lua/lexers/git-rebase.lua

   1 -- Copyright 2017-2021 Marc André Tanner
   2 -- git-rebase(1) LPeg lexer.
   3
   4 local l = require('lexer')
   5 local token, word_match = l.token, l.word_match
   6 local P, R = lpeg.P, lpeg.R
   7
   8 local M = {_NAME = 'git-rebase'}
   9
  10 -- Whitespace.
  11 local ws = token(l.WHITESPACE, l.space^1)
  12
  13 -- Comments.
  14 local comment = token(l.COMMENT, l.starts_line('#') * l.nonnewline^0)
  15
  16 -- Keywords.
  17 local keywords = l.starts_line(word_match{
  18   'p', 'pick',
  19   'r', 'reword',
  20   'e', 'edit',
  21   's', 'squash',
  22   'f', 'fixup',
  23   'x', 'exec',
  24   'd', 'drop',
  25   'b', 'break',
  26   'l', 'label',
  27   't', 'reset',
  28   'm', 'merge',
  29 })
  30 local keyword = token(l.KEYWORD, keywords)
  31
  32 -- Commit SHA1.
  33 local function patn(pat, min, max)
  34   return -pat^(max + 1) * pat^min
  35 end
  36
  37 local commit = token(l.NUMBER, patn(R('09', 'af'), 7, 40))
  38
  39 local message = token(l.STRING, l.nonnewline^1)
  40
  41 M._rules = {
  42   {'whitespace', ws},
  43   {'comment', comment},
  44   {'keyword', keyword},
  45   {'commit', commit},
  46   {'message', message},
  47 }
  48
  49 M._LEXBYLINE = true
  50
  51 return M