charlike/templates/node_modules/conventional-changelog-core/index.js

Small, fast, simple and streaming project scaffolder for myself, but not only. Supports hundreds of template engines through the @JSTransformers API or if you want custom `render` function passed through options

'use strict';
var gitRawCommits = require('git-raw-commits');
var conventionalCommitsParser = require('conventional-commits-parser');
var conventionalChangelogWriter = require('conventional-changelog-writer');
var stream = require('stream');
var through = require('through2');
var mergeConfig = require('./lib/merge-config');

function conventionalChangelog(options, context, gitRawCommitsOpts, parserOpts, writerOpts) {
  writerOpts = writerOpts || {};

  var readable = new stream.Readable({
    objectMode: writerOpts.includeDetails
  });
  readable._read = function() {};

  mergeConfig(options, context, gitRawCommitsOpts, parserOpts, writerOpts)
    .then(function(data) {
      options = data.options;
      context = data.context;
      gitRawCommitsOpts = data.gitRawCommitsOpts;
      parserOpts = data.parserOpts;
      writerOpts = data.writerOpts;

      gitRawCommits(gitRawCommitsOpts)
        .on('error', function(err) {
          err.message = 'Error in git-raw-commits: ' + err.message;
          setImmediate(readable.emit.bind(readable), 'error', err);
        })
        .pipe(conventionalCommitsParser(parserOpts))
        .on('error', function(err) {
          err.message = 'Error in conventional-commits-parser: ' + err.message;
          setImmediate(readable.emit.bind(readable), 'error', err);
        })
        // it would be better if `gitRawCommits` could spit out better formatted data
        // so we don't need to transform here
        .pipe(through.obj(function(chunk, enc, cb) {
          try {
            options.transform.call(this, chunk, cb);
          } catch (err) {
            cb(err);
          }
        }))
        .on('error', function(err) {
          err.message = 'Error in options.transform: ' + err.message;
          setImmediate(readable.emit.bind(readable), 'error', err);
        })
        .pipe(conventionalChangelogWriter(context, writerOpts))
        .on('error', function(err) {
          err.message = 'Error in conventional-changelog-writer: ' + err.message;
          setImmediate(readable.emit.bind(readable), 'error', err);
        })
        .pipe(through({
          objectMode: writerOpts.includeDetails
        }, function(chunk, enc, cb) {
          try {
            readable.push(chunk);
          } catch (err) {
            setImmediate(function() {
              throw err;
            });
          }

          cb();
        }, function(cb) {
          readable.push(null);

          cb();
        }));
    })
    .catch(function(err) {
      setImmediate(readable.emit.bind(readable), 'error', err);
    });

  return readable;
}

module.exports = conventionalChangelog;