fiv-view.h

@@ -45,6 +45,7 @@ typedef enum _FivViewCommand {
 	FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD,
 	FIV_VIEW_COMMAND_PRINT,
 	FIV_VIEW_COMMAND_SAVE_PAGE,
+	FIV_VIEW_COMMAND_INFO,
 
 	FIV_VIEW_COMMAND_ZOOM_IN,
 	FIV_VIEW_COMMAND_ZOOM_OUT,