plugin-helpers.gradle

/*
 * Copyright 2017 ThoughtWorks, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import java.text.DecimalFormat

static String gitRevision() {
    def process = "git log -n 1 --format=%H".execute()
    process.waitFor()
    return process.text.stripIndent().trim()
}

static String distVersion() {
    def process = "git rev-list HEAD".execute()
    process.waitFor()
    return process.text.stripIndent().trim().split("\n").size()
}

static def getLastTag(boolean isExperimental) {
    try {
        def command = ["git", "describe", "--tags", "--abbrev=0"]
        if (!isExperimental) {
            command.add(command.size() - 1, '--match=*[^-exp]')
        }

        def process = command.join(" ").execute()
        process.waitFor()
        def result = process.text

        return result.trim()
    } catch (Exception e) {
        return null
    }
}

String getCommitsSinceLastTag(String from) {
    def hashStdOut = new ByteArrayOutputStream()
    def hashErrorOutput = new ByteArrayOutputStream()
    def commandToExecute = ["git", "log", "--no-merges", "--pretty=\"%h - %s\""]
    if (from) {
        commandToExecute.add("${from}..HEAD")
    }

    try {
        project.exec {
            commandLine commandToExecute
            standardOutput = hashStdOut
            errorOutput = hashErrorOutput
        }
    } catch (Exception e) {
        throw new GradleScriptException(hashErrorOutput.toString(), e)
    }

    return hashStdOut.toString().trim()
}

static String readableFileSize(long size) {
    if (size <= 0) return "0"
    final String[] units = ["B", "KB", "MB", "GB", "TB"]
    int digitGroups = (int) (Math.log10(size) / Math.log10(1024))
    return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups]
}

project.ext.git = {
    gitRevision = this.&gitRevision
    distVersion = this.&distVersion
    getLastTag = this.&getLastTag
    getCommitsSinceLastTag = this.&getCommitsSinceLastTag
    readableFileSize = this.&readableFileSize
}