Git-aware prompt for NYAGOS

git-prompt.lua

set{
  PROMPT='$e[36;40;1m$P$e[37;1m'
}
 
local git_branch = function()
  local path = nyagos.getwd()
  repeat
    if nyagos.access(nyagos.pathjoin(path, '.git'), 0) then
      break
    end
    path = string.match(path, '^(.+)\\')
  until not path
 
  if path then
    local branch = string.match(nyagos.eval('git branch'), '* ([%S ]*)')
    if branch then
        local ref = string.match(branch, '^%(detached from ([0-9a-f]+)%)$')
        if ref then
          return '(' .. ref .. '...)'
        else
          return branch
        end
    else
        return ('no branch')
    end       
  else
    return nil
  end
end
 
local prompt_ = nyagos.prompt
nyagos.prompt = function(prompt)
  local branch = git_branch()
  if branch then
    branch = '$e[33;40;1m(' .. branch .. ')$e[37;1m'
  else
    branch = ''
  end
 
  return prompt_(prompt .. ' ' .. branch .. '$ ')
end