Docsource is a command-line interface (CLI) tool that detects broken links within Markdown documentation files in your source code.

• Download
• Overview
  • External Links
  • Relative Links
  • Mailto Links
• Usage
  • Scan
• Continuous Integration
  • GitLab CI/CD
• FAQ
• Motivation

You can download Docsource from the GitHub releases page. It is available in three different formats:

• JAR (requires Java 21 since v1.0.3 and Java 17 before)
• Windows
• Linux

Docsource can check three types of Markdown links: external links, relative links, and mailto links.

External links are links that point to an external domain. Docsource sends an HTTP request to check the HTTP return code:

• The link is considered broken if the return code is 404.
• The link is considered valid if the return code is anything other than 404.

Relative links are used for links within the same domain. Docsource checks whether the linked resource actually exists:

• The link is considered broken if the linked resource does not exist.
• The link is considered valid if the linked resource exists.

A relative link can be either absolute or relative:

• Absolute links are checked from the user's current directory.
• Relative links are checked from the file to which the link belongs, unless the --all-absolute flag is enabled.

Mailto links are used to include a link with an email address. Docsource checks the format of the linked email address:

• The link is considered broken if the format is incorrect.
• The link is considered valid if the format is correct.

   ____
  (|   \
   |    | __   __   ,   __          ,_    __   _
  _|    |/  \_/    / \_/  \_|   |  /  |  /    |/
 (/\___/ \__/ \___/ \/ \__/  \_/|_/   |_/\___/|__/


Description:

Scan documentation.

Parameters:
      [files...]        Directories or files to scan.

Options:
  -A, --all-absolute    Consider relative link paths as absolute paths.
  -c, --current-dir=<currentDir>
                        Override the current directory.
  -h, --help            Show this help message and exit.
  -k, --insecure        Turn off hostname and certificate chain verification.
  -p, --path-prefix=<pathPrefix>
                        Prefix the beginning of relative links with a partial path.
  -r, --recursive       Scan directories recursively.
      --skip-external   Skip external links.
      --skip-mailto     Skip mailto links.
      --skip-relative   Skip relative links.
  -V, --version         Print version information and exit.

Scan is used to scan Markdown files in your documentation to detect broken links. The command should be run at the root folder of your documentation.

You can provide multiple folders or files as input to Scan by specifying them after the command:

docsource scan directory1 directory2 file1.md file2.md

Depending on how your documentation is built (e.g., a custom Angular/React project that parses Markdown files), you may need to consider relative link paths as absolute paths or add a prefix to your relative paths.

• E.g., you may want [link](./folder-two/README) to be checked from your current directory rather than the " folder-two" directory.
• E.g., your link is [link](./folder-two/README) but the actual path is /content/folder-two/README where content is handled automatically by your parser.

To handle such cases, you can use the following options:

• --all-absolute to check relative link paths as absolute paths
• --path-prefix to add a partial path at the beginning of each relative link

Docsource can be run in a GitLab pipeline using the Docker image.

check links:
  stage: verify 🩺
  image: loicgreffier/docsource:latest
  script:
    - docsource scan --recursive .

How can Docsource trust my SSL certificates

You can make Docsource trust your SSL certificates if you need it.

If you use the JAR, add your SSL certificates in the JVM cacerts.

If you use the native executables, you can load a trust store dynamically at runtime as specified by GraalVM.

docsource scan . -Djavax.net.ssl.trustStore=pathToTheTrustStore -Djavax.net.ssl.trustStorePassword=trustStorePassword

Maintaining documentation with tens or hundreds of pages can be a pain, and there's nothing more frustrating for readers than encountering broken links. Docsource helps keep documentation up-to-date and detects broken links.

It was also an opportunity to test out Spring Native!