fiv/fiv-io-model.c

736 lines
20 KiB
C

//
// fiv-io-model.c: filesystem
//
// Copyright (c) 2021 - 2023, 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 "fiv-io.h"
#include "fiv-io-model.h"
#include "xdg.h"
GType
fiv_io_model_sort_get_type(void)
{
static gsize guard;
if (g_once_init_enter(&guard)) {
#define XX(name) {FIV_IO_MODEL_SORT_ ## name, \
"FIV_IO_MODEL_SORT_" #name, #name},
static const GEnumValue values[] = {FIV_IO_MODEL_SORTS(XX) {}};
#undef XX
GType type = g_enum_register_static(
g_intern_static_string("FivIoModelSort"), values);
g_once_init_leave(&guard, type);
}
return guard;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
G_DEFINE_BOXED_TYPE(FivIoModelEntry, fiv_io_model_entry,
fiv_io_model_entry_ref, fiv_io_model_entry_unref)
FivIoModelEntry *
fiv_io_model_entry_ref(FivIoModelEntry *self)
{
return g_rc_box_acquire(self);
}
void
fiv_io_model_entry_unref(FivIoModelEntry *self)
{
g_rc_box_release(self);
}
static size_t
entry_strsize(const char *string)
{
if (!string)
return 0;
return strlen(string) + 1;
}
static char *
entry_strappend(char **p, const char *string, size_t size)
{
if (!string)
return NULL;
char *destination = memcpy(*p, string, size);
*p += size;
return destination;
}
// See model_load_attributes for a (superset of a) list of required attributes.
static FivIoModelEntry *
entry_new(GFile *file, GFileInfo *info)
{
gchar *uri = g_file_get_uri(file);
const gchar *target_uri = g_file_info_get_attribute_string(
info, G_FILE_ATTRIBUTE_STANDARD_TARGET_URI);
const gchar *display_name = g_file_info_get_display_name(info);
// TODO(p): Make it possible to use g_utf8_collate_key() instead,
// which does not use natural sorting.
gchar *parse_name = g_file_get_parse_name(file);
gchar *collate_key = g_utf8_collate_key_for_filename(parse_name, -1);
g_free(parse_name);
// The entries are immutable. Packing them into the structure
// should help memory usage as well as performance.
size_t size_uri = entry_strsize(uri);
size_t size_target_uri = entry_strsize(target_uri);
size_t size_display_name = entry_strsize(display_name);
size_t size_collate_key = entry_strsize(collate_key);
FivIoModelEntry *entry = g_rc_box_alloc0(sizeof *entry +
size_uri +
size_target_uri +
size_display_name +
size_collate_key);
gchar *p = (gchar *) entry + sizeof *entry;
entry->uri = entry_strappend(&p, uri, size_uri);
entry->target_uri = entry_strappend(&p, target_uri, size_target_uri);
entry->display_name = entry_strappend(&p, display_name, size_display_name);
entry->collate_key = entry_strappend(&p, collate_key, size_collate_key);
entry->filesize = (guint64) g_file_info_get_size(info);
GDateTime *mtime = g_file_info_get_modification_date_time(info);
if (mtime) {
entry->mtime_msec = g_date_time_to_unix(mtime) * 1000 +
g_date_time_get_microsecond(mtime) / 1000;
g_date_time_unref(mtime);
}
g_free(uri);
g_free(collate_key);
return entry;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct _FivIoModel {
GObject parent_instance;
GPatternSpec **supported_patterns;
GFile *directory; ///< Currently loaded directory
GFileMonitor *monitor; ///< "directory" monitoring
GPtrArray *subdirs; ///< "directory" contents
GPtrArray *files; ///< "directory" contents
FivIoModelSort sort_field; ///< How to sort
gboolean sort_descending; ///< Whether to sort in reverse
gboolean filtering; ///< Only show non-hidden, supported
};
G_DEFINE_TYPE(FivIoModel, fiv_io_model, G_TYPE_OBJECT)
enum {
PROP_FILTERING = 1,
PROP_SORT_FIELD,
PROP_SORT_DESCENDING,
N_PROPERTIES
};
static GParamSpec *model_properties[N_PROPERTIES];
enum {
RELOADED,
FILES_CHANGED,
SUBDIRECTORIES_CHANGED,
LAST_SIGNAL,
};
// Globals are, sadly, the canonical way of storing signal numbers.
static guint model_signals[LAST_SIGNAL];
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static GPtrArray *
model_entry_array_new(void)
{
return g_ptr_array_new_with_free_func(
(GDestroyNotify) fiv_io_model_entry_unref);
}
static gboolean
model_supports(FivIoModel *self, const char *filename)
{
gchar *utf8 = g_filename_to_utf8(filename, -1, NULL, NULL, NULL);
if (!utf8)
return FALSE;
gchar *lc = g_utf8_strdown(utf8, -1);
gsize lc_length = strlen(lc);
gchar *reversed = g_utf8_strreverse(lc, lc_length);
g_free(utf8);
// fnmatch() uses the /locale encoding/, and isn't present on Windows.
// TODO(p): Consider using g_file_info_get_display_name() for direct UTF-8.
gboolean result = FALSE;
for (GPatternSpec **p = self->supported_patterns; *p; p++)
if ((result = g_pattern_spec_match(*p, lc_length, lc, reversed)))
break;
g_free(lc);
g_free(reversed);
return result;
}
static inline int
model_compare_entries(FivIoModel *self,
const FivIoModelEntry *entry1, GFile *file1,
const FivIoModelEntry *entry2, GFile *file2)
{
if (g_file_has_prefix(file1, file2))
return +1;
if (g_file_has_prefix(file2, file1))
return -1;
int result = 0;
switch (self->sort_field) {
case FIV_IO_MODEL_SORT_MTIME:
result -= entry1->mtime_msec < entry2->mtime_msec;
result += entry1->mtime_msec > entry2->mtime_msec;
if (result != 0)
break;
// Fall-through
case FIV_IO_MODEL_SORT_NAME:
case FIV_IO_MODEL_SORT_COUNT:
result = strcmp(entry1->collate_key, entry2->collate_key);
}
return self->sort_descending ? -result : +result;
}
static gint
model_compare(gconstpointer a, gconstpointer b, gpointer user_data)
{
const FivIoModelEntry *entry1 = *(const FivIoModelEntry **) a;
const FivIoModelEntry *entry2 = *(const FivIoModelEntry **) b;
GFile *file1 = g_file_new_for_uri(entry1->uri);
GFile *file2 = g_file_new_for_uri(entry2->uri);
int result = model_compare_entries(user_data, entry1, file1, entry2, file2);
g_object_unref(file1);
g_object_unref(file2);
return result;
}
static const char *model_load_attributes =
G_FILE_ATTRIBUTE_STANDARD_TYPE ","
G_FILE_ATTRIBUTE_STANDARD_NAME ","
G_FILE_ATTRIBUTE_STANDARD_SIZE ","
G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME ","
G_FILE_ATTRIBUTE_STANDARD_TARGET_URI ","
G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN ","
G_FILE_ATTRIBUTE_TIME_MODIFIED ","
G_FILE_ATTRIBUTE_TIME_MODIFIED_USEC;
static GPtrArray *
model_decide_placement(
FivIoModel *self, GFileInfo *info, GPtrArray *subdirs, GPtrArray *files)
{
if (self->filtering && g_file_info_get_is_hidden(info))
return NULL;
if (g_file_info_get_file_type(info) == G_FILE_TYPE_DIRECTORY)
return subdirs;
if (!self->filtering ||
model_supports(self, g_file_info_get_name(info)))
return files;
return NULL;
}
static gboolean
model_reload_to(FivIoModel *self, GFile *directory,
GPtrArray *subdirs, GPtrArray *files, GError **error)
{
if (subdirs)
g_ptr_array_set_size(subdirs, 0);
if (files)
g_ptr_array_set_size(files, 0);
GFileEnumerator *enumerator = g_file_enumerate_children(
directory, model_load_attributes, G_FILE_QUERY_INFO_NONE, NULL, error);
if (!enumerator)
return FALSE;
GFileInfo *info = NULL;
GFile *child = NULL;
GError *e = NULL;
while (TRUE) {
if (!g_file_enumerator_iterate(enumerator, &info, &child, NULL, &e) &&
e) {
g_warning("%s", e->message);
g_clear_error(&e);
continue;
}
if (!info)
break;
GPtrArray *target =
model_decide_placement(self, info, subdirs, files);
if (target)
g_ptr_array_add(target, entry_new(child, info));
}
g_object_unref(enumerator);
if (subdirs)
g_ptr_array_sort_with_data(subdirs, model_compare, self);
if (files)
g_ptr_array_sort_with_data(files, model_compare, self);
return TRUE;
}
static gboolean
model_reload(FivIoModel *self, GError **error)
{
// Note that this will clear all entries on failure.
gboolean result = model_reload_to(
self, self->directory, self->subdirs, self->files, error);
g_signal_emit(self, model_signals[RELOADED], 0);
return result;
}
static void
model_resort(FivIoModel *self)
{
g_ptr_array_sort_with_data(self->subdirs, model_compare, self);
g_ptr_array_sort_with_data(self->files, model_compare, self);
g_signal_emit(self, model_signals[RELOADED], 0);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static gint
model_find(const GPtrArray *target, GFile *file, FivIoModelEntry **entry)
{
for (guint i = 0; i < target->len; i++) {
FivIoModelEntry *e = target->pdata[i];
GFile *f = g_file_new_for_uri(e->uri);
gboolean match = g_file_equal(f, file);
g_object_unref(f);
if (match) {
*entry = e;
return i;
}
}
return -1;
}
enum monitor_event {
MONITOR_NONE,
MONITOR_CHANGING,
MONITOR_RENAMING,
MONITOR_REMOVING,
MONITOR_ADDING
};
static void
monitor_apply(enum monitor_event event, GPtrArray *target, int index,
FivIoModelEntry *new_entry)
{
// The file used to be filtered out but isn't anymore.
// TODO(p): Handle the inverse transition as well.
if (event == MONITOR_RENAMING && index < 0)
event = MONITOR_ADDING;
if (event == MONITOR_CHANGING) {
g_assert(new_entry != NULL);
fiv_io_model_entry_unref(target->pdata[index]);
target->pdata[index] = fiv_io_model_entry_ref(new_entry);
}
if (event == MONITOR_REMOVING || event == MONITOR_RENAMING)
g_ptr_array_remove_index(target, index);
if (event == MONITOR_RENAMING || event == MONITOR_ADDING) {
g_assert(new_entry != NULL);
g_ptr_array_add(target, fiv_io_model_entry_ref(new_entry));
}
}
static void
on_monitor_changed(G_GNUC_UNUSED GFileMonitor *monitor, GFile *file,
GFile *other_file, GFileMonitorEvent event_type, gpointer user_data)
{
FivIoModel *self = user_data;
FivIoModelEntry *old_entry = NULL;
gint files_index = model_find(self->files, file, &old_entry);
gint subdirs_index = model_find(self->subdirs, file, &old_entry);
enum monitor_event action = MONITOR_NONE;
GFile *new_entry_file = NULL;
switch (event_type) {
case G_FILE_MONITOR_EVENT_CHANGED:
case G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED:
action = MONITOR_CHANGING;
new_entry_file = file;
break;
case G_FILE_MONITOR_EVENT_RENAMED:
action = MONITOR_RENAMING;
new_entry_file = other_file;
break;
case G_FILE_MONITOR_EVENT_DELETED:
case G_FILE_MONITOR_EVENT_MOVED_OUT:
action = MONITOR_REMOVING;
break;
case G_FILE_MONITOR_EVENT_CREATED:
case G_FILE_MONITOR_EVENT_MOVED_IN:
action = MONITOR_ADDING;
old_entry = NULL;
new_entry_file = file;
break;
case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
// TODO(p): Figure out if we can't make use of _CHANGES_DONE_HINT.
case G_FILE_MONITOR_EVENT_PRE_UNMOUNT:
case G_FILE_MONITOR_EVENT_UNMOUNTED:
// TODO(p): Figure out how to handle _UNMOUNTED sensibly.
case G_FILE_MONITOR_EVENT_MOVED:
return;
}
FivIoModelEntry *new_entry = NULL;
GPtrArray *new_target = NULL;
if (new_entry_file) {
GError *error = NULL;
GFileInfo *info = g_file_query_info(new_entry_file,
model_load_attributes, G_FILE_QUERY_INFO_NONE, NULL, &error);
if (error) {
g_debug("monitor: %s", error->message);
g_error_free(error);
goto run;
}
if ((new_target =
model_decide_placement(self, info, self->subdirs, self->files)))
new_entry = entry_new(new_entry_file, info);
g_object_unref(info);
if ((files_index != -1 && new_target == self->subdirs) ||
(subdirs_index != -1 && new_target == self->files)) {
g_debug("monitor: ignoring transfer between files and subdirs");
goto out;
}
}
run:
// Keep a reference alive so that signal handlers see the new arrays.
if (old_entry)
fiv_io_model_entry_ref(old_entry);
if (files_index != -1 || new_target == self->files) {
monitor_apply(action, self->files, files_index, new_entry);
g_signal_emit(self, model_signals[FILES_CHANGED],
0, old_entry, new_entry);
}
if (subdirs_index != -1 || new_target == self->subdirs) {
monitor_apply(action, self->subdirs, subdirs_index, new_entry);
g_signal_emit(self, model_signals[SUBDIRECTORIES_CHANGED],
0, old_entry, new_entry);
}
// NOTE: It would make sense to do
// g_ptr_array_sort_with_data(self->{files,subdirs}, model_compare, self);
// but then the iteration behaviour of fiv.c would differ from what's shown
// in the browser. Perhaps we need to use an index-based, fully-synchronized
// interface similar to GListModel::items-changed.
if (old_entry)
fiv_io_model_entry_unref(old_entry);
out:
if (new_entry)
fiv_io_model_entry_unref(new_entry);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// This would be more efficient iteratively, but it's not that important.
static GFile *
model_last_deep_subdirectory(FivIoModel *self, GFile *directory)
{
GFile *result = NULL;
GPtrArray *subdirs = model_entry_array_new();
if (!model_reload_to(self, directory, subdirs, NULL, NULL))
goto out;
if (subdirs->len) {
FivIoModelEntry *entry = g_ptr_array_index(subdirs, subdirs->len - 1);
GFile *last = g_file_new_for_uri(entry->uri);
result = model_last_deep_subdirectory(self, last);
g_object_unref(last);
} else {
result = g_object_ref(directory);
}
out:
g_ptr_array_free(subdirs, TRUE);
return result;
}
GFile *
fiv_io_model_get_previous_directory(FivIoModel *self)
{
g_return_val_if_fail(FIV_IS_IO_MODEL(self), NULL);
GFile *parent_directory = g_file_get_parent(self->directory);
if (!parent_directory)
return NULL;
GFile *result = NULL;
GPtrArray *subdirs = model_entry_array_new();
if (!model_reload_to(self, parent_directory, subdirs, NULL, NULL))
goto out;
for (gsize i = 0; i < subdirs->len; i++) {
FivIoModelEntry *entry = g_ptr_array_index(subdirs, i);
GFile *file = g_file_new_for_uri(entry->uri);
if (g_file_equal(file, self->directory)) {
g_object_unref(file);
break;
}
g_clear_object(&result);
result = file;
}
if (result) {
GFile *last = model_last_deep_subdirectory(self, result);
g_object_unref(result);
result = last;
} else {
result = g_object_ref(parent_directory);
}
out:
g_object_unref(parent_directory);
g_ptr_array_free(subdirs, TRUE);
return result;
}
// This would be more efficient iteratively, but it's not that important.
static GFile *
model_next_directory_within_parents(FivIoModel *self, GFile *directory)
{
GFile *parent_directory = g_file_get_parent(directory);
if (!parent_directory)
return NULL;
GFile *result = NULL;
GPtrArray *subdirs = model_entry_array_new();
if (!model_reload_to(self, parent_directory, subdirs, NULL, NULL))
goto out;
gboolean found_self = FALSE;
for (gsize i = 0; i < subdirs->len; i++) {
FivIoModelEntry *entry = g_ptr_array_index(subdirs, i);
result = g_file_new_for_uri(entry->uri);
if (found_self)
goto out;
found_self = g_file_equal(result, directory);
g_clear_object(&result);
}
if (!result)
result = model_next_directory_within_parents(self, parent_directory);
out:
g_object_unref(parent_directory);
g_ptr_array_free(subdirs, TRUE);
return result;
}
GFile *
fiv_io_model_get_next_directory(FivIoModel *self)
{
g_return_val_if_fail(FIV_IS_IO_MODEL(self), NULL);
if (self->subdirs->len) {
FivIoModelEntry *entry = g_ptr_array_index(self->subdirs, 0);
return g_file_new_for_uri(entry->uri);
}
return model_next_directory_within_parents(self, self->directory);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
fiv_io_model_finalize(GObject *gobject)
{
FivIoModel *self = FIV_IO_MODEL(gobject);
for (GPatternSpec **p = self->supported_patterns; *p; p++)
g_pattern_spec_free(*p);
g_free(self->supported_patterns);
g_clear_object(&self->directory);
g_clear_object(&self->monitor);
g_ptr_array_free(self->subdirs, TRUE);
g_ptr_array_free(self->files, TRUE);
G_OBJECT_CLASS(fiv_io_model_parent_class)->finalize(gobject);
}
static void
fiv_io_model_get_property(
GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
{
FivIoModel *self = FIV_IO_MODEL(object);
switch (property_id) {
case PROP_FILTERING:
g_value_set_boolean(value, self->filtering);
break;
case PROP_SORT_FIELD:
g_value_set_enum(value, self->sort_field);
break;
case PROP_SORT_DESCENDING:
g_value_set_boolean(value, self->sort_descending);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
}
}
static void
fiv_io_model_set_property(
GObject *object, guint property_id, const GValue *value, GParamSpec *pspec)
{
FivIoModel *self = FIV_IO_MODEL(object);
switch (property_id) {
case PROP_FILTERING:
if (self->filtering != g_value_get_boolean(value)) {
self->filtering = !self->filtering;
g_object_notify_by_pspec(object, model_properties[property_id]);
(void) model_reload(self, NULL /* error */);
}
break;
case PROP_SORT_FIELD:
if ((int) self->sort_field != g_value_get_enum(value)) {
self->sort_field = g_value_get_enum(value);
g_object_notify_by_pspec(object, model_properties[property_id]);
model_resort(self);
}
break;
case PROP_SORT_DESCENDING:
if (self->sort_descending != g_value_get_boolean(value)) {
self->sort_descending = !self->sort_descending;
g_object_notify_by_pspec(object, model_properties[property_id]);
model_resort(self);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
}
}
static void
fiv_io_model_class_init(FivIoModelClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
object_class->get_property = fiv_io_model_get_property;
object_class->set_property = fiv_io_model_set_property;
object_class->finalize = fiv_io_model_finalize;
model_properties[PROP_FILTERING] = g_param_spec_boolean(
"filtering", "Filtering", "Only show non-hidden, supported entries",
TRUE, G_PARAM_READWRITE);
model_properties[PROP_SORT_FIELD] = g_param_spec_enum(
"sort-field", "Sort field", "Sort order",
FIV_TYPE_IO_MODEL_SORT, FIV_IO_MODEL_SORT_NAME, G_PARAM_READWRITE);
model_properties[PROP_SORT_DESCENDING] = g_param_spec_boolean(
"sort-descending", "Sort descending", "Use reverse sort order",
FALSE, G_PARAM_READWRITE);
g_object_class_install_properties(
object_class, N_PROPERTIES, model_properties);
// All entries might have changed.
model_signals[RELOADED] =
g_signal_new("reloaded", G_TYPE_FROM_CLASS(klass), 0, 0,
NULL, NULL, NULL, G_TYPE_NONE, 0);
model_signals[FILES_CHANGED] =
g_signal_new("files-changed", G_TYPE_FROM_CLASS(klass), 0, 0,
NULL, NULL, NULL,
G_TYPE_NONE, 2, FIV_TYPE_IO_MODEL_ENTRY, FIV_TYPE_IO_MODEL_ENTRY);
model_signals[SUBDIRECTORIES_CHANGED] =
g_signal_new("subdirectories-changed", G_TYPE_FROM_CLASS(klass), 0, 0,
NULL, NULL, NULL,
G_TYPE_NONE, 2, FIV_TYPE_IO_MODEL_ENTRY, FIV_TYPE_IO_MODEL_ENTRY);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
fiv_io_model_init(FivIoModel *self)
{
self->filtering = TRUE;
char **types = fiv_io_all_supported_media_types();
char **globs = extract_mime_globs((const char **) types);
g_strfreev(types);
gsize n = g_strv_length(globs);
self->supported_patterns =
g_malloc0_n(n + 1, sizeof *self->supported_patterns);
while (n--)
self->supported_patterns[n] = g_pattern_spec_new(globs[n]);
g_strfreev(globs);
self->files = model_entry_array_new();
self->subdirs = model_entry_array_new();
}
gboolean
fiv_io_model_open(FivIoModel *self, GFile *directory, GError **error)
{
g_return_val_if_fail(FIV_IS_IO_MODEL(self), FALSE);
g_return_val_if_fail(G_IS_FILE(directory), FALSE);
g_clear_object(&self->directory);
g_clear_object(&self->monitor);
self->directory = g_object_ref(directory);
GError *e = NULL;
if ((self->monitor = g_file_monitor_directory(
directory, G_FILE_MONITOR_WATCH_MOVES, NULL, &e))) {
g_signal_connect(self->monitor, "changed",
G_CALLBACK(on_monitor_changed), self);
} else {
g_debug("directory monitoring failed: %s", e->message);
g_error_free(e);
}
return model_reload(self, error);
}
GFile *
fiv_io_model_get_location(FivIoModel *self)
{
g_return_val_if_fail(FIV_IS_IO_MODEL(self), NULL);
return self->directory;
}
FivIoModelEntry *const *
fiv_io_model_get_files(FivIoModel *self, gsize *len)
{
*len = self->files->len;
return (FivIoModelEntry *const *) self->files->pdata;
}
FivIoModelEntry *const *
fiv_io_model_get_subdirs(FivIoModel *self, gsize *len)
{
*len = self->subdirs->len;
return (FivIoModelEntry *const *) self->subdirs->pdata;
}