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#include "hotload.h"
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define internal static
#define FSEVENT_CALLBACK(name) void name(ConstFSEventStreamRef stream,\
void *context,\
size_t count,\
void *paths,\
const FSEventStreamEventFlags *flags,\
const FSEventStreamEventId *ids)
internal char *
copy_string(const char *s)
{
unsigned length = strlen(s);
char *result = malloc(length + 1);
memcpy(result, s, length);
result[length] = '\0';
return result;
}
internal char *
file_directory(const char *file)
{
char *last_slash = strrchr(file, '/');
*last_slash = '\0';
char *directory = copy_string(file);
*last_slash = '/';
return directory;
}
internal char *
file_name(const char *file)
{
char *last_slash = strrchr(file, '/');
char *name = copy_string(last_slash + 1);
return name;
}
internal char *
resolve_symlink(char *file)
{
struct stat buffer;
if (lstat(file, &buffer) != 0) {
return NULL;
}
if (!S_ISLNK(buffer.st_mode)) {
return file;
}
ssize_t size = buffer.st_size + 1;
char *result = malloc(size);
ssize_t read = readlink(file, result, size);
if (read != -1) {
result[read] = '\0';
return result;
}
free(result);
return NULL;
}
internal struct watched_file *
hotloader_watched_file(struct hotloader *hotloader, char *absolutepath)
{
struct watched_file *result = NULL;
for (unsigned index = 0; result == NULL && index < hotloader->watch_count; ++index) {
struct watched_file *watch_info = hotloader->watch_list + index;
char *directory = file_directory(absolutepath);
char *filename = file_name(absolutepath);
if (strcmp(watch_info->directory, directory) == 0) {
if (strcmp(watch_info->filename, filename) == 0) {
result = watch_info;
}
}
free(filename);
free(directory);
}
return result;
}
internal FSEVENT_CALLBACK(hotloader_handler)
{
/* NOTE(koekeishiya): We sometimes get two events upon file save. */
struct hotloader *hotloader = (struct hotloader *) context;
char **files = (char **) paths;
struct watched_file *watch_info;
for (unsigned index = 0; index < count; ++index) {
char *absolutepath = files[index];
if ((watch_info = hotloader_watched_file(hotloader, absolutepath))) {
hotloader->callback(absolutepath, watch_info->directory, watch_info->filename);
}
}
}
void hotloader_add_file(struct hotloader *hotloader, char *file)
{
if (!hotloader->enabled) {
char *real_path = resolve_symlink(file);
if (real_path) {
struct watched_file watch_info;
watch_info.directory = file_directory(real_path);
watch_info.filename = file_name(real_path);
if (real_path != file) {
free(real_path);
}
hotloader->watch_list[hotloader->watch_count++] = watch_info;
printf("hotload: watching file '%s' in directory '%s'\n", watch_info.filename, watch_info.directory);
} else {
fprintf(stderr, "hotload: could not watch file '%s'\n", file);
}
}
}
bool hotloader_begin(struct hotloader *hotloader, hotloader_callback *callback)
{
if ((hotloader->enabled) ||
(!hotloader->watch_count)) {
return false;
}
CFStringRef string_refs[hotloader->watch_count];
for (unsigned index = 0; index < hotloader->watch_count; ++index) {
string_refs[index] = CFStringCreateWithCString(kCFAllocatorDefault,
hotloader->watch_list[index].directory,
kCFStringEncodingUTF8);
}
FSEventStreamContext context = {};
context.info = (void *) hotloader;
hotloader->enabled = true;
hotloader->callback = callback;
hotloader->path = (CFArrayRef) CFArrayCreate(NULL, (const void **) string_refs, hotloader->watch_count, &kCFTypeArrayCallBacks);
hotloader->flags = kFSEventStreamCreateFlagNoDefer | kFSEventStreamCreateFlagFileEvents;
hotloader->stream = FSEventStreamCreate(NULL,
hotloader_handler,
&context,
hotloader->path,
kFSEventStreamEventIdSinceNow,
0.5,
hotloader->flags);
FSEventStreamScheduleWithRunLoop(hotloader->stream, CFRunLoopGetMain(), kCFRunLoopDefaultMode);
FSEventStreamStart(hotloader->stream);
return true;
}
void hotloader_end(struct hotloader *hotloader)
{
if (hotloader->enabled) {
FSEventStreamStop(hotloader->stream);
FSEventStreamInvalidate(hotloader->stream);
FSEventStreamRelease(hotloader->stream);
CFIndex count = CFArrayGetCount(hotloader->path);
for (unsigned index = 0; index < count; ++index) {
CFStringRef string_ref = (CFStringRef) CFArrayGetValueAtIndex(hotloader->path, index);
free(hotloader->watch_list[index].directory);
free(hotloader->watch_list[index].filename);
CFRelease(string_ref);
}
CFRelease(hotloader->path);
memset(hotloader, 0, sizeof(struct hotloader));
}
}
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