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Description:

mason cli

Mason CLI allows developers to create and consume reusable templates called bricks powered by the mason generator.

Quick Start #
# 🎯 Activate from https://pub.dev
dart pub global activate mason_cli

# 🚀 Initialize mason
mason init

# 📦 Install your first brick
mason add hello

# 🧱 Use your first brick
mason make hello
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Table of Contents #

Quick Start
Table of Contents
Overview

Installation
Initializing
Command Line Variables
Variable Prompts
Config File for Input Variables
Custom Output Directory
File Conflict Resolution

Creating New Bricks

Brick YAML
Brick Template

Nested Templates (partials)
File Resolution
Built-in Lambdas
Detecting Changes After Generation
Custom Script Execution (Hooks)

Hooks Usage

Searching for Bricks

Search Usage

Adding Bricks

Add Usage

Removing Bricks

Remove Usage

List Installed Bricks

List Usage

Upgrade Bricks

Upgrade Usage

Bundling

Bundle Usage

Unbundling

Unbundle Usage

Login

Login Usage

Logout

Logout Usage

Publishing Bricks

Publish Usage

Complete Usage
Video Tutorial

Overview #
Installation #
# 🎯 Activate from https://pub.dev
dart pub global activate mason_cli

# 🍺 Or install from https://brew.sh
brew tap felangel/mason
brew install mason
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Initializing #
mason init
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mason init initializes the Mason CLI in the current directory.
Running mason init generates a mason.yaml so that you can get started immediately.
# Register bricks which can be consumed via the Mason CLI.
# Run "mason get" to install all registered bricks.
# To learn more, visit https://docs.brickhub.dev.
bricks:
# Bricks can be imported via version constraint from a registry.
# Uncomment the following line to import the "hello" brick from BrickHub.
# hello: 0.1.0+1
# Bricks can also be imported via remote git url.
# Uncomment the following lines to import the "widget" brick from git.
# widget:
# git:
# url: https://github.com/felangel/mason.git
# path: bricks/widget
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For example, we can uncomment the "hello" brick (hello: 0.1.0+1):
bricks:
hello: 0.1.0+1
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Next, get all bricks registered in mason.yaml via:
mason get
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Then you can use mason make to generate your first file:
mason make hello
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❗ Note: DO NOT commit the .mason directory. DO commit the mason-lock.json file when working with versioned bricks (git/hosted).
Command Line Variables #
Any variables can be passed as command line args.
mason make hello --name Felix
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Variable Prompts #
Any variables which aren't specified as command line args will be prompted.
mason make hello
name: Felix
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Config File for Input Variables #
Any variables can be passed via a config file:
mason make hello -c config.json
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where config.json is:
{
"name": "Felix"
}
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The above commands will all generate HELLO.md in the current directory with the following content:
Hello Felix!
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Custom Output Directory #
By default mason make will generate the template in the current working directory but a custom output directory can be specified via the -o option:
mason make hello --name Felix -o ./path/to/directory
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File Conflict Resolution #
By default, mason make will prompt on each file conflict and will allow users to specify how the conflict should be resolved via Yyna:
y - yes, overwrite (default)
Y - yes, overwrite this and all others
n - no, do not overwrite
a - append to existing file
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A custom file conflict resolution strategy can be specified via the --on-conflict option:
# Always prompt when there is a file conflict (default)
mason make hello --name Felix --on-conflict prompt

# Always overwrite when there is a file conflict
mason make hello --name Felix --on-conflict overwrite

# Always skip when there is a file conflict
mason make hello --name Felix --on-conflict skip

# Always append when there is a file conflict
mason make hello --name Felix --on-conflict append
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Creating New Bricks #
Create a new brick using the mason new command.
# Generate a new brick in the current directory.
mason new <BRICK_NAME>

# Generate a new brick with a custom description.
mason new <BRICK_NAME> --desc "My awesome, new brick!"

# Generate a new brick with hooks.
mason new <BRICK_NAME> --hooks

# Generate a new brick in custom path.
mason new <BRICK_NAME> --output-dir ./path/to/brick

# Generate a new brick in custom path shorthand syntax.
mason new <BRICK_NAME> -o ./path/to/brick
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Brick YAML #
The brick.yaml contains metadata for a brick template.
name: example
description: An example brick

# The following defines the version and build number for your brick.
# A version number is three numbers separated by dots, like 1.2.34
# followed by an optional build number (separated by a +).
version: 0.1.0+1

# The following defines the environment for the current brick.
# It includes the version of mason that the brick requires.
environment:
mason: ">=0.1.0-dev <0.1.0"

# Variables specify dynamic values that your brick depends on.
# Zero or more variables can be specified for a given brick.
# Each variable has:
# * a type (string, number, boolean, enum, array, or list)
# * an optional short description
# * an optional default value
# * an optional list of default values (array only)
# * an optional prompt phrase used when asking for the variable
# * a list of values (enums only)
# * an optional separator (list only)
vars:
name:
type: string
description: Your name.
default: Dash
prompt: What is your name?
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Brick Template #
Write your brick template in the __brick__ directory using mustache templates. See the mustache manual for detailed usage information.
__brick__/example.md
# Hello {{name}}!
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❗ Note: __brick__ can contain multiple files and subdirectories
❗ Note: use {{{variable}}} instead of {{variable}} when you want the value of variable to be unescaped
Nested Templates (partials)
It is possible to have templates nested within other templates. For example, given the follow structure:
├── HELLO.md
├── {{~ footer.md }}
└── {{~ header.md }}
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The {{~ header.md }} and {{~ footer.md }} are partials (partial brick templates). Partials will not be generated but can be included as part of an existing template.
❗ Note: Partials must always be directly under the __brick__ directory. Non-top-level partials are yet to be
supported.
For example given the contents of {{~ header.md }} and {{~ footer.md }} respectively
# 🧱 {{name}}
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_made with 💖 by mason_
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we can include the partials as part of a template via {{> header.md }} and {{> footer.md }}.
In this example, given HELLO.md:
{{> header.md }}

Hello {{name}}!

{{> footer.md }}
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We can use mason make hello --name Felix to generate HELLO.md:
# 🧱 Felix

Hello Felix!

_made with 💖 by mason_
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❗ Note: Partials can contain variables just like regular templates
File Resolution
It is possible to resolve files based on path input variables using the {{% %}} tag.
For example, given the following brick.yaml:
name: app_icon
description: Create an app icon file from a URL
version: 0.1.0+1
vars:
url:
type: string
description: The app icon URL.
prompt: Enter your app icon URL.
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And the following brick template:
__brick__/{{% url %}}
Running mason make app_icon --url path/to/icon.png will generate icon.png with the contents of path/to/icon.png where the path/to/icon.png can be either a local or remote path. Check out the app icon example brick to try it out.
Built-in Lambdas
Mason supports a handful of built-in lambdas that can help with customizing generated code:

Name
Example
Shorthand Syntax
Full Syntax

camelCase
helloWorld
{{variable.camelCase()}}
{{#camelCase}}{{variable}}{{/camelCase}}

constantCase
HELLO_WORLD
{{variable.constantCase()}}
{{#constantCase}}{{variable}}{{/constantCase}}

dotCase
hello.world
{{variable.dotCase()}}
{{#dotCase}}{{variable}}{{/dotCase}}

headerCase
Hello-World
{{variable.headerCase()}}
{{#headerCase}}{{variable}}{{/headerCase}}

lowerCase
hello world
{{variable.lowerCase()}}
{{#lowerCase}}{{variable}}{{/lowerCase}}

mustacheCase
{{ Hello World }}
{{variable.mustacheCase()}}
{{#mustacheCase}}{{variable}}{{/mustacheCase}}

pascalCase
HelloWorld
{{variable.pascalCase()}}
{{#pascalCase}}{{variable}}{{/pascalCase}}

pascalDotCase
Hello.World
{{variable.pascalDotCase()}}
{{#pascalDotCase}}{{variable}}{{/pascalDotCase}}

paramCase
hello-world
{{variable.paramCase()}}
{{#paramCase}}{{variable}}{{/paramCase}}

pathCase
hello/world
{{variable.pathCase()}}
{{#pathCase}}{{variable}}{{/pathCase}}

sentenceCase
Hello world
{{variable.sentenceCase()}}
{{#sentenceCase}}{{variable}}{{/sentenceCase}}

snakeCase
hello_world
{{variable.snakeCase()}}
{{#snakeCase}}{{variable}}{{/snakeCase}}

titleCase
Hello World
{{variable.titleCase()}}
{{#titleCase}}{{variable}}{{/titleCase}}

upperCase
HELLO WORLD
{{variable.upperCase()}}
{{#upperCase}}{{variable}}{{/upperCase}}

Example Usage
Given the following example brick:
__brick__
├── {{name.snakeCase()}}.md
└── {{name.pascalCase()}}.java
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brick.yaml:
name: example
description: An example brick.
version: 0.1.0+1
vars:
name:
type: string
description: Your name
default: Dash
prompt: What is your name?
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We can generate code via:
mason make example --name my-name
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The output will be:
├── my_name.md
└── MyName.java
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Detecting Changes After Generation
Mason supports verifying that mason make did not change any files via the --set-exit-if-changed flag. This is often useful in continuous integration (CI) environments to ensure all generated code is up to date.
# fail with exit code 70 if any files were changed
mason make example --name Dash --set-exit-if-changed
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Custom Script Execution (Hooks)
Mason supports custom script execution via hooks. The supported hooks are:

pre_gen - executed immediately before the generation step
post_gen - executed immediately after the generation step

Hooks must be defined in the hooks directory at the root of the brick:
├── __brick__
├── brick.yaml
└── hooks
├── post_gen.dart
├── pre_gen.dart
└── pubspec.yaml
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❗ Currently mason only supports hooks written in Dart.
Hooks Usage
Every hook must contain a run method which accepts a HookContext from package:mason/mason.dart.
For example, given the following example brick:
.
├── __brick__
│ └── example.md
├── brick.yaml
└── hooks
├── post_gen.dart
└── pubspec.yaml
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where brick.yaml looks like:
name: example
description: An example brick.
version: 0.1.0+1
vars:
name:
type: string
description: Your name
default: Dash
prompt: What is your name?
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and pubspec.yaml looks like:
name: example_hooks

environment:
sdk: ">=2.12.0 <3.0.0"

dependencies:
mason: any
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And post_gen.dart contains:
import 'package:mason/mason.dart';

void run(HookContext context) {
context.logger.info('hello {{name}}!');
}
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The result of running mason make example --name Dash would be:
mason make example --name Dash
✓ Made brick example (0.0s)
✓ Generated 1 file:
/Users/dash/mason/example/example.md (new)
hello Dash!
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💡 Note: Scripts can contain template variables. In addition, the working directory of the script is the directory in which the code is generated.
HookContext can be used to access/modify the brick vars or to interface with the logger.
import 'package:mason/mason.dart';

void run(HookContext context) {
// Read/Write vars
context.vars = {...context.vars, 'custom_var': 'foo'};

// Use the logger
context.logger.info('hook says hi!');
}
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Hook execution can be disabled using the --no-hooks flag:
# Disable hook script execution
mason make example --name Dash --no-hooks
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Searching for Bricks #
The search command allows developers to search published bricks on https://brickhub.dev.
Search Usage #
# search for bricks related to "bloc"
mason search bloc
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Adding Bricks #
The add command allows developers to add brick templates locally or globally on their machines from either a local path or git url. By default mason add will add the template locally but bricks can be added globally by providing the --global (-g) flag.
Add Usage #
# add latest version from registry
mason add my_brick

# add latest version from registry (global)
mason add --global my_brick

# add version 0.1.0 from registry
mason add my_brick 0.1.0

# add version 0.1.0 from registry (global)
mason add --global my_brick 0.1.0

# add from registry shorthand syntax (global)
mason add -g my_brick

# add from path
mason add my_brick --path ./path/to/my_brick

# add from path (global)
mason add --global my_brick --path ./path/to/my_brick

# add from path shorthand syntax (global)
mason add -g my_brick --path ./path/to/my_brick

# add from git url
mason add my_brick --git-url https://github.com/org/repo

# add from git url (global)
mason add -g my_brick --git-url https://github.com/org/repo

# add from git url with path
mason add my_brick --git-url https://github.com/org/repo --git-path path/to/my_brick

# add from git url with path and ref
mason add my_brick --git-url https://github.com/org/repo --git-path path/to/my_brick --git-ref tag-name
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Once a brick is added it can be used via the mason make command:
mason make <BRICK_NAME>
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Removing Bricks #
Bricks can be removed by using the remove command. Use the --global (-g) flag to remove global bricks.
Remove Usage #
# remove brick
mason remove <BRICK_NAME>

# remove brick (global)
mason remove -g <BRICK_NAME>
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List Installed Bricks #
All installed bricks can be seen via the list (ls for short) command.
List Usage #
# list all locally installed bricks
mason list

# list all globally installed bricks
mason list --global

# use alias "ls" instead of "list" for a shorthand syntax
mason ls

# list all globally installed bricks shorthand syntax
mason ls -g
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Upgrade Bricks #
Installed bricks can be upgraded to their latest versions via the upgrade command.
Upgrade Usage #
# upgrade all local bricks and generate a new mason-lock.json
mason upgrade

# upgrade all global bricks
mason upgrade --global

# upgrade all global bricks shorthand syntax
mason upgrade -g
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Bundling #
You can use mason to generate a bundle for an existing template. Bundles are convenient for cases where you want to include your template as part of a standalone CLI. Very Good CLI is a great example.
There are currently two types of bundles:

Universal - a platform-agnostic bundle
Dart - a Dart specific bundle

Bundle Usage #
To generate a bundle:
# Create a universal bundle from a local brick.
mason bundle ./path/to/brick -o ./path/to/destination

# Create a dart bundle from a local brick.
mason bundle ./path/to/brick -t dart -o ./path/to/destination

# Create a universal bundle from a git brick.
mason bundle --source git https://github.com/:org/:repo -o ./path/to/destination

# Create a dart bundle from a git brick.
mason bundle --source git https://github.com/:org/:repo -t dart -o ./path/to/destination

# Create a universal bundle from a hosted brick.
mason bundle --source hosted <BRICK_NAME> -o ./path/to/destination

# Create a dart bundle from a hosted brick.
mason bundle --source hosted <BRICK_NAME> -t dart -o ./path/to/destination
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A bundle can then be used to generate code from a brick programmatically:
// Create a MasonGenerator from the existing bundle.
final generator = MasonGenerator.fromBundle(...);

// Generate code based on the bundled brick.
await generator.generate(...);
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Unbundling #
You can use mason to generate a brick from an existing bundle. Unbundling is useful in cases where you want to make changes to an existing bundle because you can first unbundle, make the changes to the template, and generate a new bundle.
Unbundle Usage #
To generate a brick template from an existing bundle:
# Universal Bundle
mason unbundle ./path/to/bundle -o ./path/to/destination/

# Dart Bundle
mason unbundle ./path/to/bundle -t dart -o ./path/to/destination/
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Login #
You can login with a registered account via the login command.
Login Usage #
# login with email and password
mason login
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Logout #
You can logout of an account via the logout command.
Logout Usage #
# logout of the current account
mason logout
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Publishing Bricks #
You can publish a brick via the publish command. You must be logged in to an account with a verified email address in order to publish.
❗ Note: once a brick has been published, it can never be unpublished.
Publish Usage #
# publish brick in the current directory
mason publish

# publish brick from custom path
mason publish --directory ./path/to/brick

# publish brick from custom path shorthand syntax
mason publish -C ./path/to/brick
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Complete Usage #
mason
🧱 mason • lay the foundation!

Usage: mason <command> [arguments]

Global options:
-h, --help Print this usage information.
--version Print the current version.

Available commands:
add Adds a brick from a local or remote source.
bundle Generates a bundle from a brick template.
cache Interact with mason cache.
get Gets all bricks in the nearest mason.yaml.
init Initialize mason in the current directory.
list Lists installed bricks.
login Log into brickhub.dev.
logout Log out of brickhub.dev.
make Generate code using an existing brick template.
new Creates a new brick template.
publish Publish the current brick to brickhub.dev.
remove Removes a brick.
search Search published bricks on brickhub.dev.
unbundle Generates a brick template from a bundle.
update Update mason.
upgrade Upgrade bricks to their latest versions.

Run "mason help <command>" for more information about a command.
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Video Tutorial #

Say HI to Mason Package! - The Top Tier Code Generation Tool | Complete Tutorial by Flutterly