refactor(HandlebarsGenerator): simplify build function

Unify code duplicated between build and buildOne.

Author: alandefreitas

include/mrdocs/Support/Error.hpp

@@ -606,6 +606,14 @@ namespace detail
 #    define MRDOCS_CHECK_GET_MACRO(_1, _2, NAME, ...) NAME
 #    define MRDOCS_CHECK(...) \
         MRDOCS_CHECK_GET_MACRO(__VA_ARGS__, MRDOCS_CHECK_MSG, MRDOCS_CHECK_VOID)(__VA_ARGS__)
+
+#    define MRDOCS_CHECK_OR(var, expr)                         \
+        if (detail::failed(var)) {                        \
+            return expr;         \
+        }                                                  \
+        void(0)
+
+
 #endif
 
 

src/lib/Gen/hbs/Builder.hpp

@@ -47,13 +47,22 @@ class Builder
     dom::Value createContext(Info const& I);
     dom::Value createContext(OverloadSet const& OS);
 
+    /** Render a Handlebars template from the templates directory.
+     */
     Expected<std::string>
     callTemplate(
         std::string_view name,
         dom::Value const& context);
 
-    Expected<std::string> renderSinglePageHeader();
-    Expected<std::string> renderSinglePageFooter();
+    /** Render the header for a single page.
+     */
+    Expected<std::string>
+    renderSinglePageHeader();
+
+    /** Render the footer for a single page.
+     */
+    Expected<std::string>
+    renderSinglePageFooter();
 
     /** Render the contents for a symbol.
      */

src/lib/Gen/hbs/HandlebarsGenerator.cpp

@@ -43,12 +43,6 @@ createExecutors(
     return group;
 }
 
-//------------------------------------------------
-//
-// HandlebarsGenerator
-//
-//------------------------------------------------
-
 /** Return loaded Options from a configuration.
 */
 Options
@@ -79,6 +73,27 @@ loadOptions(
     return opt;
 }
 
+HandlebarsCorpus
+createDomCorpus(
+    HandlebarsGenerator const& gen,
+    Corpus const& corpus)
+{
+    auto options = loadOptions(gen.fileExtension(), corpus.config);
+    return {
+        corpus,
+        std::move(options),
+        gen.fileExtension(),
+        [&gen](HandlebarsCorpus const& c, doc::Node const& n) {
+            return gen.toString(c, n);
+        }};
+}
+
+//------------------------------------------------
+//
+// HandlebarsGenerator
+//
+//------------------------------------------------
+
 Error
 HandlebarsGenerator::
 build(
@@ -90,28 +105,18 @@ build(
         return Generator::build(outputPath, corpus);
     }
 
-    Options options = loadOptions(fileExtension(), corpus.config);
-    HandlebarsCorpus domCorpus(
-        corpus,
-        std::move(options),
-        fileExtension(),
-        [this](HandlebarsCorpus const& c, doc::Node const& n) {
-            return this->toString(c, n);
-        });
+    // Create corpus and executors
+    HandlebarsCorpus domCorpus = createDomCorpus(*this, corpus);
     auto ex = createExecutors(domCorpus);
-    if (!ex)
-    {
-        return ex.error();
-    }
+    MRDOCS_CHECK_OR(ex, ex.error());
 
+    // Visit the corpus
     MultiPageVisitor visitor(*ex, outputPath, corpus);
     visitor(corpus.globalNamespace());
 
+    // Wait for all executors to finish and check errors
     auto errors = ex->wait();
-    if (!errors.empty())
-    {
-        return Error(errors);
-    }
+    MRDOCS_CHECK_OR(errors.empty(), errors);
     return Error::success();
 }
 
@@ -121,47 +126,35 @@ buildOne(
     std::ostream& os,
     Corpus const& corpus) const
 {
-    auto options = loadOptions(fileExtension(), corpus.config);
-
-    HandlebarsCorpus domCorpus(
-        corpus,
-        std::move(options),
-        fileExtension(),
-        [this](HandlebarsCorpus const& c, doc::Node const& n) {
-            return this->toString(c, n);
-        });
+    // Create corpus and executors
+    HandlebarsCorpus domCorpus = createDomCorpus(*this, corpus);
     auto ex = createExecutors(domCorpus);
-    if (!ex)
-    {
-        return ex.error();
-    }
+    MRDOCS_CHECK_OR(ex, ex.error());
 
+    // Render the header
     std::vector<Error> errors;
-    ex->async(
-        [&os](Builder& builder)
-        {
-            auto pageText = builder.renderSinglePageHeader().value();
-            os.write(pageText.data(), pageText.size());
-        });
+    ex->async([&os](Builder& builder) {
+        auto pageText = builder.renderSinglePageHeader().value();
+        os.write(pageText.data(), pageText.size());
+    });
     errors = ex->wait();
-    if(! errors.empty())
-        return {errors};
+    MRDOCS_CHECK_OR(errors.empty(), {errors});
 
+    // Visit the corpus
     SinglePageVisitor visitor(*ex, corpus, os);
     visitor(corpus.globalNamespace());
+
+    // Wait for all executors to finish and check errors
     errors = ex->wait();
-    if(! errors.empty())
-        return {errors};
+    MRDOCS_CHECK_OR(errors.empty(), errors);
 
-    ex->async(
-        [&os](Builder& builder)
-        {
-            auto pageText = builder.renderSinglePageFooter().value();
-            os.write(pageText.data(), pageText.size());
-        });
+    // Render the footer
+    ex->async([&os](Builder& builder) {
+        auto pageText = builder.renderSinglePageFooter().value();
+        os.write(pageText.data(), pageText.size());
+    });
     errors = ex->wait();
-    if(! errors.empty())
-        return {errors};
+    MRDOCS_CHECK_OR(errors.empty(), {errors});
 
     return Error::success();
 }