1 files changed, 222 insertions, 0 deletions
diff --git a/tools/conventional-changelog-tf-a/index.js b/tools/conventional-changelog-tf-a/index.js
new file mode 100644
index 0000000..2a9d5b4
--- /dev/null
+++ b/tools/conventional-changelog-tf-a/index.js
@@ -0,0 +1,222 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* eslint-env es6 */
+
+"use strict";
+
+const Handlebars = require("handlebars");
+const Q = require("q");
+const _ = require("lodash");
+
+const ccConventionalChangelog = require("conventional-changelog-conventionalcommits/conventional-changelog");
+const ccParserOpts = require("conventional-changelog-conventionalcommits/parser-opts");
+const ccRecommendedBumpOpts = require("conventional-changelog-conventionalcommits/conventional-recommended-bump");
+const ccWriterOpts = require("conventional-changelog-conventionalcommits/writer-opts");
+
+const execa = require("execa");
+
+const readFileSync = require("fs").readFileSync;
+const resolve = require("path").resolve;
+
+/*
+ * Register a Handlebars helper that lets us generate Markdown lists that can support multi-line
+ * strings. This is driven by inconsistent formatting of breaking changes, which may be multiple
+ * lines long and can terminate the list early unintentionally.
+ */
+Handlebars.registerHelper("tf-a-mdlist", function (indent, options) {
+    const spaces = new Array(indent + 1).join(" ");
+    const first = spaces + "- ";
+    const nth = spaces + "  ";
+
+    return first + options.fn(this).replace(/\n(?!\s*\n)/gm, `\n${nth}`).trim() + "\n";
+});
+
+/*
+ * Register a Handlebars helper that concatenates multiple variables. We use this to generate the
+ * title for the section partials.
+ */
+Handlebars.registerHelper("tf-a-concat", function () {
+    let argv = Array.prototype.slice.call(arguments, 0);
+
+    argv.pop();
+
+    return argv.join("");
+});
+
+function writerOpts(config) {
+    /*
+     * Flatten the configuration's sections list. This helps us iterate over all of the sections
+     * when we don't care about the hierarchy.
+     */
+
+    const flattenSections = function (sections) {
+        return sections.flatMap(section => {
+            const subsections = flattenSections(section.sections || []);
+
+            return [section].concat(subsections);
+        })
+    };
+
+    const flattenedSections = flattenSections(config.sections);
+
+    /*
+     * Register a helper to return a restructured version of the note groups that includes notes
+     * categorized by their section.
+     */
+    Handlebars.registerHelper("tf-a-notes", function (noteGroups, options) {
+        const generateTemplateData = function (sections, notes) {
+            return (sections || []).flatMap(section => {
+                const templateData = {
+                    title: section.title,
+                    sections: generateTemplateData(section.sections, notes),
+                    notes: notes.filter(note => section.scopes?.includes(note.commit.scope)),
+                };
+
+                /*
+                 * Don't return a section if it contains no notes and no sub-sections.
+                 */
+                if ((templateData.sections.length == 0) && (templateData.notes.length == 0)) {
+                    return [];
+                }
+
+                return [templateData];
+            });
+        };
+
+        return noteGroups.map(noteGroup => {
+            return {
+                title: noteGroup.title,
+                sections: generateTemplateData(config.sections, noteGroup.notes),
+                notes: noteGroup.notes.filter(note =>
+                    !flattenedSections.some(section => section.scopes?.includes(note.commit.scope))),
+            };
+        });
+    });
+
+    /*
+     * Register a helper to return a restructured version of the commit groups that includes commits
+     * categorized by their section.
+     */
+    Handlebars.registerHelper("tf-a-commits", function (commitGroups, options) {
+        const generateTemplateData = function (sections, commits) {
+            return (sections || []).flatMap(section => {
+                const templateData = {
+                    title: section.title,
+                    sections: generateTemplateData(section.sections, commits),
+                    commits: commits.filter(commit => section.scopes?.includes(commit.scope)),
+                };
+
+                /*
+                 * Don't return a section if it contains no notes and no sub-sections.
+                 */
+                if ((templateData.sections.length == 0) && (templateData.commits.length == 0)) {
+                    return [];
+                }
+
+                return [templateData];
+            });
+        };
+
+        return commitGroups.map(commitGroup => {
+            return {
+                title: commitGroup.title,
+                sections: generateTemplateData(config.sections, commitGroup.commits),
+                commits: commitGroup.commits.filter(commit =>
+                    !flattenedSections.some(section => section.scopes?.includes(commit.scope))),
+            };
+        });
+    });
+
+    const writerOpts = ccWriterOpts(config)
+        .then(writerOpts => {
+            const ccWriterOptsTransform = writerOpts.transform;
+
+            /*
+             * These configuration properties can't be injected directly into the template because
+             * they themselves are templates. Instead, we register them as partials, which allows
+             * them to be evaluated as part of the templates they're used in.
+             */
+            Handlebars.registerPartial("commitUrl", config.commitUrlFormat);
+            Handlebars.registerPartial("compareUrl", config.compareUrlFormat);
+            Handlebars.registerPartial("issueUrl", config.issueUrlFormat);
+
+            /*
+             * Register the partials that allow us to recursively create changelog sections.
+             */
+
+            const notePartial = readFileSync(resolve(__dirname, "./templates/note.hbs"), "utf-8");
+            const noteSectionPartial = readFileSync(resolve(__dirname, "./templates/note-section.hbs"), "utf-8");
+            const commitSectionPartial = readFileSync(resolve(__dirname, "./templates/commit-section.hbs"), "utf-8");
+
+            Handlebars.registerPartial("tf-a-note", notePartial);
+            Handlebars.registerPartial("tf-a-note-section", noteSectionPartial);
+            Handlebars.registerPartial("tf-a-commit-section", commitSectionPartial);
+
+            /*
+             * Override the base templates so that we can generate a changelog that looks at least
+             * similar to the pre-Conventional Commits TF-A changelog.
+             */
+            writerOpts.mainTemplate = readFileSync(resolve(__dirname, "./templates/template.hbs"), "utf-8");
+            writerOpts.headerPartial = readFileSync(resolve(__dirname, "./templates/header.hbs"), "utf-8");
+            writerOpts.commitPartial = readFileSync(resolve(__dirname, "./templates/commit.hbs"), "utf-8");
+            writerOpts.footerPartial = readFileSync(resolve(__dirname, "./templates/footer.hbs"), "utf-8");
+
+            writerOpts.transform = function (commit, context) {
+                /*
+                 * Fix up commit trailers, which for some reason are not correctly recognized and
+                 * end up showing up in the breaking changes.
+                 */
+
+                commit.notes.forEach(note => {
+                    const trailers = execa.sync("git", ["interpret-trailers", "--parse"], {
+                        input: note.text
+                    }).stdout;
+
+                    note.text = note.text.replace(trailers, "").trim();
+                });
+
+                return ccWriterOptsTransform(commit, context);
+            };
+
+            return writerOpts;
+        });
+
+    return writerOpts;
+}
+
+module.exports = function (parameter) {
+    const config = parameter || {};
+
+    return Q.all([
+        ccConventionalChangelog(config),
+        ccParserOpts(config),
+        ccRecommendedBumpOpts(config),
+        writerOpts(config)
+    ]).spread((
+        conventionalChangelog,
+        parserOpts,
+        recommendedBumpOpts,
+        writerOpts
+    ) => {
+        if (_.isFunction(parameter)) {
+            return parameter(null, {
+                gitRawCommitsOpts: { noMerges: null },
+                conventionalChangelog,
+                parserOpts,
+                recommendedBumpOpts,
+                writerOpts
+            });
+        } else {
+            return {
+                conventionalChangelog,
+                parserOpts,
+                recommendedBumpOpts,
+                writerOpts
+            };
+        }
+    });
+};