vis: add config

1 files changed, 32 insertions, 0 deletions

diff --git a/.config/vis/lexers/roff.lua b/.config/vis/lexers/roff.lua
new file mode 100644
index 0000000..59657a7
--- /dev/null
+++ b/.config/vis/lexers/roff.lua
@@ -0,0 +1,32 @@
+-- Copyright 2023 Sam Nystrom <sam@samnystrom.dev>
+-- Roff LPeg lexer.
+
+local l = require('lexer')
+local token, word_match = l.token, l.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local M = {_NAME = 'roff'}
+
+-- Whitespace
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments
+local comment = token(l.COMMENT, '\\"' * l.nonnewline^0)
+
+-- Strings
+local string = token(l.STRING, l.delimited_range('"'))
+
+-- Keywords
+local word = (l.alpha + '_') * (l.alnum + S('_.'))^0
+local keyword = token(l.KEYWORD, l.starts_line('.') * l.word)
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'string', string},
+  {'comment', comment},
+}
+
+M._LEXBYLINE = true
+
+return M