Nyagos リポジトリブランチ名表示 プロンプトの一例 ref: http://qiita.com/tsuyoshi_cho/items/d029825b6d8d3688da92

.nyagos

-- comment

-- prompt
-- 関数定義がうまくいかないので、クロージャ内のローカル関数にする
nyagos.prompt = function(this)
    ------------------------------------------------
    -- strをpatで分割しテーブルを返す
    -- code from 'http://lua-users.org/wiki/SplitJoin'
    local function split(str, pat)
        local t = {}  -- NOTE: use {n = 0} in Lua-5.0
        local fpat = "(.-)" .. pat
        local last_end = 1
        local s, e, cap = str:find(fpat, 1)
        while s do
            if s ~= 1 or cap ~= "" then
                table.insert(t, cap)
            end
            last_end = e+1
            s, e, cap = str:find(fpat, last_end)
        end
        if last_end <= #str then
            cap = str:sub(last_end)
            table.insert(t, cap)
        end
        return t
    end
    ------------------------------------------------
    -- srcの末尾から改行を取り除く
    local function chomp(src)
        return string.gsub(src, "[\r\n]+$", "")
    end
    ------------------------------------------------
    -- 最下層nのディレクトリ名だけ表示する文字列生成
    -- fix nyagos 4.0x api
    local function getCompressedPath(num)
        local wd = nyagos.getwd()
        local env = nyagos.env
        local path = chomp(wd)
        local buff = path

        local drive = nil

        -- HOME以下の場合
        local home = env.home or env.userprofile
        if path:find(home)then
            drive = '~'
            path = path:gsub(home, '~')
            buff = path
        end
        -- 通常のドライブ
        if drive == nil then
            drive = buff:match('(%w+:)\\')
            buff = buff:gsub('%w+:\\', '')
        end
        -- UNCパス
        if drive == nil then
            drive = buff:match('(\\\\.-)\\')
            buff = buff:gsub('\\\\.-\\', '')
        end

        local tbl = split(buff, "[\\/]")
        if #tbl > num then
            buff = "/..."
            for i = #tbl - (num - 1), #tbl do
                buff = buff .. '/' .. tbl[i]
            end
                path = drive .. buff
        end

        return path
    end
    ------------------------------------------------
    -- エスケープシーケンスを削除
    local function removeEscapeSequence(src)
        -- FIXME : なぜか'$e%[(%d+;)+1m'でマッチしない
        return src:gsub('$e%[%d+;%d+;1m',''):gsub('$e%[%d+;1m','')
    end
    ------------------------------------------------
    -- 文字列の幅を取得
    -- 半角文字:1, 全角文字:2 にカウント
    local function getStringWidth(src)
      local width = 0
      for p, c in utf8.codes(src) do
          if (0 ~= bit32.band(c, 0x7FFFFF80)) then
              if (0xFF61 <= c and c <= 0xFF9F) then
                  width = width + 1
              else
                  width = width + 2
              end
          else
              width = width + 1
          end
      end
      return width
    end
    ------------------------------------------------
    -- PROMPT生成部分
    -- branch name append
    local function makePrompt(pathBlock)
        local prompt  = ''
        if (pathBlock ~= '') then
            prompt = pathBlock
        else
            prompt = '$e[30;40;1m[' .. getCompressedPath(3):gsub('\\', '/') .. ']$e[37;1m'
        end
        local hgbranch = nyagos.eval('hg branch 2> nul')
        local gitbranch = nyagos.eval('git rev-parse --abbrev-ref HEAD 2> nul')
        local rprompt = ''
        if (hgbranch ~= '') then
            rprompt = rprompt .. '$e[30;40;1m[$e[33;40;1m' .. hgbranch .. '$e[30;40;1m]$e[37;1m'
        end
        if (gitbranch ~= '') then
            rprompt = rprompt .. '$e[30;40;1m[$e[33;40;1m' .. gitbranch .. '$e[30;40;1m]$e[37;1m'
        end
        local pad = nyagos.getviewwidth() - getStringWidth(removeEscapeSequence(prompt .. rprompt))
        for i = 1, pad-1 do
            prompt = prompt .. ' '
        end
        return prompt .. rprompt .. '\n$ '
    end
    ------------------------------------------------

    -- path,title,prompt
    local path = getCompressedPath(3):gsub('\\', '/')
    local title = ''

    local pathBlock = ''
    if nyagos.elevated() then
        title = path .. " - NYAGOS(admin)"
        pathBlock = '$e[30;40;1m[$e[40;31;1m'..path..'$e[30;40;1m]$e[37;1m'
    else
        title = path .. " - NYAGOS"
        pathBlock = '$e[30;40;1m[$e[40;36;1m'..path..'$e[30;40;1m]$e[37;1m'
    end

    return nyagos.default_prompt(makePrompt(pathBlock),title)
end
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