1 files changed, 43 insertions, 0 deletions
diff --git a/packages/gitbook-core/src/models/File.js b/packages/gitbook-core/src/models/File.js
new file mode 100644
index 0000000..09dfc1b
--- /dev/null
+++ b/packages/gitbook-core/src/models/File.js
@@ -0,0 +1,43 @@
+const path = require('path');
+const { Record } = require('immutable');
+
+const DEFAULTS = {
+    type:  '',
+    mtime: '',
+    path:  ''
+};
+
+class File extends Record(DEFAULTS) {
+    constructor(file) {
+        if (typeof file === 'string') {
+            file = { path: file };
+        }
+
+        super(file);
+    }
+
+    /**
+     * Return url for a file in a GitBook context.
+     * @param {Context} context
+     * @return {String} url
+     */
+    toURL(context) {
+        const { file } = context.getState();
+
+        return path.relative(
+            path.dirname(file.path),
+            this.path
+        );
+    }
+
+    static is(file) {
+        return (file instanceof File);
+    }
+
+    static create(file) {
+        return file instanceof File ?
+            file : new File(file);
+    }
+}
+
+module.exports = File;