cargo-generate
cargo, make me a project
cargo-generate
is a developer tool to help you get up and running quickly with a new Rust
project by leveraging a pre-existing git repository as a template.
Here's an example of using cargo-generate
with this template:
Installation
Using cargo
with system's OpenSSL
See the openssl-sys
crate readme on how to obtain the OpenSSL library for your system. Alternatively, use the vendored-openssl
flag if you do not want to install OpenSSL.
Using cargo
with vendored OpenSSL
NOTE:
vendored-openssl
requires the following packages to be installed:
- libssl-dev
- gcc
- m4
- ca-certificates
- make
- perl
Manual Install:
-
Download the binary tarball for your platform from our releases page.
-
Unpack the tarball and place the binary
cargo-generate
in~/.cargo/bin/
Usage
Standard usage is to pass a --git
flag to cargo generate
or short cargo gen
. This will prompt you to enter the name of your project.
NOTE:
cargo gen
requires a cargo alias configuration
You can also pass the name of your project to the tool using the --name
or -n
flag:
Templates in subfolders
If the git repository contains multiple templates, the specific subfolder in the git repository may be specified like this:
NOTE: The specified
relative-template-path
will be used as the actual template root, whether or not this is actually true!
NOTE: When using the
subfolder
feature,cargo-generate
will search for thecargo-generate.toml
file in the subfolder first, traversing back towards the template root in case it is not found.
Generating into current dir
If the user wants to generate a template straight into the current folder, without creating a subfolder for the contents and without attempting to initialize a .git
repo or similar, the --init
flag can be used.
NOTE:
cargo-generate
will not allow any existing files to be overwritten and will fail to generate any files should there be any conflicts.
git over ssh
New in version 0.7.0 is the support for both public and private and ssh git remote urls. For example:
leads to the same result as:
as well as:
NOTE: you can pass a custom ssh identity file with via
-i | --identity
like-i ~/.ssh/id_rsa_other
http(s) proxy
New in version 0.7.0 is automatic proxy usage. So, if http(s)_PROXY env variables are provided, they will be used for cloning a http(s) template repository.
Favorites
Favorite templates can be defined in a config file, that by default is placed at $CARGO_HOME/cargo-generate.toml
or $CARGO_HOME/cargo-generate
.
To specify an alternative configuration file, use the --config <config-file>
option.
NOTE: A relative
--config
option, will be relative to the template root during expansion.
Each favorite template is specified in its own section, e.g.:
[]
= "<optional description, visible with --list-favorites>"
= "https://github.com/ashleygwilliams/wasm-pack-template"
= "<optional-branch>"
= "<optional-subfolder>"
Values may be overridden using the CLI arguments of the same names (e.g. --subfolder
for the subfolder
value).
When favorites are available, they can be generated simply by invoking:
cargo gen <favorite>
or slightly more involved:
cargo generate demo --branch mybranch --name expanded_demo --subfolder myfolder
NOTE: when
<favorite>
is not defined in the config file, it is interpreted as a git repo like as if--git <favorite>
Templates
Templates are git repositories whose files contain placeholders. The current supported placeholders are:
-
{{authors}}
this will be filled in by a function borrowed from Cargo's source code, that determines your information from Cargo's configuration.
-
{{project-name}}
this is supplied by either passing the
--name
flag to the command or working with the interactive CLI to supply a name. -
{{crate_name}}
the snake_case_version of
project-name
-
{{crate_type}}
this is supplied by either passing the
--bin
or--lib
flag to the command line, contains eitherbin
orlib
,--bin
is the default -
{{os-arch}}
contains the current operating system and architecture ex:
linux-x86_64
Additionally, all filters and tags of the liquid template language are supported.
For more information, check out the Liquid Documentation on Tags
and Filters
.
You can use those placeholders in the file and directory names of the generated project.
For example, for a project named awesome
, the filename {{project_name}}/{{project_name}}.rs
will be transformed to awesome/awesome.rs
during generation.
Only files that are not listed in the exclude settings will be templated.
NOTE: invalid characters for a filename or directory name will be sanitized after template substitution. Invalid is e.g.
/
or\
.
You can also add a .genignore
file to your template. The files listed in the .genignore
file
will be removed from the local machine when cargo-generate
is run on the end user's machine.
The .genignore
file is always ignored, so there is no need to list it in the .genignore
file.
Templates by the community
It's encouraged to classify your template repository with a GitHub topic labeled cargo-generate
.
So that every developer can find the template via cargo-generate topic on GitHub.
If you have a great template, please tag your repository with the topic and tweet about it by including the hashtag #cargogenerate
(since twitter does not support hashtags with -
).
Note: the list of currently available templates is still available, but is now deprecated.
Example for --bin
and --lib
A template could be prepared in a way to act as a binary or a library. For example the Cargo.toml
might look like:
[]
# the usual stuff
[]
{% if crate_type == "bin" %}
= "0.3.21"
{% endif %}
# other general dependencies
{% if crate_type == "bin" %}
[[]]
= "src/main.rs"
= "{{crate_name}}-cli"
{% endif %}
Now a user of this template could decide weather they want the binary version by passing --bin
or use only the library version by passing --lib
as a command line argument.
Template defined placeholders
Sometimes templates need to make decisions. For example one might want to conditionally include some code or not. Another use case might be that the user of a template should be able to choose out of provided options in an interactive way. Also, it might be helpful to offer a reasonable default value that the user just simply can use.
Since version 0.6.0 it is possible to use placeholders in a cargo-generate.toml
that is in the root folder of a template.
Here an example:
[]
= "string"
= "What hypervisor to use?"
= ["uhyve", "qemu"]
= "qemu"
[]
= "bool"
= "Want to enable network?"
= true
As you can see the placeholders
configuration section accepts a table of keywords that will become the placeholder name.
In this example the placeholder hypervisor
and network_enabled
will become template variables and can be used like this:
use TcpListener;
Tip: similar to
dependencies
in theCargo.toml
file you can also list them as one liners:
[]
= { = "string", = "What hypervisor to use?", = ["uhyve", "qemu"], = "qemu" }
= { = "bool", = "Want to enable network?", = true }
prompt
property
The prompt
will be used to display a question / message for this very placeholder on the interactive dialog when using the template.
🤷 What hypervisor to use? [uhyve, qemu] [default: qemu]:
type
property
A placeholder can be of type string
or bool
. Boolean types are usually helpful for conditionally behaviour in templates.
choices
property (optional)
A placeholder can come with a list of choices that the user can choose from. It's further also validated at the time when a user generates a project from a template.
= ["uhyve", "qemu"]
default
property (optional)
A default
property must mach the type (string
| bool
) and is optional. A default should be provided, to ease the interactive process.
As usual the user could press and the default value would simply be taken, it safes time and mental load.
= 'qemu'
regex
property (optional)
A regex
property is a string, that can be used to enforce a certain validation rule. The input dialog will keep repeating
until the user entered something that is allowed by this regex.
Placeholder Examples
An example with a regex that allows only numbers
[]
= { = "string", = "What's your phone number?", = "[0-9]+" }
Default values for placeholders from a file
For automation purposes the user of the template may provide the values for the keys in the template using one or more of the following methods.
NOTE: The methods are listed by falling priority
--define
or -d
flag
The user may specify variables individually using the --define
flag.
--template_values_file
flag
The user of the template may provide a file containing the values for the keys in the template by using the --template-values-file
flag.
NOTE: A relative path will be relative to current working dir, which is not inside the expanding template!
The file should be a toml file containing the following (for the example template provided above):
[]
= "qemu"
= true
Individual values via environment variables
Variables may be specified using environment variables. To do so, set the env var CARGO_GENERATE_VALUE_<variable key>
to the desired value.
:warning: Windows does not support mixed case environment variables. Internally,
cargo-generate
will ensure the variable name is all lowercase. For that reason, it is strongly recommended that template authors only use lowercase variable/placeholder names.
Template values file via environment variable
The user may use the environment variable CARGO_GENERATE_TEMPLATE_VALUES
to specify a file with default values.
For the file format, see above
Default values
Default values may be specified in the config file (specified with the --config
flag, or in the default config file $CARGO_HOME/cargo-generate
)
Example config file:
[]
= "default value"
[]
= "https://github.com/githubusername/mytemplate.git"
[]
= "default value overriding the default"
= "default value for favorite"
Include / Exclude
Templates support a cargo-generate.toml
, with a "template" section that allows you to configure the files that will be processed by cargo-generate
.
The behavior mirrors Cargo's Include / Exclude functionality, which is documented here.
If you are using placeholders in a file name, and also wish to use placeholders in the contents of that file,
you should setup your globs to match on the pre-rename filename.
[]
= ["Cargo.toml"]
# include and exclude are exclusive, if both appear we will use include
= ["*.c"]
The cargo-generate.toml
file should be placed in the root of the template. If using the subfolder
feature, the root is the subfolder
inside the repository, though cargo-generate
will look for the file in all parent folders until it reaches the repository root.
Require cargo-generate
version from template
Using the supported cargo-generate.toml
file, the template author may setup version requirements towards cargo-generate
.
[]
= ">=0.8.0"
The format for the version requirement is documented here.
Cargo gen - alias
cargo gen
requires a cargo alias
to be configured in your $HOME/.cargo/config
like this:
[]
= "generate"
License
Licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.
If you want to contribute to cargo-generate
, please read our CONTRIBUTING notes.