run

A simple scripting language for CLI automation. Define functions in a Runfile (or ~/.runfile) and call them from the command line to streamline your development workflow.

Why use run?

It hits a common sweet spot — lightweight, readable, and shell-native for quick CLI automation without the overhead of heavier task systems.

• Simple, familiar syntax for shell users and low onboarding cost.
• Nested names, positional args ($1, $@) and default-value support cover most everyday tasks.
• Multi-line commands, variables, and REPL make iterative development fast.
• Global (~/.runfile) and project-specific (./Runfile) scopes.

What are the alternatives?

• make: More about dependency tracking and rebuilding; heavyweight for simple command orchestration. run is easier for linear scripts and ad-hoc tasks.
• just: Closer in spirit (task runner with recipes). just has richer features (recipe interpolation, shebangs, some safety) while run is simpler and more shell-native.
• Plain shell scripts: More flexible but less discoverable and reusable. run provides a structured, listable command surface.
• Language-based task runners (e.g., npm scripts, Mage): Offer ecosystem hooks and richer logic; run is lighter and language-agnostic.

Prerequisites

• Rust toolchain with Cargo
• Windows users: PowerShell is used by default (pwsh or powershell). You can override this by setting the RUN_SHELL environment variable to use other shells like Git Bash, WSL, or MSYS2.

Installation

Install via crates.io with Cargo:

cargo install devrun

Tab Completions

After installation, enable tab completions for your shell:

run --install-completion  # Auto-detects your shell (bash/zsh/fish)
run --install-completion bash  # Or specify explicitly

Or generate completion scripts manually:

run --generate-completion bash > ~/.local/share/bash-completion/completions/run
run --generate-completion zsh > ~/.zsh/completion/_run
run --generate-completion fish > ~/.config/fish/completions/run.fish

Features

• Simple Function Definitions: Define reusable functions in a Runfile with clean syntax
• Nested Functions: Organise related commands with colon notation (e.g., docker:shell, python:test)
• Argument Passing: Pass arguments to functions using $1, $2, $@, etc.
• Default Values: Set fallback values using bash-style syntax (e.g., ${2:-default})
• Multi-line Commands: Chain commands with && and split across lines with \
• Variable Support: Define and use variables in your scripts
• Interactive REPL: Start an interactive shell for testing commands
• List Functions: Quickly view all available functions with --list
• Global or Project-Specific: Use ~/.runfile for global commands or ./Runfile for project-specific ones

Quick Start

Create a Runfile in your project root:

# Build and run commands
build() cargo build --release
test() cargo test
dev() cargo run

# Docker commands with arguments
docker:shell() docker compose exec $1 bash
docker:logs() docker compose logs -f $1

# Git helpers with multiple arguments
git:commit() git add . && git commit -m "$1" && echo "${2:-Done}"

Run your functions:

run build
run docker shell web
run git commit "Initial commit" "All set!"

Usage

Basic Commands

Call a function from your Runfile:

run build
run test
run lint

Passing Arguments

Functions can accept arguments which are available as $1, $2, $@, etc:

run docker shell app
run git commit "Fix bug" "Completed"
run deploy production us-east-1

Nested Functions

Organise related commands with colon notation and call them with spaces:

run python test      # Calls python:test()
run docker shell web # Calls docker:shell() with "web" as $1
run node dev         # Calls node:dev()

List Available Functions

View all functions defined in your Runfile:

run --list
run -l

Run a Script File

Execute a standalone script file:

run myscript.run

Interactive Mode

Start a REPL to test commands interactively:

run

Runfile Examples

Python (with uv)

python:install() uv venv && uv pip install -r requirements.txt
python:test() uv run pytest
python:lint() uv run ruff check .
python:format() uv run black .

Node.js

node:install() npm install
node:dev() npm run dev
node:build() npm run build
node:lint() npm run lint
node:test() npm test

Docker

docker:build() docker build -t myapp .
docker:run() docker run -it --rm myapp
docker:shell() docker compose exec $1 bash
docker:logs() docker compose logs -f $1
docker:up() docker compose up -d
docker:down() docker compose down

Git Helpers

git:commit() git add . && git commit -m "$1" && echo "${2:-Done}"
git:amend() git commit --amend --no-edit
git:push() git push origin $(git branch --show-current)

Multi-line Functions

deploy() echo "Deploying to $1..." \
    && cargo build --release \
    && scp target/release/app server:/app/ \
    && echo "Deploy complete!"

Using All Arguments

echo_all() echo "All args: $@"
forward() docker exec myapp $@

Runfile Syntax

• Function Definition: name() command or name() command1 && command2
• Nested Functions: category:name() command
• Arguments: Access with $1, $2, $3, etc. or $@ for all arguments
• Default Values: Use bash syntax like ${1:-default_value}
• Multi-line: End lines with \ to continue on the next line
• Comments: Lines starting with # are comments
• Variables: Define with name=value and use with $name

Configuration

Place your Runfile in one of these locations:

• ./Runfile - Project-specific commands (checked first)
• ~/.runfile - Global commands available everywhere

Functions are executed in the underlying shell, so you can use any standard shell syntax, pipes, redirects, etc.

Shell Selection

By default, run uses:

• Windows: PowerShell (pwsh if available, otherwise powershell)
• Unix-like systems: sh

You can override this by setting the RUN_SHELL environment variable:

# Use a different shell temporarily
RUN_SHELL=zsh run build

# Set it for your session (bash/zsh)
export RUN_SHELL=bash

# Set it for your session (PowerShell)
$env:RUN_SHELL = "bash"

# Windows users can use other shells like Git Bash
$env:RUN_SHELL = "bash"
run build

# Or use cmd (syntax in Runfile must be cmd-compatible)
set RUN_SHELL=cmd
run build

This allows you to use any shell you prefer, as long as it supports the -c flag for executing commands.

License

MIT