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Monthly Downloads: 8
Programming language: Haskell
License: GNU General Public License v3.0 only
Tags: Text    
Latest version: v0.2.0

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README

submark: Extract a part from CommonMark/Markdown docs

CircleCI Hackage

submark is a CLI program to extract some particular section from a given CommonMark/Markdown document. I use it for myself to extract the latest version section from the CHANGELOG.md file, and then reuse the text for the corresponding release note on GitHub releases, during automated release process which is run on CI.

Download & installation

For Linux x86_64, executable binaries are available on GitHub releases. Each file is a single executable, and statically linked so that it's executable as a standalone without dependencies.

For other platforms, you need to build it by yourself. It's written in Haskell, so you need to install Haskell Stack first. It can be built in the same way other Haskell programs are:

$ stack setup && stack install

I'm going to officially support executable binaries for other platforms if anyone asks. (I thought submark wouldn't be useful on other than Linux since the most of CI machines are Linux, but it might be wrong.)

Usage examples

The following examples use John Gruber's original Markdown introduction:

$ wget https://daringfireball.net/projects/markdown/index.text

Extracting an H3 heading Command-Line:

$ submark --h3 "Command-Line" index.text
### Command-Line

Use the `--html4tags` command-line switch to produce HTML output from a
Unix-style command line. E.g.:

    % perl Markdown.pl --html4tags foo.text

Type `perldoc Markdown.pl`, or read the POD documentation within the
Markdown.pl source code for more information.

Note that its textual style differ from the original text. Since submark internally builds an abstract syntax tree from the given input text and then render again the result tree, it doesn't maintain trivial styles (e.g., whitespaces, ATX vs. Setext headings) but only the semantics.

There are options from --h1 to --h6:

$ submark --h2 "Download" index.text
## Download

[Markdown 1.0.1](http://daringfireball.net/projects/downloads/Markdown_1.0.1.zip)
(18 KB) -- 17 Dec 2004

The leading heading can be omitted:

$ submark --h2 "Download" --omit-heading index.text
[Markdown 1.0.1](http://daringfireball.net/projects/downloads/Markdown_1.0.1.zip)
(18 KB) -- 17 Dec 2004

Matching is case sensitive by default, but case can be ignored using the option -i/--ignore-case:

$ submark --h2 "DOWNload" index.text

$ submark --h2 "DOWNload" --ignore-case index.text
## Download

[Markdown 1.0.1](http://daringfireball.net/projects/downloads/Markdown_1.0.1.zip)
(18 KB) -- 17 Dec 2004

By Unix convention, - means pipe:

$ submark --h2 "Download" - < index.text
## Download

[Markdown 1.0.1](http://daringfireball.net/projects/downloads/Markdown_1.0.1.zip)
(18 KB) -- 17 Dec 2004

There's -o/--out-file option as well:

$ submark -o download.md --h2 "Download" index.text