fiv/fastiv.c

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2021-07-14 07:09:19 +02:00
//
// fastiv.c: fast image viewer
//
// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
#include <gtk/gtk.h>
#include <glib.h>
#include <glib/gstdio.h>
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#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <locale.h>
#include <fnmatch.h>
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#include "config.h"
#include "fastiv-view.h"
// --- Utilities ---------------------------------------------------------------
static void
exit_fatal(const gchar *format, ...) G_GNUC_PRINTF(1, 2);
static void
exit_fatal(const gchar *format, ...)
{
va_list ap;
va_start(ap, format);
gchar *format_nl = g_strdup_printf("%s\n", format);
vfprintf(stderr, format_nl, ap);
free(format_nl);
va_end(ap);
exit(EXIT_FAILURE);
}
/// Add `element` to the `output` set. `relation` is a map of sets of strings
/// defining is-a relations, and is traversed recursively.
static void
add_applying_transitive_closure(const gchar *element, GHashTable *relation,
GHashTable *output)
{
// Stop condition.
if (!g_hash_table_add(output, g_strdup(element)))
return;
// TODO(p): Iterate over all aliases of `element` in addition to
// any direct match (and rename this no-longer-generic function).
GHashTable *targets = g_hash_table_lookup(relation, element);
if (!targets)
return;
GHashTableIter iter;
g_hash_table_iter_init(&iter, targets);
gpointer key = NULL, value = NULL;
while (g_hash_table_iter_next(&iter, &key, &value))
add_applying_transitive_closure(key, relation, output);
}
// --- XDG ---------------------------------------------------------------------
gchar *
get_xdg_home_dir(const char *var, const char *default_)
{
const char *env = getenv(var);
if (env && *env == '/')
return g_strdup(env);
// The specification doesn't handle a missing HOME variable explicitly.
// Implicitly, assuming Bourne shell semantics, it simply resolves empty.
const char *home = getenv("HOME");
return g_build_filename(home ? home : "", default_, NULL);
}
static gchar **
get_xdg_data_dirs(void)
{
// GStrvBuilder is too new, it would help a little bit.
GPtrArray *output = g_ptr_array_new_with_free_func(g_free);
g_ptr_array_add(output, get_xdg_home_dir("XDG_DATA_HOME", ".local/share"));
const gchar *xdg_data_dirs;
if (!(xdg_data_dirs = getenv("XDG_DATA_DIRS")) || !*xdg_data_dirs)
xdg_data_dirs = "/usr/local/share/:/usr/share/";
gchar **candidates = g_strsplit(xdg_data_dirs, ":", 0);
for (gchar **p = candidates; *p; p++) {
if (**p == '/')
g_ptr_array_add(output, *p);
else
g_free(*p);
}
g_free(candidates);
g_ptr_array_add(output, NULL);
return (gchar **) g_ptr_array_free(output, FALSE);
}
// --- Filtering ---------------------------------------------------------------
// Derived from shared-mime-info-spec 0.21.
// TODO(p): Move to fastiv-io.c, expose the prototype in a header file
// (perhaps finally start a new one for it).
// A subset of shared-mime-info that produces an appropriate list of
// file extensions. Chiefly motivated by the suckiness of RAW images:
// someone else will maintain the list of file extensions for us.
static const char *supported_media_types[] = {
"image/bmp",
"image/gif",
"image/png",
"image/jpeg",
#ifdef HAVE_LIBRAW
"image/x-dcraw",
#endif // HAVE_LIBRAW
};
static void
read_mime_subclasses(const gchar *path, GHashTable *subclass_sets)
{
gchar *data = NULL;
if (!g_file_get_contents(path, &data, NULL /* length */, NULL /* error */))
return;
// The format of this file is unspecified,
// but in practice it's a list of space-separated media types.
gchar *datasave = NULL;
for (gchar *line = strtok_r(data, "\r\n", &datasave); line;
line = strtok_r(NULL, "\r\n", &datasave)) {
gchar *linesave = NULL,
*subclass = strtok_r(line, " ", &linesave),
*superclass = strtok_r(NULL, " ", &linesave);
// Nothing about comments is specified, we're being nice.
if (!subclass || *subclass == '#' || !superclass)
continue;
GHashTable *set = NULL;
if (!(set = g_hash_table_lookup(subclass_sets, superclass))) {
set = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
g_hash_table_insert(subclass_sets, g_strdup(superclass), set);
}
g_hash_table_add(set, g_strdup(subclass));
}
g_free(data);
}
static gboolean
filter_mime_globs(const gchar *path, guint is_globs2, GHashTable *supported_set,
GHashTable *output_set)
{
gchar *data = NULL;
if (!g_file_get_contents(path, &data, NULL /* length */, NULL /* error */))
return FALSE;
gchar *datasave = NULL;
for (const gchar *line = strtok_r(data, "\r\n", &datasave); line;
line = strtok_r(NULL, "\r\n", &datasave)) {
if (*line == '#')
continue;
// We do not support __NOGLOBS__, nor even parse out the "cs" flag.
// The weight is irrelevant.
gchar **f = g_strsplit(line, ":", 0);
if (g_strv_length(f) >= is_globs2 + 2) {
const gchar *type = f[is_globs2 + 0], *glob = f[is_globs2 + 1];
if (g_hash_table_contains(supported_set, type))
g_hash_table_add(output_set, g_utf8_strdown(glob, -1));
}
g_strfreev(f);
}
g_free(data);
return TRUE;
}
static gchar **
get_supported_globs (void)
{
gchar **data_dirs = get_xdg_data_dirs();
// The mime.cache format is inconvenient to parse,
// we'll do it from the text files manually, and once only.
GHashTable *subclass_sets = g_hash_table_new_full(g_str_hash, g_str_equal,
g_free, (GDestroyNotify) g_hash_table_destroy);
for (gsize i = 0; data_dirs[i]; i++) {
gchar *path =
g_build_filename(data_dirs[i], "mime", "subclasses", NULL);
read_mime_subclasses(path, subclass_sets);
g_free(path);
}
// A hash set of all supported media types, including subclasses,
// but not aliases.
GHashTable *supported =
g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
for (gsize i = 0; i < G_N_ELEMENTS(supported_media_types); i++) {
add_applying_transitive_closure(supported_media_types[i],
subclass_sets, supported);
}
g_hash_table_destroy(subclass_sets);
// We do not support the distinction of case-sensitive globs (:cs).
GHashTable *globs =
g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
for (gsize i = 0; data_dirs[i]; i++) {
gchar *path2 = g_build_filename(data_dirs[i], "mime", "globs2", NULL);
gchar *path1 = g_build_filename(data_dirs[i], "mime", "globs", NULL);
if (!filter_mime_globs(path2, TRUE, supported, globs))
filter_mime_globs(path1, FALSE, supported, globs);
g_free(path2);
g_free(path1);
}
g_strfreev(data_dirs);
g_hash_table_destroy(supported);
gchar **result = (gchar **) g_hash_table_get_keys_as_array(globs, NULL);
g_hash_table_steal_all(globs);
g_hash_table_destroy(globs);
return result;
}
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// --- Main --------------------------------------------------------------------
struct {
gchar **supported_globs;
gchar *directory;
GPtrArray *files;
gint files_index;
gchar *basename;
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GtkWidget *window;
GtkWidget *view;
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} g;
static gboolean
is_supported(const gchar *filename)
{
gchar *utf8 = g_filename_to_utf8(filename, -1, NULL, NULL, NULL);
if (!utf8)
return FALSE;
gchar *lowercased = g_utf8_strdown(utf8, -1);
g_free(utf8);
// XXX: fnmatch() uses the /locale/ encoding, but who cares nowadays.
for (gchar **p = g.supported_globs; *p; p++)
if (!fnmatch(*p, lowercased, 0)) {
g_free(lowercased);
return TRUE;
}
g_free(lowercased);
return FALSE;
}
static void
show_error_dialog(GError *error)
{
GtkWidget *dialog = gtk_message_dialog_new(GTK_WINDOW(g.window),
GTK_DIALOG_MODAL,
GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", error->message);
gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(dialog);
g_error_free(error);
}
static void
load_directory(const gchar *dirname)
{
free(g.directory);
g.directory = g_strdup(dirname);
g_ptr_array_set_size(g.files, 0);
g.files_index = -1;
GError *error = NULL;
GDir *dir = g_dir_open(dirname, 0, &error);
if (dir) {
for (const gchar *name = NULL; (name = g_dir_read_name(dir)); ) {
if (!is_supported(name))
continue;
// XXX: We presume that this basename is from the same directory.
if (!g_strcmp0(g.basename, name))
g.files_index = g.files->len;
g_ptr_array_add(g.files, g_strdup(name));
}
g_dir_close(dir);
} else {
show_error_dialog(error);
}
g_ptr_array_add(g.files, NULL);
// XXX: When something outside the filtered entries is open, the index is
// kept at -1, and browsing doesn't work. How to behave here?
// Should we add it to the pointer array as an exception?
}
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static void
open(const gchar *path)
{
g_return_if_fail(g_path_is_absolute(path));
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GError *error = NULL;
if (!fastiv_view_open(FASTIV_VIEW(g.view), path, &error)) {
show_error_dialog(error);
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return;
}
gtk_window_set_title(GTK_WINDOW(g.window), path);
gchar *basename = g_path_get_basename(path);
g_free(g.basename);
g.basename = basename;
// So that load_directory() itself can be used for reloading.
gchar *dirname = g_path_get_dirname(path);
if (!g.directory || strcmp(dirname, g.directory)) {
load_directory(dirname);
} else {
g.files_index = -1;
for (guint i = 0; i + 1 < g.files->len; i++) {
if (!g_strcmp0(g.basename, g_ptr_array_index(g.files, i)))
g.files_index = i;
}
}
g_free(dirname);
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}
static void
on_open(void)
{
// TODO(p): Populate and pass a GtkFileFilter.
// If we want to keep this functionality, that is.
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GtkWidget *dialog = gtk_file_chooser_dialog_new("Open file",
GTK_WINDOW(g.window), GTK_FILE_CHOOSER_ACTION_OPEN,
"_Cancel", GTK_RESPONSE_CANCEL,
"_Open", GTK_RESPONSE_ACCEPT, NULL);
// The default is local-only, single item. Paths are returned absolute.
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if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
gchar *path = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
open(path);
g_free(path);
}
gtk_widget_destroy(dialog);
}
static void
on_previous(void)
{
if (g.files_index >= 0) {
int previous =
(g.files->len - 1 + g.files_index - 1) % (g.files->len - 1);
char *absolute =
g_canonicalize_filename(g_ptr_array_index(g.files, previous),
g.directory);
open(absolute);
g_free(absolute);
}
}
static void
on_next(void)
{
if (g.files_index >= 0) {
int next = (g.files_index + 1) % (g.files->len - 1);
char *absolute =
g_canonicalize_filename(g_ptr_array_index(g.files, next),
g.directory);
open(absolute);
g_free(absolute);
}
}
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int
main(int argc, char *argv[])
{
if (!setlocale(LC_CTYPE, ""))
exit_fatal("cannot set locale");
gboolean show_version = FALSE;
gchar **path_args = NULL;
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const GOptionEntry options[] = {
{G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &path_args,
NULL, "[FILE | DIRECTORY]"},
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{"version", 'V', G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_NONE,
&show_version, "output version information and exit", NULL},
{},
};
GError *error = NULL;
if (!gtk_init_with_args(&argc, &argv, " - fast image viewer",
options, NULL, &error))
exit_fatal("%s", error->message);
if (show_version) {
printf(PROJECT_NAME " " PROJECT_VERSION "\n");
return 0;
}
// NOTE: Firefox and Eye of GNOME both interpret multiple arguments
// in a special way. This is problematic, because one-element lists
// are unrepresentable.
// TODO(p): Complain to the user if there's more than one argument.
// Best show the help message, if we can figure that out.
const gchar *path_arg = path_args ? path_args[0] : NULL;
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gtk_window_set_default_icon_name(PROJECT_NAME);
const char *style = "fastiv-view { background: black; }";
GtkCssProvider *provider = gtk_css_provider_new();
gtk_css_provider_load_from_data(provider, style, strlen(style), NULL);
gtk_style_context_add_provider_for_screen(gdk_screen_get_default(),
GTK_STYLE_PROVIDER(provider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
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g.view = g_object_new(FASTIV_TYPE_VIEW, NULL);
g.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(g.window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
gtk_container_add(GTK_CONTAINER(g.window), g.view);
// The references to closures are initially floating and sunk on connect.
GtkAccelGroup *accel_group = gtk_accel_group_new();
gtk_accel_group_connect(accel_group, GDK_KEY_Escape, 0, 0,
g_cclosure_new(G_CALLBACK(gtk_main_quit), NULL, NULL));
gtk_accel_group_connect(accel_group, GDK_KEY_q, 0, 0,
g_cclosure_new(G_CALLBACK(gtk_main_quit), NULL, NULL));
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gtk_accel_group_connect(accel_group, GDK_KEY_o, 0, 0,
g_cclosure_new(G_CALLBACK(on_open), NULL, NULL));
gtk_accel_group_connect(accel_group, GDK_KEY_o, GDK_CONTROL_MASK, 0,
g_cclosure_new(G_CALLBACK(on_open), NULL, NULL));
// FIXME: The left/right arrows do not work, for whatever reason.
gtk_accel_group_connect(accel_group, GDK_KEY_Left, 0, 0,
g_cclosure_new(G_CALLBACK(on_previous), NULL, NULL));
gtk_accel_group_connect(accel_group, GDK_KEY_Page_Up, 0, 0,
g_cclosure_new(G_CALLBACK(on_previous), NULL, NULL));
gtk_accel_group_connect(accel_group, GDK_KEY_Right, 0, 0,
g_cclosure_new(G_CALLBACK(on_next), NULL, NULL));
gtk_accel_group_connect(accel_group, GDK_KEY_Page_Down, 0, 0,
g_cclosure_new(G_CALLBACK(on_next), NULL, NULL));
gtk_accel_group_connect(accel_group, GDK_KEY_space, 0, 0,
g_cclosure_new(G_CALLBACK(on_next), NULL, NULL));
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gtk_window_add_accel_group(GTK_WINDOW(g.window), accel_group);
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g.supported_globs = get_supported_globs();
g.files = g_ptr_array_new_full(16, g_free);
gchar *cwd = g_get_current_dir();
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// TODO(p): Desired behaviour:
// - No arguments: show directory view of the current working directory.
// - File argument: load its directory for browsing, open the file.
// - Directory argument: load its directory for browsing, show the dir.
GStatBuf st;
if (!path_arg) {
load_directory(cwd);
} else if (g_stat(path_arg, &st)) {
show_error_dialog(g_error_new(G_FILE_ERROR,
g_file_error_from_errno(errno),
"%s: %s", path_arg, g_strerror(errno)));
load_directory(cwd);
} else {
gchar *path_arg_absolute = g_canonicalize_filename(path_arg, cwd);
if (S_ISDIR(st.st_mode))
load_directory(path_arg_absolute);
else
open(path_arg_absolute);
g_free(path_arg_absolute);
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}
g_free(cwd);
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// TODO(p): When no picture is loaded, show a view of this directory
// (we're missing a widget for that).
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gtk_widget_show_all(g.window);
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gtk_main();
return 0;
}