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Mill Wrapper Script

❗
 millw is now merged into the official Mill repository.

Small script to automatically fetch and execute mill build tool.

Table of Contents

Installation

On any platform, you can download the millw (Mac / Linux) or millw.bat / millw.ps1 (Windows) scripts found in this repo, into the root of your project. You can then use the script file as a drop-in replacement for Mill.

For convenience on Mac and Linux, use your terminal to navigate to the root of your project, then run the following command:

Shell command to install millw into your project
$ curl -L https://raw.githubusercontent.com/lefou/millw/0.4.12/millw > mill && chmod +x mill

How it works

millw is a small wrapper script around mill and works almost identical to mill. It automatically downloads the correct mill version (into ${XDG_CACHE_HOME}/mill/download or ~/.cache/mill/download on Linux/Mac and $Env:LOCALAPPDATA\mill\download on Windows).

I recommend to rename the tool to just mill. It is designed to be a drop-in replacement for the official mill binary. The project name and also the script name was primarily chosen to be millw to disambiguate references.

The mill version to be used will be determined by the following steps. The search ends, after the first step that results in a version.

  • If the first parameter is --mill-version, the second parameter will be used as the mill version.

    Example
    sh $ mill --mill-version 0.11.6 --disable-ticker version
0.11.6

  • If the environment variable MILL_VERSION is defined, its value will be used.

    Example
    sh $ MILL_VERSION=0.11.6 mill --disable-ticker version
0.11.6

  • If there is a file .mill-version in the working directory, its content will be used as mill version. The file must have only a mill version as content, no additional content or comments are supported.

    Example
    sh $ echo -n "0.11.6" > .mill-version
sh $ mill --disable-ticker version
0.11.6

  • If there is a file .config/mill-version, its content will be used as mill version.

  • The latest mill release available from the Github release pages will be used.

  • If the environment variable DEFAULT_MILL_VERSION is set, its value will be used.

  • The values of the DEFAULT_MILL_VERSION variable inside the script will be used.

Use cases

As mill executable

Istead of installing mill, you can just place the script into you local $HOME/bin directory and rename it to mill.

If you need a special mill version in a project directory, just place a .mill-version file with the best mill version.

Example: setting mill 0.11.6 as best local mill version
sh $ echo -n "0.11.6" > .mill-version

As a wrapper script in your project

To make the start for others easier or to always have the correct mill version in your CI environment[1], you can just place a copy of the script as millw (for Windows millw.bat) in your project root directory.

You should change the DEFAULT_MILL_VERSION variable in that script to the correct version you want to use and add the file under version control.

Add a target to update the millw script with mill

/**
 * Update the millw script.
 */
def millw() = T.command {
  val target = mill.modules.Util.download("https://raw.githubusercontent.com/lefou/millw/main/millw")
  val millw = build.millSourcePath / "millw"
  os.copy.over(target.path, millw)
  os.perms.set(millw, os.perms(millw) + java.nio.file.attribute.PosixFilePermission.OWNER_EXECUTE)
  target
}

GitHub release CDN support

In some areas, the network environment makes downloading files from GitHub release very time-consuming. Fortunately, some CDN services can speed up GitHub release files. You can use the GITHUB_RELEASE_CDN environment variable to add a CDN url prefix before the original GitHub release file url to speed up your file downloads!

License

Published under the Apache Licencse, Version 2.0.

Changelog

millw 0.4.12 - 2024-06-25

  • Introduce a new PowerShell wrapper script.

millw 0.4.11 - 2023-12-18

  • Fixed BSP mode on Windows, due to incorrect MILL_MAIN_CLI variable handling.

millw 0.4.10 - 2023-09-29

  • Fixed unlimited self-calls when the millw script is installed in a location that is also part of the PATH environment variable.

millw 0.4.9 - 2023-09-27

This version has issues if you use it as system-wide installed mill replacement. Please don’t use this version!

  • Improved the logic to use a system-wide installed Mill executable

millw 0.4.8 - 2023-07-25

  • Fixed typo in millw.bat

  • Update fallback Mill version to 0.11.1

millw 0.4.7 - 2023-06-19

  • Download newer Mill versions (0.11.0+) from Maven Central

  • Added support for GITHUB_RELEASE_CDN variable, to speed up downloads

millw 0.4.6 - 2023-01-06

  • Fixed a misplaced newline in millw.bat

millw 0.4.5 - 2022-11-15

  • Fixed issues with running Mill in --repl, --no-server or --bsp mode by preserving the first position of those essential Mill options

millw 0.4.4 - 2022-11-04

  • Feed the currently used mill executable to the Mill process (uses mill.main.cli system property) and support MILL_MAIN_CLI env variable to override the value

millw 0.4.3 - 2022-09-07

  • Support reading the version from local .config/mill-version file

  • Read a DEFAULT_MILL_VERSION env variable before falling back to hardcoded default version

millw 0.4.2 - 2022-02-15

  • Don’t be verbose when system mill version can’t detected

millw 0.4.1 - 2022-02-15

  • Removed bash specifics from shell script

  • Cleaned up shell script

  • Use system-installed mill version if possible

  • Added CI job to run some checks

millw 0.4.0 - 2021-12-22

  • Use curl with --force options to make millw more robust against download errors

millw 0.3.9 - 2021-11-17

  • Use 6 digits for mktemp

  • Fixed download URL for snapshot releases

millw 0.3.8 - 2021-09-17

  • Added support for mill milestones (calculate correct download URL), fixes issues with mill 0.10.0-M2

millw 0.3.7 - 2021-08-26

  • Write messages from the wrapper script to STDERR

millw 0.3.6 - 2021-07-22

  • millw: Support non-GNU touch command, e.g. on BSD and OSX

millw 0.3.5 - 2021-03-01

  • Updated mill repository URLs (mill repo has moved)

  • millw.bat: script exit does not exit the command shell

  • millw.bat: use curl if present, otherwise fall back to bitsadmin

millw 0.3.4 - 2020-10-27

  • millw.bat: Fixed download URL to support snapshot versions of mill

  • millw: Support running/downloading when used with Git Bash under Windows 10

millw 0.3.3 - 2020-07-14

  • millw: Fixed fetching of latest mill version

millw 0.3.2 - 2020-05-09

  • millw.bat: Fixed handling and stripping of --mill-version parameter before calling mill

millw 0.3.1 - 2020-04-10

  • millw.bat: Quote mill command to support directories with spaces

millw 0.3.0 - 2019-12-06

  • Conform to XDG Base Directory Specification (use ~/.cache dir)

millw 0.2.0 - 2019-07-10

  • Print info message before download

  • millw: If no version was given, millw tries to download the latest version

  • Support changed download filename scheme since mill 0.5.0

  • Respect set version from MILL_VERSION environment variable, if defined

millw 0.1.0 - 2019-03-27

  • First release

1. Continuous Integration environment

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Mill Wrapper Script

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