Subset

This CLI extension adds the command subset that generates a config file for a subset (i.e. a detached part) of the Foliant project. The command uses:

• the common (i.e. default, single) config file for the whole Foliant project;
• the part of config that is individual for each subset. The Foliant project may include multiple subsets that are defined by their own partial config files.

The command subset takes a path to the subset directory as a mandatory command line parameter.

The command subset:

• reads the partial config of the subset;
• optionally rewrites the paths of Markdown files that specified there in the chapters section;
• merges the result with the default config of the whole Foliant project config;
• finally, writes a new config file that allows to build a certain subset of the Foliant project with the make command.

Installation

To install the extension, use the command:

$ pip install foliantcontrib.subset

Usage

To get the list of all necessary parameters and available options, run foliant subset --help:

$ foliant subset --help
usage: foliant subset [-h] [-p PROJECT_DIR_PATH] [-c CONFIG] [-n] [-d] SUBPATH

Generate the config file to build the project subset from SUBPATH.

positional arguments:
  SUBPATH               Path to the subset of the Foliant project

optional arguments:
  -h, --help            show this help message and exit
  -p PROJECT_DIR, --path PROJECT_DIR
                        Path to the Foliant project
  -c CONFIG, --config CONFIG
                        Name of config file of the Foliant project, default 'foliant.yml'
  -n, --norewrite       Do not rewrite the paths of Markdown files in the subset partial config
  -d, --debug           Log all events during build. If not set, only warnings and errors are logged

In most cases it’s enough to use the default values of optional parameters. You need to specify only the SUBPATH—the directory that should be located inside the Foliant project source directory.

Suppose you use the default settings. Then you have to prepare:

• the common (default) config file foliant.yml in the Foliant project root directory;
• partial config files for each subset. They also must be named foliant.yml, and they must be located in the directories of the subsets.

Your Foliant project tree may look so:

$ tree
.
├── foliant.yml
└── src
    ├── group_1
    │   ├── product_1
    │   │   └── feature_1
    │   │       ├── foliant.yml
    │   │       └── index.md
    │   └── product_2
    │       ├── foliant.yml
    │       └── main.md
    └── group_2
        ├── foliant.yml
        └── intro.md

The command foliant subset group_1/product_1/feautre_1 will merge the files ./src/group_1/product_1/feautre_1/foliant.yml and ./foliant.yml, and write the result into the file ./foliant.yml.subset.

After that you may use the command like the following to build your Foliant project:

$ foliant make pdf --config foliant.yml.subset

Let’s look at some examples.

The content of the common (default) file ./foliant.yml:

title: &title Default Title

subtitle: &subtitle Default Subtitle

version: &version 0.0

backend_config:
    pandoc:
        template: !path /somewhere/template.tex
        reference_docx: !path /somewhere/reference.docx
        vars:
            title: *title
            version: *version
            subtitle: *subtitle
            year: 2018
        params:
            pdf_engine: xelatex

The content of the partial config file ./src/group_1/product_1/feautre_1/foliant.yml:

title: &title Group 1, Product 1, Feature 1

subtitle: &subtitle Technical Specification

version: &version 1.0

chapters:
    - index.md

backend_config:
    pandoc:
        vars:
            year: 2019

The content of newly generated file ./foliant.yml.subset:

title: &title Group 1, Product 1, Feature 1
subtitle: &subtitle Technical Specification
version: &version 1.0
backend_config:
    pandoc:
        template: !path /somewhere/template.tex
        reference_docx: !path /somewhere/reference.docx
        vars:
            title: *title
            version: *version
            subtitle: *subtitle
            year: 2019
        params:
            pdf_engine: xelatex
chapters:
- b2b/order_1/feature_1/index.md

If the option --no-rewrite is not set, the paths of Markdown files that are specified in the chapters section of the file ./src/group_1/product_1/feautre_1/foliant.yml, will be rewritten as if these paths were relative to the directory ./src/group_1/product_1/feautre_1/.

Otherwise, the Subset CLI extension will not rewrite the paths of Markdown files as if they were relative to ./src/ directory.

Note that the Subset CLI Extension merges the data of the config files recursively, so any subkeys of default config may be overridden by the settings of partial config.