[#20] Write README (#51)

Resolves #20

Author: chshersh

.github/workflows/rust.yml .github/workflows/ci.yml.github/workflows/rust.yml renamed to .github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Rust
+name: CI
 
 on:
   pull_request:
@@ -64,7 +64,7 @@ jobs:
           }
 
     - if: matrix.os != 'windows-latest'
-      name: "Integration test: [full-database]"
+      name: "Integration test: [unix] [full-database]"
       env:
           SYNC_DIR: "full-database"
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -1,2 +1,264 @@
 # tool-sync
-🧰 Manage your personal toolbox easily
+
+[![GitHub CI](https://github.com/chshersh/tool-sync/workflows/CI/badge.svg)](https://github.com/chshersh/tool-sync/actions)
+[![Latest GitHub release](https://img.shields.io/github/v/release/chshersh/tool-sync)](https://github.com/chshersh/tool-sync/releases/latest)
+[![MPL-2.0 license](https://img.shields.io/badge/license-MPL--2.0-blue.svg)](LICENSE)
+
+`tool-sync` is a CLI tool for installing your other favourite tools from GitHub Releases.
+
+![tool-sync demo](./images/demo.gif)
+
+> ℹ️ **DISCLAIMER:** `tool-sync` is developed and maintained in free time
+> by volunteers. The development may continue for decades or may stop
+> tomorrow. You can use
+> [GitHub Sponsorship](https://github.com/sponsors/chshersh) to support
+> the development of this project.
+
+## What it really does?
+
+`tool-sync` embraces the idea that configuring your personal development
+environment should be as easy as possible. And the life is pretty easy when all
+the tools are simple executables.
+
+**So why not simply download all executables you use and put them in one place???** 😱
+
+With `tool-sync`, you can install all the tools you use by following three
+simple steps:
+
+1. [Install `tool-sync`](#install).
+2. [Configure](#configure) `tool-sync` by listing all the tools you need and
+   specifying where to put them.
+3. Run `tool sync`.
+
+That's all! 🥳
+
+Then `tool-sync` does the following:
+
+* Fetches the information about tools from GitHub Releases
+* Automatically guesses the asset name from your OS for common tools
+* Downloads and unpacks assets
+* Copies binaries from unpacked assets to the location of your choice
+
+## Features
+
+`tool-sync` has several distinguished features that allows you to manage your
+personal toolbox easily:
+
+* Installs the latest version of tools by default. You can easily update all
+  your tools with a single command!
+* Supports common tools that you can easily install without extra configuration
+* Automatically guesses asset name from your current OS
+* Configures via a simple TOML file
+
+## Install
+
+### From releases (recommended)
+
+You can install `tool-sync` directly from GitHub releases in a few steps:
+
+1. Go to the [latest release](https://github.com/chshersh/tool-sync/releases/latest).
+2. Download an asset for your OS.
+3. Unpack the `tool` executable to a desired location.
+
+<!-- Good news, you only need to do this once! `tool-sync` will manage future
+installations of itself (if you add it to your config). -->
+
+### From crates
+
+You can use `cargo` to install the latest published version of `tool-sync` from crates:
+
+```shell
+cargo install tool-sync
+```
+
+### From sources
+
+You can install the latest version of `tool-sync` from sources (requires `git`
+and `cargo`):
+
+```shell
+git clone https://github.com/chshersh/tool-sync
+cd tool-sync
+cargo build --release
+./target/release/tool --version
+```
+
+## Configure
+
+`tool-sync` reads configuration from a file in TOML format. An example
+configuration file is shown below:
+
+```toml
+# a directory to store all tools
+store_directory = "~/.local/bin"
+
+# the following tools will be installed in 'store_directory'
+[bat]
+[difftastic]
+[exa]
+[fd]
+[ripgrep]
+```
+
+By default `tool-sync` reads configuration from `~/.tool.toml` but you can put
+the content in any place and specify the path via the `--config` flag.
+
+You can also quickly copy the above configuration to the default path by running
+the following command (Unix-only):
+
+```shell
+curl https://raw.githubusercontent.com/chshersh/tool-sync/main/example-tool-sync-config.toml > ~/.tool.toml
+```
+
+The above example config lists some tools natively supported by `tool-sync` and
+therefore they don't require extra configuration.
+
+To specify a tool not supported by `tool-sync`, add a TOML table entry and list
+all the required fields like in the example below:
+
+```toml
+[tokei]
+owner    = "XAMPPRocky"  # GitHub username
+repo     = "tokei"       # GitHub repository
+exe_name = "tokei"       # Executable name inside the asset
+
+# Asset name to download on linux OSes
+asset_name.linux = "x86_64-unknown-linux-musl"
+
+# uncomment if you want to install on macOS as well
+# asset_name.macos = "apple-darwin"
+
+# uncomment if you want to install on Windows as well
+# asset_name.windows = "x86_64-pc-windows-msvc"
+```
+
+> ℹ️ `tool-sync` searches asset name using the _substring search_. That's why
+> you don't need to specify the full asset name in the config, only the minimal
+> part required for identifying the asset. However, `tool-sync` doesn't guarantee
+> you to find the asset you need if multiple assets from the GitHub release match
+> the substring.
+
+All fields in each tool section are
+
++ **required for unknown tools,**
++ _optional for known tools._
+
+This means that you can override only some of the fields for known tools.
+
+This can be helpful if e.g. you want to install a custom version of `ripgrep`
+from a forked repository. To do this, specify only the repository owner in the
+config:
+
+```toml
+[ripgrep]
+owner = "me"
+```
+
+## Usage
+
+Install all the tools specified in `~/.tool.toml`:
+
+```shell
+tool sync
+```
+
+Install all the tools from config in a different location:
+
+```shell
+tool --config=path/to/my/config.toml sync
+```
+
+Run `tool --help` for more details.
+
+> :octocat: If you hit the limit for downloading assets or want to download
+> assets from private repositories, 
+> [create a personal access token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token)
+> and export it as the `GITHUB_TOKEN` environment variable.
+
+## Alternatives
+
+This section contains `tool-sync` comparison to existing alternatives:
+
+1. **Manual download**. You can download GitHub releases manually without using
+   any extra tools.
+   
+   + **Pros**
+     + No extra tools required, only your browser and unpack utility
+   + **Cons**
+     + Tedious manual process
+
+2. **GitHub CLI**. You can download assets from releases using 
+   [the GitHub CLI tool `gh`][gh].
+
+   ```shell
+   gh release download --repo chshersh/tool-sync v0.0.0 --pattern='*linux*'
+   tar -xvf tool-x86_64-unknown-linux-gnu.tar.gz
+   ./tool --version
+   ```
+
+   + **Pros**
+     + Using a more common tool (that you probably have)
+   + **Cons**
+     + Can't download multiple tools with a single command
+     + Can't guess the asset name by your OS
+
+3. [**dra**][dra]. `dra` is the closest alternative to `tool-sync`. It's a CLI
+   tool, written in Rust, that allows downloading individual releases easily.
+
+   + **Pros**
+     + Convenient interface for downloading a single release
+   + **Cons**
+     + Can't download multiple tools with a single command
+     + Can't guess the asset name by your OS
+
+4. [**home-manager**][home-manager]. Home Manager provides a full-features
+   solution for managing a user environment using the Nix package manager.
+
+   + **Pros**
+     + Supports more than downloading tools from GitHub Releases
+     + Access to the bigger Nix ecosystem
+   + **Cons**
+     + More complicated solution
+     + Requires learning and using Nix
+
+[gh]: https://github.com/cli/cli
+[dra]: https://github.com/devmatteini/dra
+[home-manager]: https://github.com/nix-community/home-manager
+
+## For contributors
+
+Check [CONTRIBUTING.md](https://github.com/chshersh/tool-sync/blob/main/CONTRIBUTING.md)
+for contributing guidelines.
+
+## Development
+
+### Build
+
+Use `cargo` to build the project and run all tests:
+
+```shell
+cargo build
+cargo test
+```
+
+### Adding a new tool
+
+`tool-sync` contains [a database of common tools][db] and provides easier
+support for them. It's possible to add more tools (and you can suggest them!).
+The following list contains guidelines for including a new tool. They don't
+serve as gatekeeping criteria but more as points system:
+
+* 6 months passed since the tool release
+    + So that the database won't be populated with fresh tools that are never
+      supported
+* At least 3 releases
+    + To ensure stable naming scheme for assets
+* Commonly used tool
+    + `tool-sync` strives to be generic so it might not want to support a DNA
+      analysis CLI tool which is useful only for a specific group
+* The `tool-sync` author find the tool helpful
+    + In the end, there're people behind `tool-sync` who maintain this project
+      while the rest of the world benefits from it for free. At least, `tool-sync`
+      authors decide what they want to use and whether they want to support a tool indefinitely.
+
+[db]: https://github.com/chshersh/tool-sync/blob/main/src/sync/db.rs