fakegit

fakegit is a dummy subset of git, meant to serve as demo of how you can use github.com/ucarion/cli to build rich CLI tools with options, subcommands, man pages, and autocompletion. Also included is a working Homebrew recipe for fakegit, which you can use as a starting point to make Homebrew recipes for your own tools.

Installing fakegit

Shipping CLI tools to end users can be tricky; if you're not intimiately familiar with how shells and Unix and really work, it can feel like a bit of a lost art. This repo includes a set of GitHub actions that compiles fakegit on every push, and generates a new set of macOS, Linux, and Windows binaries on every tag. You can use these GitHub actions as a starting point in your own projects.

To install fakegit on macOS, you can run:

brew install ucarion/fakegit/fakegit

(The Homebrew "tap" for fakegit lives in github.com/ucarion/homebrew-fakegit).

To install fakegit on Linux or Windows, you can download the latest release build, and then place the fakegit binary within to your PATH. On Linux, you can additionally install the man pages (they have the file extention .1) to your MANPATH, and to set up Bash/Zsh autocompletion you can run (or add to your bashrc/zshrc):

complete -o bashdefault -o default -C fakegit fakegit

To verify the installation, you can run:

fakegit --version

And, on macOS or Linux:

man fakegit

Using fakegit

This section is about how to use the fakegit tool in this repo by compiling and running the tool from source. If you plan on using github.com/ucarion/cli in your project, you'll probably have a similar developer experience when hacking on your project.

Running fakegit

To build fakegit, you just need make and a working Go toolchain. Then, run make build/fakegit to compile fakegit, which you can then run as ./build/fakegit.

fakegit has essentially no functionality; all it does is print the options you gave it. For instance, if you run:

make build/fakegit
./build/fakegit --bare status --verbose x y z | jq

You'll get as output:

{
  "RootArgs": {
    "Version": false,
    "Paginate": false,
    "Bare": true,
    "GitDir": ""
  },
  "Verbose": true,
  "Short": false,
  "Pathspecs": [
    "x",
    "y",
    "z"
  ]
}

However, one piece of functionality is implemented. If you pass --version to fakegit, it will print the version of the tool you installed:

./build/fakegit --version

v0.1.14

This is included to show how you can have version information in your CLI tool; github.com/ucarion/cli does not try to understand versions at all; instead, fakegit injects a version from version control using git describe --tags and go build -ldflags; see the Makefile recipe for build/fakegit, as well as cmd/fakegit/root.go, to see how that happens.

Building and viewing the man pages

To build the fakegit man pages, run:

make fakegit_man

Man pages for CLI tools have a file extention of .1. You can view the generated man pages by running (for example):

man ./build/fakegit.1

Each subcommand gets its own man page.

Setting up local Bash/Zsh autocompletion

To set up Bash or Zsh autocompletion for your locally-built fakegit, run:

source fakegit_completion.sh

Then, you should be able to run:

# Don't actually type out <TAB>; press on the TAB key on your keyboard.
./build/fakegit <TAB>

--bare      --git-dir   --paginate  --version   commit      remote      status

ucarion / fakegit