com.selesse.gradle.git.changelog.generator.ComplexChangelogGenerator.groovy Maven / Gradle / Ivy

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Generate Git changelogs for Gradle projects
There is a newer version: 0.3.0
package com.selesse.gradle.git.changelog.generator

import com.google.common.base.Joiner
import com.google.common.base.MoreObjects
import com.google.common.base.Splitter
import com.selesse.gradle.git.GitCommandExecutor

class ComplexChangelogGenerator implements ChangelogGenerator {
    final Map tagAndDateMap
    final GitCommandExecutor executor
    final boolean skipFirstTag

    ComplexChangelogGenerator(GitCommandExecutor executor, List tags, boolean skipFirstTag) {
        this.executor = executor
        this.tagAndDateMap = tags.collectEntries {
            def tagAndDate = Splitter.on("|").omitEmptyStrings().trimResults().splitToList(it) as List
            if (tagAndDate.size() != 2) {
                tagAndDate = [tagAndDate.get(0), null]
            }
            [(tagAndDate.get(0)): tagAndDate.get(1)]
        } as Map
        this.skipFirstTag = skipFirstTag
    }

    String generateChangelog() {
        List changelogs = []

        def dateCommitMap = tagAndDateMap.keySet().collectEntries {
            [(executor.getCommitDate(it)): it]
        } as Map

        def dates = dateCommitMap.keySet().sort()

        if (!skipFirstTag) {
            appendFirstCommitChangeLog(dates, dateCommitMap, tagAndDateMap, changelogs)
        }

        for (int i = 0; (i + 1) < dates.size(); i++) {
            def firstCommit = dateCommitMap.get(dates.get(i))

            def secondCommitDate = dates.get(i + 1)
            def secondCommit = dateCommitMap.get(secondCommitDate)

            secondCommitDate = MoreObjects.firstNonNull(tagAndDateMap.get(secondCommit), executor.getTagDate(secondCommit))

            def sectionTitle = "${executor.getTagName(secondCommit)} (${secondCommitDate})"
            def sectionChangelog = executor.getGitChangelog(firstCommit, secondCommit)

            changelogs << getChangelogSection(sectionTitle, sectionChangelog)
        }

        appendLastCommitChangelog(dateCommitMap, dates, changelogs)

        def reverseChangelogs = changelogs.reverse()
        return Joiner.on("\n").join(reverseChangelogs)
    }

    private List appendFirstCommitChangeLog(List dates, Map dateCommitMap, Map tagAndDateMap, List changelogs) {
        def secondCommitDate = dates.get(0)
        def secondCommit = dateCommitMap.get(secondCommitDate)

        secondCommitDate = MoreObjects.firstNonNull(tagAndDateMap.get(secondCommit), executor.getTagDate(secondCommit))

        def sectionTitle = "${executor.getTagName(secondCommit)} (${secondCommitDate})"
        def sectionChangelog = executor.getGitChangelog(secondCommit)
        changelogs << getChangelogSection(sectionTitle, sectionChangelog)
    }

    private void appendLastCommitChangelog(Map dateCommitMap, List dates, List changelogs) {
        def firstCommit = dateCommitMap.get(dates.last())
        def secondCommit = executor.getLatestCommit()
        def changelog = executor.getGitChangelog(firstCommit, secondCommit)
        if (changelog.length() > 0) {
            changelogs << getChangelogSection("Unreleased", changelog)
        }
    }

    String getChangelogSection(String sectionTitle, String sectionChangelog) {
        StringBuilder changelogSection = new StringBuilder()
        changelogSection.append(sectionTitle)
                .append('\n')
                .append('-'.multiply(sectionTitle.length()))
                .append('\n')
                .append(sectionChangelog)
                .append('\n')
        return changelogSection.toString()
    }

}