lexers: add git rebase lexer

1 files changed, 50 insertions, 0 deletions

diff --git a/lua/lexers/git-rebase.lua b/lua/lexers/git-rebase.lua
new file mode 100644
index 0000000..b6bcf37
--- /dev/null
+++ b/lua/lexers/git-rebase.lua
@@ -0,0 +1,50 @@
+-- Copyright 2017 Marc André Tanner
+-- git-rebase(1) LPeg lexer.
+
+local l = require('lexer')
+local token, word_match = l.token, l.word_match
+local P, R = lpeg.P, lpeg.R
+
+local M = {_NAME = 'git-rebase'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local comment = token(l.COMMENT, l.starts_line('#') * l.nonnewline^0)
+
+-- Keywords.
+local keywords = l.starts_line(word_match{
+  'p', 'pick',
+  'r', 'reword',
+  'e', 'edit',
+  's', 'squash',
+  'f', 'fixup',
+  'x', 'exec',
+  'd', 'drop',
+  'l', 'label',
+  't', 'reset',
+  'm', 'merge',
+})
+local keyword = token(l.KEYWORD, keywords)
+
+-- Commit SHA1.
+local function patn(pat, min, max)
+  return -pat^(max + 1) * pat^min
+end
+
+local commit = token(l.NUMBER, patn(R('09', 'af'), 7, 40))
+
+local message = token(l.STRING, l.nonnewline^1)
+
+M._rules = {
+  {'whitespace', ws},
+  {'comment', comment},
+  {'keyword', keyword},
+  {'commit', commit},
+  {'message', message},
+}
+
+M._LEXBYLINE = true
+
+return M