---
layout: layouts/base.njk
permalink: /
---

<hgroup>
  <h1>Taskfile Build</h1>
  <p>Run any project.</p>
</hgroup>

[![.forgejo/workflows/build.yml](https://codeberg.org/Mint-System/taskfile.build/badges/workflows/build.yml/badge.svg)](https://codeberg.org/Mint-System/taskfile.build/actions?workflow=build.yml)

---

The task file is a simple bash script and standardized interface for any software project.

It is to be understood as a software development pattern to standardize the installation, configuration and execution of different software frameworks.

- 🛠️ **Configuration**: Install and configure software and tools with ease.
- 🐳 **Docker Build**: Build and publish Docker images for your project.
- 🔑 **KeePass / Pass**: Store and load secrets from KeePass and pass.
- 📄 **.env / dotenv**: Manage multiple dotenv files for your projects.
- 🔄 **CI Pipelines**: Simplify CI pipelines by making the executed task reproducible.
- 📚 **Library commands**: A collection of reusable commands for common scripting tasks.

## Specification

The specification is a short guide to set up a task file for a Python project.

Create a file `task` in your project.

```bash
touch task
```

Ensure it is executable.

```bash
chmod +x task
```

First add the bash shebang.

```bash
#!/usr/bin/env bash
```

Then append the abort on error setting.

```bash
set -e
```

Next add the dynamic width help table function.

```bash
help-table() {
    local -a rows
    local max_cmd=7 max_opt=6 max_desc=11

    rows+=("Command|Option|Description")
    rows+=("help|[grep]|Show help for commands.")
    rows+=("install||Install build dependencies.")
    rows+=("lint||Run pre-commit.")
    rows+=("version||Show version of required tools.")

     for row in "${rows[@]}"; do
        IFS='|' read -r cmd opt desc <<< "$row"
        (( ${#cmd} > max_cmd )) && max_cmd=${#cmd}
        (( ${#opt} > max_opt )) && max_opt=${#opt}
        (( ${#desc} > max_desc )) && max_desc=${#desc}
    done

    printf '| %-*s | %-*s | %-*s |\n' \
        "$max_cmd" "Command" \
        "$max_opt" "Option" \
        "$max_desc" "Description"

    printf '|-%*s-|-%*s-|-%*s-|\n' \
        "$max_cmd" "$(printf '%*s' "$max_cmd" '' | tr ' ' '-')" \
        "$max_opt" "$(printf '%*s' "$max_opt" '' | tr ' ' '-')" \
        "$max_desc" "$(printf '%*s' "$max_desc" '' | tr ' ' '-')"

    local first_row=true
    for row in "${rows[@]:1}"; do
        IFS='|' read -r cmd opt desc <<< "$row"
        if [[ "$cmd" =~ ^===.*===$ ]]; then
            group_name="${cmd/===/}"
            group_name="${group_name/===/}"

            if [ "$first_row" = true ]; then
                first_row=false
            else
                printf '|-%*s-|-%*s-|-%*s-|\n' \
                    "$max_cmd" "$(printf '%*s' "$max_cmd" '' | tr ' ' '-')" \
                    "$max_opt" "$(printf '%*s' "$max_opt" '' | tr ' ' '-')" \
                    "$max_desc" "$(printf '%*s' "$max_desc" '' | tr ' ' '-')"
            fi

            local left_pad=$(( (max_cmd - ${#group_name}) / 2 ))
            local right_pad=$(( max_cmd - left_pad - ${#group_name} ))
            printf '| %*s%s%*s | %*s | %*s |\n' \
                "$left_pad" "" \
                "$group_name" \
                "$right_pad" "" \
                "$max_opt" "" \
                "$max_desc" ""

            printf '|-%*s-|-%*s-|-%*s-|\n' \
                "$max_cmd" "$(printf '%*s' "$max_cmd" '' | tr ' ' '-')" \
                "$max_opt" "$(printf '%*s' "$max_opt" '' | tr ' ' '-')" \
                "$max_desc" "$(printf '%*s' "$max_desc" '' | tr ' ' '-')"
        else
            first_row=false
            printf '| %-*s | %-*s | %-*s |\n' \
                "$max_cmd" "$cmd" \
                "$max_opt" "$opt" \
                "$max_desc" "$desc"
        fi
    done
}
```

And the help function that shows and filters the table.

```bash
help() {
    local grep_pattern
    echo
    if [[ -n "$1" ]]; then
        grep_pattern="$1"
        help-table | grep -i "$grep_pattern" | column -t -s'|'
    else
        echo 'task <command> [options]'
        echo
        echo 'commands:'
        echo
        help-table
    fi
    echo
}
```

Implement the actual command functions.

```bash
install() {
    echo 'Setup venv and install Python dependencies'
    uv venv
    source .venv/bin/activate
    uv pip install pre-commit
}

lint() {
    source .venv/bin/activate

    echo 'Run pre-commit'
    pre-commit run --all-file
}

version() {
    uv --version
}
```

Finish the task file with command switch cases.

```bash
if [[ "$1" == *","* ]]; then
    # Split comma-separated commands
    IFS=',' read -ra COMMANDS <<< "$1"
    for cmd in "${COMMANDS[@]}"; do
        # Trim whitespace
        cmd=$(echo "$cmd" | xargs)
        if declare -f "$cmd" > /dev/null; then
            "$cmd"
        else
            echo "Unknown command: $1"
            help "$@"
            exit 1
        fi
    done
elif declare -f "$1" > /dev/null; then
    "$1" "${@:2}"
else
    case "$1" in
        all)
            install
            lint
            ;;
        *)
            echo "Unknown command: $1"
            help
            exit 1
            ;;
    esac
fi
```

These are the main parts of every task file script.

Now see [usage](/usage) on how to use the task file.

## Development

Checkout the [development](/development) page for details.