#19 hotloader should resolve symlinks

2 files changed, 54 insertions, 7 deletions

diff --git a/src/hotload.c b/src/hotload.c
index 8677cc2..4bb0aa0 100644
--- a/src/hotload.c
+++ b/src/hotload.c
@@ -1,4 +1,5 @@
 #include "hotload.h"
+#include <sys/stat.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -40,6 +41,40 @@ file_name(const char *file)
     return name;
 }
 
+internal char *
+resolve_symlink(char *file, bool *is_symlink, bool *success)
+{
+    struct stat buffer;
+    if (lstat(file, &buffer) != 0) {
+        goto fail;
+    }
+
+    if (S_ISLNK(buffer.st_mode)) {
+        ssize_t size = buffer.st_size + 1;
+        char *result = malloc(size);
+        ssize_t read = readlink(file, result, size);
+
+        if (read == -1) {
+            free(result);
+            goto fail;
+        }
+
+        result[read] = '\0';
+        *is_symlink = true;
+        *success = true;
+        return result;
+    } else {
+        *is_symlink = false;
+        *success = true;
+        return file;
+    }
+
+fail:
+    *success = false;
+    return NULL;
+}
+
+
 internal struct watched_file *
 hotloader_watched_file(struct hotloader *hotloader, char *absolutepath)
 {
@@ -78,14 +113,26 @@ internal FSEVENT_CALLBACK(hotloader_handler)
     }
 }
 
-void hotloader_add_file(struct hotloader *hotloader, const char *file)
+void hotloader_add_file(struct hotloader *hotloader, char *file)
 {
     if (!hotloader->enabled) {
-        struct watched_file watch_info;
-        watch_info.directory = file_directory(file);
-        watch_info.filename = file_name(file);
-        hotloader->watch_list[hotloader->watch_count++] = watch_info;
-        printf("hotload: watching file '%s' in directory '%s'\n", watch_info.filename, watch_info.directory);
+        bool is_symlink, success;
+        char *real_path = resolve_symlink(file, &is_symlink, &success);
+
+        if (success) {
+            struct watched_file watch_info;
+            watch_info.directory = file_directory(real_path);
+            watch_info.filename = file_name(real_path);
+
+            if (is_symlink) {
+                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);
+        }
     }
 }
 
diff --git a/src/hotload.h b/src/hotload.h
index 5948a21..ad782fb 100644
--- a/src/hotload.h
+++ b/src/hotload.h
@@ -27,6 +27,6 @@ struct hotloader
 
 bool hotloader_begin(struct hotloader *hotloader, hotloader_callback *callback);
 void hotloader_end(struct hotloader *hotloader);
-void hotloader_add_file(struct hotloader *hotloader, const char *file);
+void hotloader_add_file(struct hotloader *hotloader, char *file);
 
 #endif