Split out xdg.{c,h}

This commit is contained in:
Přemysl Eric Janouch 2021-11-01 05:08:55 +01:00
parent 6eecee6b91
commit c8df325c70
Signed by: p
GPG Key ID: A0420B94F92B9493
5 changed files with 210 additions and 175 deletions

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@ -37,6 +37,8 @@
#define WUFFS_CONFIG__MODULE__ZLIB #define WUFFS_CONFIG__MODULE__ZLIB
#include "wuffs-mirror-release-c/release/c/wuffs-v0.3.c" #include "wuffs-mirror-release-c/release/c/wuffs-v0.3.c"
#include "xdg.h"
// A subset of shared-mime-info that produces an appropriate list of // A subset of shared-mime-info that produces an appropriate list of
// file extensions. Chiefly motivated by the suckiness of RAW images: // file extensions. Chiefly motivated by the suckiness of RAW images:
// someone else will maintain the list of file extensions for us. // someone else will maintain the list of file extensions for us.
@ -448,9 +450,6 @@ fastiv_io_open(const gchar *path, GError **error)
#include <glib/gstdio.h> #include <glib/gstdio.h>
#include <png.h> #include <png.h>
// TODO(p): Reorganize the sources.
gchar *get_xdg_home_dir(const char *var, const char *default_);
static void static void
redirect_png_error(png_structp pngp, const char *error) redirect_png_error(png_structp pngp, const char *error)
{ {

173
fastiv.c
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@ -30,6 +30,7 @@
#include "fastiv-browser.h" #include "fastiv-browser.h"
#include "fastiv-io.h" #include "fastiv-io.h"
#include "fastiv-view.h" #include "fastiv-view.h"
#include "xdg.h"
// --- Utilities --------------------------------------------------------------- // --- Utilities ---------------------------------------------------------------
@ -49,176 +50,6 @@ exit_fatal(const gchar *format, ...)
exit(EXIT_FAILURE); 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.
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(const char **media_types)
{
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);
while (*media_types) {
add_applying_transitive_closure(
*media_types++, 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;
}
// --- Main -------------------------------------------------------------------- // --- Main --------------------------------------------------------------------
struct { struct {
@ -478,7 +309,7 @@ main(int argc, char *argv[])
g_cclosure_new(G_CALLBACK(on_next), NULL, NULL)); g_cclosure_new(G_CALLBACK(on_next), NULL, NULL));
gtk_window_add_accel_group(GTK_WINDOW(g.window), accel_group); gtk_window_add_accel_group(GTK_WINDOW(g.window), accel_group);
g.supported_globs = get_supported_globs(fastiv_io_supported_media_types); g.supported_globs = extract_mime_globs(fastiv_io_supported_media_types);
g.files = g_ptr_array_new_full(16, g_free); g.files = g_ptr_array_new_full(16, g_free);
gchar *cwd = g_get_current_dir(); gchar *cwd = g_get_current_dir();

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@ -20,7 +20,7 @@ configure_file(
) )
executable('fastiv', 'fastiv.c', 'fastiv-view.c', 'fastiv-io.c', executable('fastiv', 'fastiv.c', 'fastiv-view.c', 'fastiv-io.c',
'fastiv-browser.c', 'fastiv-browser.c', 'xdg.c',
install : true, install : true,
dependencies : [dependencies]) dependencies : [dependencies])

186
xdg.c Normal file
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@ -0,0 +1,186 @@
//
// xdg.c: various *nix desktop utilities
//
// 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 <glib.h>
/// 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);
}
char *
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.
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;
}
char **
extract_mime_globs(const char **media_types)
{
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);
while (*media_types) {
add_applying_transitive_closure(
*media_types++, 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;
}

19
xdg.h Normal file
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@ -0,0 +1,19 @@
//
// xdg.h: various *nix desktop utilities
//
// 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.
//
char *get_xdg_home_dir(const char *var, const char *default_);
char **extract_mime_globs(const char **media_types);