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SMAPI/docs/technical/smapi.md

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← README

This file provides more technical documentation about SMAPI. If you only want to use or create mods, this section isn't relevant to you; see the main README to use or create mods.

This document is about SMAPI itself; see also mod build package and web services.

Contents

Customisation

Configuration file

You can customise some SMAPI behaviour by editing the smapi-internal/config.json file in your game folder. See documentation in the file for more info.

Command-line arguments

The SMAPI installer recognises three command-line arguments:

argument purpose
--install Preselects the install action, skipping the prompt asking what the user wants to do.
--uninstall Preselects the uninstall action, skipping the prompt asking what the user wants to do.
--game-path "path" Specifies the full path to the folder containing the Stardew Valley executable, skipping automatic detection and any prompt to choose a path. If the path is not valid, the installer displays an error.

SMAPI itself recognises two arguments on Windows only, but these are intended for internal use or testing and may change without warning. On Linux/macOS, see environment variables below.

argument purpose
--no-terminal SMAPI won't write anything to the console window. (Messages will still be written to the log file.)
--mods-path The path to search for mods, if not the standard Mods folder. This can be a path relative to the game folder (like --mods-path "Mods (test)") or an absolute path.

Environment variables

The above SMAPI arguments don't work on Linux/macOS due to the way the game launcher works. You can set temporary environment variables instead. For example:

SMAPI_MODS_PATH="Mods (multiplayer)" /path/to/StardewValley

environment variable purpose
SMAPI_NO_TERMINAL Equivalent to --no-terminal above.
SMAPI_MODS_PATH Equivalent to --mods-path above.

Compile flags

SMAPI uses a small number of conditional compilation constants, which you can set by editing the <DefineConstants> element in SMAPI.csproj. Supported constants:

flag purpose
SMAPI_FOR_WINDOWS Whether SMAPI is being compiled for Windows; if not set, the code assumes Linux/macOS. Set automatically in common.targets.

Compile from source code

Main project

Using an official SMAPI release is recommended for most users, but you can compile from source directly if needed. Just open the project in an IDE like Visual Studio or Rider, and build the SMAPI project. The project will automatically adjust the build settings for your current OS and Stardew Valley install path.

Rebuilding the solution in debug mode will copy the SMAPI files into your game folder. Starting the SMAPI project with debugging from Visual Studio or Rider should launch SMAPI with the debugger attached, so you can intercept errors and step through the code being executed.

Custom Harmony build

SMAPI uses a custom build of Harmony, which is included in the build folder. To use a different build, just replace 0Harmony.dll in that folder before compiling.

Prepare a release

On any platform

⚠ Ideally we'd have one set of instructions for all platforms. The instructions in this section will produce a fully functional release for all supported platfrms, except that the application icon for SMAPI on Windows will disappear due to .NET runtime bug 3828. Until that's fixed, see the on Windows section below to create a build that retains the icon.

First-time setup

  1. On Windows only:
    1. Install Windows Subsystem for Linux (WSL).
    2. Run sudo apt update in WSL to update the package list.
    3. The rest of the instructions below should be run in WSL.
  2. Install the required software:
    1. Install the .NET 5 SDK.
      For Ubuntu-based systems, you can run lsb_release -a to get the Ubuntu version number.
    2. Install Steam.
    3. Launch steam and install the game like usual.
    4. Download and install your preferred IDE. For the latest standalone Rider version: 
      wget "<download url here>" -O rider-install.tar.gz
sudo tar -xzvf rider-install.tar.gz -C /opt
ln -s "/opt/JetBrains Rider-<version>/bin/rider.sh"
./rider.sh
  3. Clone the SMAPI repo: 
    git clone https://github.com/Pathoschild/SMAPI.git

Launch the game

  1. Run these commands to start Steam: 
    export TERM=xterm
steam
  2. Launch the game through the Steam UI.

Prepare the release

  1. Run build/unix/set-smapi-version.sh to set the SMAPI version. Make sure you use a semantic version. Recommended format:

    build type format example
    dev build <version>-alpha.<date> 4.0.0-alpha.20251230
    prerelease <version>-beta.<date> 4.0.0-beta.20251230
    release <version> 4.0.0

  2. Run build/unix/prepare-install-package.sh to create the release package in the root bin folder.

On Windows

First-time setup

  1. Set up Windows Subsystem for Linux (WSL):
    1. Install WSL.
    2. Run sudo apt update in WSL to update the package list.
    3. The rest of the instructions below should be run in WSL.
  2. Install the required software:
    1. Install the .NET 5 SDK.
    2. Install Stardew Valley.
  3. Clone the SMAPI repo: 
    git clone https://github.com/Pathoschild/SMAPI.git

Prepare the release

  1. Run build/windows/set-smapi-version.ps1 in PowerShell to set the SMAPI version. Make sure you use a semantic version. Recommended format:

    build type format example
    dev build <version>-alpha.<date> 4.0.0-alpha.20251230
    prerelease <version>-beta.<date> 4.0.0-beta.20251230
    release <version> 4.0.0

  2. Run build/windows/prepare-install-package.ps1 in PowerShell to create the release package folders in the root bin folder.

  3. Launch WSL and run this script:

    # edit to match the build created in steps 1-2
# In WSL, `/mnt/c/example` accesses `C:\example` on the Windows filesystem.
version="4.0.0"
binFolder="/mnt/e/source/_Stardew/SMAPI/bin"
build/windows/finalize-install-package.sh "$version" "$binFolder"

Release notes

See release notes.