#!/usr/bin/env nu
# Exercise local Git operations in a fresh directory through Wasmtime.
def main [binary: path, --stubs: path] {
  let binary = ($binary | path expand)
  let preloads = if $stubs == null { [] } else {
    glob ($stubs | path join '*.wasm') | each {|p| ['--preload' $'($p | path parse | get stem)=($p)'] } | flatten
  }
  let root = (^mktemp -d /tmp/s3-git/local.XXXXXX | str trim)
  let repo = ($root | path join repo)
  mkdir $repo
  def --wrapped g [...args: string] {
    print $'git ($args | str join " ")'
    ^wasmtime run ...$preloads --dir /tmp/s3-git/dev::/dev --dir $'($root)::/repo' --env GIT_PAGER=cat --env GIT_EDITOR=true --env GIT_AUTHOR_NAME=Spike --env GIT_AUTHOR_EMAIL=spike@example.invalid --env GIT_COMMITTER_NAME=Spike --env GIT_COMMITTER_EMAIL=spike@example.invalid --env GIT_CONFIG_NOSYSTEM=1 --env HOME=/repo -- $binary -C /repo/repo -c core.pager=cat -c maintenance.auto=false -c commit.gpgsign=false ...$args
    if $env.LAST_EXIT_CODE != 0 { error make {msg: $'Git failed: ($args | str join " ")'} }
  }
  g init -b main
  'base' | save ($repo | path join base)
  g add base
  g commit -m base
  g status --short
  g log --oneline
  g branch feature
  g switch feature
  'feature' | save ($repo | path join feature)
  g add feature
  g commit -m feature
  g switch main
  g merge --ff-only feature
  g branch side
  'main' | save ($repo | path join main)
  g add main
  g commit -m main
  g switch side
  'side' | save ($repo | path join side)
  g add side
  g commit -m side
  g switch main
  g merge --no-edit side
  'changed' | save --force ($repo | path join base)
  g diff
  g worktree add -b linked /repo/linked
  if not ($root | path join linked side | path exists) { error make {msg: 'Missing worktree file'} }
  print $'PASS: local operations in ($root)'
}