Derry is a script manager for Dart.
Derry helps you define shortcut scripts, and save you from having to type very long and forgettable long lines of scripts, again and again.
Instead of running this every time,
dart run build_runner build --delete-conflicting-outputs
Add this to
scripts: build: dart run build_runner build --delete-conflicting-outputs
Install derry as a global dependency from pub.dev like this.
dart pub global activate derry
Then use derry to run a command from the current dart/flutter project.
When called, derry will look for a
pubspec.yaml file in the current directory, and will throw an error if it doesn't exist. The scripts can be declared within the
scripts node of the
scripts: build: dart run build_runner build
derry build # or even with additional arguments derry build -- --delete-conflicting-outputs
Use definition file
Scripts can be configured just inside the
pubspec.yaml file or within a separate file. When using a separate file to configure scripts, pass the file name as the value of the
scripts node in the
# pubspec.yaml scripts: derry.yaml
# derry.yaml build: dart run build_runner build
Use scripts as List
A script can either be a single string or a list of strings. If it is a list, the strings inside of the list will be executed synchronously in the given order of the list.
build: - dart test - echo "test completed" - dart run build_runner build
Scripts can be nested as the user needed. For example, you can use them to use different implementations of the build script based on operating system.
build: windows: - echo 0 # do something mac: - echo 1 # do something else
And you can use them by calling
derry build windows on windows and
derry build mac on macOS.
Pre and post scripts
With pre & post scripts, you can easily define a script to run before and after a specific script without hassling with references. Derry automatically understands them from the names.
prepublish: - cargo build && copy target blob - dart test publish: - dart pub publish postpublish: - rm -rf blob
Configure script descriptions
You can add a string to
(description) option, which can be useful when viewing through a list of available via
derry ls -d command. When you are using
(description) field, you must use
(script) field to define scripts.
build: (description): script to be called after every update to x.dart file (scripts): - cat generated.txt - dart run build_runner build
Configure multiline scripts
Note that in the list of scripts, executions will happen in separate processes. You can use
&& to execute multiple scripts in the same process.
# > or | can be used to define multiline strings, this is a standard YAML syntax build: > cat generated.txt && dart run build_runner build # the second line won't be called if generated.txt does not exist
When defining scripts, you can reference to other scripts via
$ syntax. These references to scripts won't be executed with a separate derry process. For example,
test: - dart run test - echo "test completed" build: - $test # instead of using derry test - $test --ignored # even with arguments - flutter build generate: env: - echo env release: - $generate:env # use nested references via : - $build
derry test will spawn a new derry process to execute, while references won't, reducing the time took to run dart code, and spawn that process.
But note that references will take a whole line of script. For example, you have to give a separate line for a subcommand, you can't use them together with other scripts or sandwiched in a string.
List available scripts
Use this command to see what scripts are available in the current configuration.
derry ls # --description or -d to output descriptions
Check the location of the derry scripts
Use this command to see the location (both absolute and relative) path of the derry script file. You can also use this to check if the scripts are correctly formatted or the location is correct.
derry source # --absolute or -a to show absolute path
dart pub global activate derry # or derry upgrade # will run `dart pub global activate derry`
Why & How
Honestly, I needed it. It was easy to make, though I had a hard time implementing the script execution. Since Dart's
Process isn't good at executing system commands, I used Rust with the help of Foreign Function Interfaces. For execution, currently
cmd is used for Windows and
bash is used for Linux and Mac.
Currently Supported Platforms
64bit Linux, Windows, and Mac are currently supported.