1 files changed, 33 insertions, 0 deletions
diff --git a/lib/gitbook.js b/lib/gitbook.js
new file mode 100644
index 0000000..54513c1
--- /dev/null
+++ b/lib/gitbook.js
@@ -0,0 +1,33 @@
+var semver = require('semver');
+var pkg = require('../package.json');
+
+var VERSION = pkg.version;
+var VERSION_STABLE = VERSION.replace(/\-(\S+)/g, '');
+
+var START_TIME = new Date();
+
+// Verify that this gitbook version satisfies a requirement
+// We can't directly use samver.satisfies since it will break all plugins when gitbook version is a prerelease (beta, alpha)
+function satisfies(condition) {
+    // Test with real version
+    if (semver.satisfies(VERSION, condition)) return true;
+
+    // Test with future stable release
+    return semver.satisfies(VERSION_STABLE, condition);
+}
+
+// Return templating/json context for gitbook itself
+function getContext() {
+    return {
+        gitbook: {
+            version: pkg.version,
+            time: START_TIME
+        }
+    };
+}
+
+module.exports = {
+    version: pkg.version,
+    satisfies: satisfies,
+    getContext: getContext
+};