Temporarily put file information in GtkTreeView

It's aligned and prettier than the label before, but it sucks ass.

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,
-and it has received basic polishing.
+Its development status can be summarized as '`beta`'.
 
 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

@@ -52,7 +52,7 @@ exit_fatal(const gchar *format, ...)
 	exit(EXIT_FAILURE);
 }
 
-// --- Help --------------------------------------------------------------------
+// --- Keyboard shortcuts ------------------------------------------------------
 // Fuck XML, this can be easily represented in static structures.
 // Though it would be nice if the accelerators could be customized.
 
@@ -81,76 +81,81 @@ static struct key help_keys_general[] = {
 	{}
 };
 
+static struct key_group help_keys_browser[] = {
+	{"General", help_keys_general},
+	{"View", (struct key[]) {
+		{"F9", "Toggle navigation sidebar"},
+		{}
+	}},
+	{"Navigation", (struct key[]) {
+		{"<control>l", "Open location..."},
+		{"<control>n", "Open a new window"},
+		{"<alt>Left", "Go back in history"},
+		{"<alt>Right", "Go forward in history"},
+		{"<alt>Up", "Go to parent directory"},
+		{"<alt>Home", "Go home"},
+		{"F5 r <control>r", "Refresh"},
+		{}
+	}},
+	{}
+};
+
+static struct key_group help_keys_view[] = {
+	{"General", help_keys_general},
+	{"View", (struct key[]) {
+		{"F8", "Toggle toolbar"},
+		{}
+	}},
+	{"Navigation", (struct key[]) {
+		{"<control>l", "Open location..."},
+		{"<control>n", "Open a new window"},
+		{"Left Up Page_Up", "Previous image"},
+		{"Right Down Page_Down", "Next image"},
+		{"Return <alt>Left", "Return to browser"},
+		{}
+	}},
+	{"Zoom", (struct key[]) {
+		{"<control>0", "Set zoom to 100%"},
+		{"1...9", "Set zoom to N:1"},
+		{"plus <control>plus", "Zoom in"},
+		{"minus <control>minus", "Zoom out"},
+		{"w", "Zoom to fit width if larger"},
+		{"h", "Zoom to fit height if larger"},
+		{}
+	}},
+	{"Orientation", (struct key[]) {
+		{"less", "Rotate anticlockwise"},
+		{"equal", "Mirror"},
+		{"greater", "Rotate clockwise"},
+		{}
+	}},
+	{"Configuration", (struct key[]) {
+		{"x", "Toggle scale to fit if larger"},
+		{"i", "Toggle smooth scaling"},
+		{"t", "Toggle transparency highlighting"},
+		{}
+	}},
+	{"Control", (struct key[]) {
+		{"bracketleft", "Previous page"},
+		{"bracketright", "Next page"},
+		{"braceleft", "Previous frame"},
+		{"braceright", "Next frame"},
+		{"space", "Toggle playback"},
+		{}
+	}},
+	{"Tools", (struct key[]) {
+		{"<control>p", "Print..."},
+		{"<control>s", "Save page as..."},
+		{"<control><shift>s", "Save frame as..."},
+		{"<alt>Return", "Show file information"},
+		{}
+	}},
+	{}
+};
+
 static struct key_section help_keys[] = {
-	{"Browser", "browser", (struct key_group[]) {
-		{"General", help_keys_general},
-		{"View", (struct key[]) {
-			{"F9", "Toggle navigation sidebar"},
-			{}
-		}},
-		{"Navigation", (struct key[]) {
-			{"<control>l", "Open location..."},
-			{"<control>n", "Open a new window"},
-			{"<alt>Left", "Go back in history"},
-			{"<alt>Right", "Go forward in history"},
-			{"<alt>Up", "Go to parent directory"},
-			{"<alt>Home", "Go home"},
-			{"F5 r <control>r", "Refresh"},
-			{}
-		}},
-		{}
-	}},
-	{"View", "view", (struct key_group[]) {
-		{"General", help_keys_general},
-		{"View", (struct key[]) {
-			{"F8", "Toggle toolbar"},
-			{}
-		}},
-		{"Navigation", (struct key[]) {
-			{"<control>l", "Open location..."},
-			{"<control>n", "Open a new window"},
-			{"Left Up Page_Up", "Previous image"},
-			{"Right Down Page_Down", "Next image"},
-			{"Return <alt>Left", "Return to browser"},
-			{}
-		}},
-		{"Zoom", (struct key[]) {
-			{"<control>0", "Set zoom to 100%"},
-			{"1...9", "Set zoom to N:1"},
-			{"plus <control>plus", "Zoom in"},
-			{"minus <control>minus", "Zoom out"},
-			{"w", "Zoom to fit width if larger"},
-			{"h", "Zoom to fit height if larger"},
-			{}
-		}},
-		{"Orientation", (struct key[]) {
-			{"less", "Rotate anticlockwise"},
-			{"equal", "Mirror"},
-			{"greater", "Rotate clockwise"},
-			{}
-		}},
-		{"Configuration", (struct key[]) {
-			{"x", "Toggle scale to fit if larger"},
-			{"i", "Toggle smooth scaling"},
-			{"t", "Toggle transparency highlighting"},
-			{}
-		}},
-		{"Control", (struct key[]) {
-			{"bracketleft", "Previous page"},
-			{"bracketright", "Next page"},
-			{"braceleft", "Previous frame"},
-			{"braceright", "Next frame"},
-			{"space", "Toggle playback"},
-			{}
-		}},
-		{"Tools", (struct key[]) {
-			{"<control>p", "Print..."},
-			{"<control>s", "Save page as..."},
-			{"<control><shift>s", "Save frame as..."},
-			{}
-		}},
-		{}
-	}},
+	{"Browser", "browser", help_keys_browser},
+	{"View", "view", help_keys_view},
 	{}
 };
 
@@ -199,7 +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) \
@@ -230,7 +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")) \
@@ -944,6 +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);
@@ -1088,6 +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);
@@ -1119,6 +1125,43 @@ make_view_toolbar(void)
 	return view_toolbar;
 }
 
+// This is incredibly broken https://stackoverflow.com/a/51054396/76313
+// thus resolving the problem using overlaps.
+// We're trying to be universal for light and dark themes both. It's hard.
+static const char stylesheet[] = "@define-color fiv-tile @content_view_bg; \
+	fiv-view, fiv-browser { background: @content_view_bg; } \
+	placessidebar.fiv .toolbar { padding: 2px 6px; } \
+	placessidebar.fiv box > separator { margin: 4px 0; } \
+	#toolbar button { padding-left: 0; padding-right: 0; } \
+	#toolbar > button:first-child { padding-left: 4px; } \
+	#toolbar > button:last-child { padding-right: 4px; } \
+	#toolbar separator { \
+		background: mix(@insensitive_fg_color, \
+			@insensitive_bg_color, 0.4); margin: 6px 10px; \
+	} \
+	fiv-browser { padding: 5px; } \
+	fiv-browser.item { \
+		color: mix(#000, @content_view_bg, 0.625); margin: 8px; \
+		border: 2px solid #fff; \
+	} \
+	fiv-browser.item, fiv-view.checkerboard { \
+		background: @theme_bg_color; background-image: \
+			linear-gradient(45deg, @fiv-tile 26%, transparent 26%), \
+			linear-gradient(-45deg, @fiv-tile 26%, transparent 26%), \
+			linear-gradient(45deg, transparent 74%, @fiv-tile 74%), \
+			linear-gradient(-45deg, transparent 74%, @fiv-tile 74%); \
+		background-size: 40px 40px; \
+		background-position: 0 0, 0 20px, 20px -20px, -20px 0px; \
+	} \
+	fiv-browser.item:backdrop { \
+		color: mix(#000, @content_view_bg, 0.875); \
+		border-color: mix(#fff, @content_view_bg, 0.5); \
+	} \
+	fiv-browser.item.symbolic { \
+		border-color: transparent; color: shade(@theme_bg_color, 0.875); \
+		background: @theme_bg_color; background-image: none; \
+	}";
+
 int
 main(int argc, char *argv[])
 {
@@ -1165,45 +1208,9 @@ main(int argc, char *argv[])
 	gtk_icon_theme_add_resource_path(
 		gtk_icon_theme_get_default(), "/org/gnome/design/IconLibrary/");
 
-	// This is incredibly broken https://stackoverflow.com/a/51054396/76313
-	// thus resolving the problem using overlaps.
-	// We're trying to be universal for light and dark themes both. It's hard.
-	const char *style = "@define-color fiv-tile @content_view_bg; \
-		fiv-view, fiv-browser { background: @content_view_bg; } \
-		placessidebar.fiv .toolbar { padding: 2px 6px; } \
-		placessidebar.fiv box > separator { margin: 4px 0; } \
-		#toolbar button { padding-left: 0; padding-right: 0; } \
-		#toolbar > button:first-child { padding-left: 4px; } \
-		#toolbar > button:last-child { padding-right: 4px; } \
-		#toolbar separator { \
-			background: mix(@insensitive_fg_color, \
-				@insensitive_bg_color, 0.4); margin: 6px 10px; \
-		} \
-		fiv-browser { padding: 5px; } \
-		fiv-browser.item { \
-			color: mix(#000, @content_view_bg, 0.625); margin: 8px; \
-			border: 2px solid #fff; \
-		} \
-		fiv-browser.item, fiv-view.checkerboard { \
-			background: @theme_bg_color; background-image: \
-				linear-gradient(45deg, @fiv-tile 26%, transparent 26%), \
-				linear-gradient(-45deg, @fiv-tile 26%, transparent 26%), \
-				linear-gradient(45deg, transparent 74%, @fiv-tile 74%), \
-				linear-gradient(-45deg, transparent 74%, @fiv-tile 74%); \
-			background-size: 40px 40px; \
-			background-position: 0 0, 0 20px, 20px -20px, -20px 0px; \
-		} \
-		fiv-browser.item:backdrop { \
-			color: mix(#000, @content_view_bg, 0.875); \
-			border-color: mix(#fff, @content_view_bg, 0.5); \
-		} \
-		fiv-browser.item.symbolic { \
-			border-color: transparent; color: shade(@theme_bg_color, 0.875); \
-			background: @theme_bg_color; background-image: none; \
-		}";
-
 	GtkCssProvider *provider = gtk_css_provider_new();
-	gtk_css_provider_load_from_data(provider, style, strlen(style), NULL);
+	gtk_css_provider_load_from_data(
+		provider, stylesheet, sizeof stylesheet - 1, NULL);
 	gtk_style_context_add_provider_for_screen(gdk_screen_get_default(),
 		GTK_STYLE_PROVIDER(provider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
 	g_object_unref(provider);
@@ -1238,10 +1245,8 @@ main(int argc, char *argv[])
 	gtk_container_set_focus_hadjustment(GTK_CONTAINER(browser_port), NULL);
 	gtk_container_set_focus_vadjustment(GTK_CONTAINER(browser_port), NULL);
 
-	// TODO(p): As with GtkFileChooserWidget, bind:
-	//  - C-h to filtering,
-	//  - M-Up to going a level above,
-	//  - mayhaps forward the rest to the sidebar, somehow.
+	// TODO(p): As with GtkFileChooserWidget, bind C-h to filtering,
+	// and mayhaps forward the rest to the sidebar, somehow.
 	g.browser_sidebar = g_object_new(FIV_TYPE_SIDEBAR, NULL);
 	g_signal_connect(g.browser_sidebar, "open-location",
 		G_CALLBACK(on_open_location), NULL);

fiv-view.c

@@ -786,6 +786,132 @@ save_as(FivView *self, gboolean frame)
 	}
 }
 
+enum { INFO_KEY, INFO_VALUE, INFO_WEIGHT, INFO_COUNT };
+
+static GtkTreeModel *
+info_model(char *tsv)
+{
+	GtkTreeStore *store = gtk_tree_store_new(
+		INFO_COUNT, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_INT, G_TYPE_BOOLEAN);
+	GtkTreeIter category = {}, entry = {};
+	const char *last_group = NULL;
+
+	int line = 1;
+	for (char *nl; (nl = strchr(tsv, '\n')); line++, tsv = ++nl) {
+		*nl = 0;
+		if (nl > tsv && nl[-1] == '\r')
+			nl[-1] = 0;
+
+		char *group = tsv, *tag = strchr(group, '\t');
+		if (!tag) {
+			g_warning("ExifTool parse error on line %d", line);
+			continue;
+		}
+
+		*tag++ = 0;
+		for (char *p = group; *p; p++)
+			if (*p == '_')
+				*p = ' ';
+
+		char *value = strchr(tag, '\t');
+		if (!value) {
+			g_warning("ExifTool parse error on line %d", line);
+			continue;
+		}
+
+		*value++ = 0;
+		if (!last_group || strcmp(last_group, group)) {
+			last_group = group;
+
+			gtk_tree_store_append(store, &category, NULL);
+			gtk_tree_store_set(store, &category, INFO_KEY, group,
+				INFO_WEIGHT, PANGO_WEIGHT_BOLD, -1);
+		}
+
+		gtk_tree_store_append(store, &entry, &category);
+		gtk_tree_store_set(store, &entry, INFO_KEY, tag, INFO_VALUE, value,
+			INFO_WEIGHT, PANGO_WEIGHT_NORMAL, -1);
+	}
+	return GTK_TREE_MODEL(store);
+}
+
+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): Replace this disaster with:
+	// GtkBox -> GtkExpander, GtkBox/GtkGrid -> GtkLabel, GtkSizeGroup.
+	// We'll lose search, but the user will be able to copy text out.
+	GtkWidget *view = gtk_tree_view_new();
+	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(view), -1,
+		"Field", gtk_cell_renderer_text_new(), "text", INFO_KEY,
+		"weight", INFO_WEIGHT, NULL);
+	gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(view), -1,
+		"Value", gtk_cell_renderer_text_new(), "text", INFO_VALUE, NULL);
+
+	GtkTreeModel *model = info_model(out);
+	gtk_tree_view_set_model(GTK_TREE_VIEW(view), model);
+	gtk_tree_view_expand_all(GTK_TREE_VIEW(view));
+	g_object_unref(model);
+
+	// GtkTreeView doesn't have a useful natural height.
+	GtkWidget *scroller = gtk_scrolled_window_new(NULL, NULL);
+	gtk_scrolled_window_set_max_content_width(
+		GTK_SCROLLED_WINDOW(scroller), 800);
+	gtk_scrolled_window_set_propagate_natural_width(
+		GTK_SCROLLED_WINDOW(scroller), TRUE);
+	gtk_window_set_default_size(GTK_WINDOW(dialog), -1, 800);
+
+	gtk_widget_set_hexpand(view, TRUE);
+	gtk_widget_set_vexpand(view, TRUE);
+	gtk_container_add(GTK_CONTAINER(scroller), view);
+	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 +949,12 @@ 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 +1175,8 @@ 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,