1 files changed, 57 insertions, 0 deletions
diff --git a/lib/plugins/compatibility.js b/lib/plugins/compatibility.js
new file mode 100644
index 0000000..7ad35a9
--- /dev/null
+++ b/lib/plugins/compatibility.js
@@ -0,0 +1,57 @@
+var _ = require('lodash');
+var error = require('../utils/error');
+
+/*
+    Return the context for a plugin.
+    It tries to keep compatibilities with GitBook v2
+*/
+function pluginCtx(plugin) {
+    var book = plugin.book;
+    var ctx = {
+        config: book.config,
+        log: plugin.log,
+
+        // Paths
+        resolve: book.resolve
+    };
+
+    // Deprecation
+    error.deprecateField(ctx, 'options', book.config.dump(), '"options" property is deprecated, use config.get(key) instead');
+
+    // Loop for template filters/blocks
+    error.deprecateField(ctx, 'book', ctx, '"book" property is deprecated, use "this" directly instead');
+
+    return ctx;
+}
+
+// Call a function "fn" with a context of page similar to the one in GitBook v2
+function pageHook(page, fn) {
+    var ctx = {
+        type: page.type,
+        content: page.content,
+        path: page.path,
+        rawPath: page.rawPath
+    };
+
+    // Deprecate sections
+    error.deprecateField(ctx, 'sections', [
+        { content: ctx.content }
+    ], '"sections" property is deprecated, use page.content instead');
+
+    return fn(ctx)
+    .then(function(result) {
+        if (!result) return undefined;
+        if (result.content) {
+            return result.content;
+        }
+
+        if (result.sections) {
+            return _.pluck(result.sections, 'content').join('\n');
+        }
+    });
+}
+
+module.exports = {
+    pluginCtx: pluginCtx,
+    pageHook: pageHook
+};