Crate guidon

guidon

guidon performs templating based on handlebars templating system.

Usage

Files to be handles needs to have an .hbs extension. Folders and files names can be templatized too : {{folder/subfolder}} The entry point is the Guidon structure.

Basic init

use guidon::Guidon;
use std::collections::HashMap;
use std::path::PathBuf;

 let mut guidon = Guidon::new(PathBuf::from("path/to/template/dir"));
 let mut vars = HashMap::new();
 vars.insert("key1".to_string(), "value1".to_string());
 guidon.apply_template("path/to/destination").unwrap();

With this initialization:

• guidon will use the vars map to find substitution values.
• guidon will parse the directory path/to/template/dir/template
• the result will be written in path/to/destination

TryNew init

guidon implements a TryNew trait to initialize from a dir or a git repo

TryNew from path

use guidon::{Guidon, TryNew};

let mut guidon = Guidon::try_new("path/to/template/dir").unwrap();

With this initialization:

• guidon will init the substitution variables from path/to/template/dir/variables.toml
• guidon will parse the directory path/to/template/dir/template

use guidon::{Guidon, TryNew};

let mut guidon = Guidon::try_new("path/to/template/dir/my_vars.toml").unwrap();
guidon.use_template_dir(false);

With this initialization:

• guidon will init the substitution variables from path/to/template/dir/my_vars.toml
• guidon will parse the directory path/to/template/dir

TryNew from git repo

use guidon::{{Guidon, TryNew, GitOptions}};

let git = GitOptions::builder()
    .repo("url/to/repo")
    .credentials(("user".to_string(), "password".to_string()))
    .build()
    .unwrap();
let mut guidon = Guidon::try_new(git);

With this initialization

• guidon will clone the repo to a temporary directory
• guidon will init the substitutions variables from tmp/dir/template.toml
• when applying template, guidon will parse the directory tmp/dir/template

Template variables

The configuration file is structured as follows :

# Key value pairs for template substitution
[variables]
test1 = "test 1"
test2 = "test 2"

Callbacks

guidon offers the possiblity to provide two callbacks :

• a variables callback to operate on the variables before applying the template
• a render callback, which is called if a missing value is detected while rendering the template.

These callbacks could be use for user interaction, or default behaviour.

Variable callback

In this example, the callback will add " cb" to every value.

  use guidon::Guidon;
  use std::collections::HashMap;
  use std::path::PathBuf;
  let cb = |h: &mut HashMap<String, String>| {
          h.iter_mut().for_each(|(_, v)|  *v +=" cb");
  };
  let mut guidon = Guidon::new(PathBuf::from("template/path"));
  guidon.set_variables_callback(cb);

Render callback

In this example, the callback will replace any missing value by the key concatenated with "-cb"

use guidon::Guidon;
use std::collections::HashMap;
use std::path::PathBuf;

// this callback will add `-cb` to the key as a value
let cb = |h: String| {
        let mut s = h.clone();
        s.push_str("-cb");
        s
 };
let mut guidon = Guidon::new(PathBuf::from("template/path"));
guidon.set_render_callback(cb);

Logs

guidon uses the log facade.

Structs

GitOptions	GitOptions for git initialization. cf GitOptionsBuilder documentation.
Guidon	The Guidon structure
GuidonError

Traits

TryNew

Try to initialize Guidon from different sources