TextileToMarkdownTest.java

package com.example;


import org.junit.Test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.stream.Collectors;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;


public class TextileToMarkdownTest {


    @Test
    public void testUL() throws Exception {
        String markdown = toMarkdown("* あああ\n** いいい");
        assertThat(markdown, is("-   あああ\n    -   いいい"));
    }

    @Test
    public void testH() throws Exception {
        String markdown = toMarkdown("h1. あああ\n\nh2. いいい");
        assertThat(markdown, is("# あああ\n\n## いいい"));
    }

    static String toMarkdown(String textile) throws IOException, InterruptedException {

        String[] cmd = {"docker", "run", "--rm", "--interactive", "pandoc/core", "--from", "textile", "--to", "markdown"};  // docker
        //String[] cmd = {"pandoc", "--from", "textile", "--to", "markdown"};  // pandoc

        Process p = new ProcessBuilder(cmd)
                //.redirectErrorStream(true) // エラーがでたらこれで調べる
                .start();

        try (BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream(), UTF_8))) {
            try (Writer writer = new OutputStreamWriter(p.getOutputStream(), UTF_8)) {
                writer.write(textile);
            }
            String markdown = reader.lines().collect(Collectors.joining("\n"));
            int exitValue = p.waitFor();
            if (exitValue != 0) {
                throw new IllegalStateException("cmd=[" + Arrays.asList(cmd) + "], " + "textile=[" + textile + "], " +
                        "markdown=[" + markdown + "], " + "exitValue=[" + exitValue + "]");
            }
            return markdown;
        }
    }
}