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diff --git a/lua/lexers/output.lua b/lua/lexers/output.lua
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+-- Copyright 2022-2024 Mitchell. See LICENSE.
+-- LPeg lexer for tool output.
+-- If a warning or error is recognized, tags its filename, line, column (if available),
+-- and message, and sets the line state to 1 for an error (first bit), and 2 for a warning
+-- (second bit).
+-- This is similar to Lexilla's errorlist lexer.
+
+local lexer = lexer
+local starts_line = lexer.starts_line
+local P, S = lpeg.P, lpeg.S
+
+local lex = lexer.new(..., {lex_by_line = true})
+
+-- Tags a pattern as plain text.
+local function text(patt) return lex:tag(lexer.DEFAULT, patt) end
+
+-- Tags a pattern as a filename.
+local function filename(patt) return lex:tag('filename', patt) end
+
+-- Typical line and column number patterns.
+local line = text('line ')^-1 * lex:tag('line', lexer.dec_num)
+local column = lex:tag('column', lexer.dec_num)
+
+-- Tags a pattern as an error/warning/etc. message.
+local function message(patt) return lex:tag('message', patt) end
+
+-- Immediately marks the current line as an error.
+-- This should only be specified at the end of a rule, or else LPeg may backtrack and mistakenly
+-- mark a non-error line.
+local function mark_error(_, pos)
+  lexer.line_state[lexer.line_from_position(pos)] = 1
+  return true
+end
+
+-- Immediately marks the current line as a warning.
+-- This should only be specified at the end of a rule, or else LPeg may backtrack and mistakenly
+-- mark a non-warning line.
+local function mark_warning(_, pos)
+  lexer.line_state[lexer.line_from_position(pos)] = 2
+  return true
+end
+
+-- filename:line: message (ruby)
+-- filename:line:col: message (c, cpp, go, ...)
+-- filename: line X: message (bash)
+local c_filename = filename((lexer.nonnewline - ':')^1)
+local colon = text(':' * P(' ')^-1)
+local warning = message(lexer.to_eol('warning: ')) * mark_warning
+local note = message(lexer.to_eol('note: ')) -- do not mark
+local error = message(lexer.to_eol()) * mark_error
+lex:add_rule('common', starts_line(c_filename) * colon * line * colon * (column * colon)^-1 *
+  (warning + note + error))
+
+-- prog: filename:line: message (awk, lua)
+lex:add_rule('prog', starts_line(text(lexer.word)) * colon * c_filename * colon * line * colon *
+  (warning + error))
+
+-- File "filename", line X (python)
+local py_filename = filename((lexer.nonnewline - '"')^1)
+lex:add_rule('python',
+  starts_line(text('File "'), true) * py_filename * text('", ') * line * mark_error)
+
+-- filename(line): error: message (d, cuda)
+local lparen, rparen = text('('), text(')')
+local d_filename = filename((lexer.nonnewline - '(')^1)
+local d_error = message(lexer.to_eol(S('Ee') * 'rror')) * mark_error
+lex:add_rule('dmd', starts_line(d_filename) * lparen * line * rparen * colon * d_error)
+
+-- "filename" line X: message (gnuplot)
+local gp_filename = filename((lexer.nonnewline - '"')^1)
+lex:add_rule('gnuplot', starts_line(text('"')) * gp_filename * text('" ') * line * colon * error)
+
+-- at com.path(filename:line) (java)
+lex:add_rule('java',
+  starts_line(text('at ' * (lexer.nonnewline - '(')^1), true) * lparen * c_filename * colon * line *
+    rparen * mark_error)
+
+-- message in filename on line X (php)
+lex:add_rule('php', starts_line(message((lexer.nonnewline - ' in ')^1)) * text(' in ') *
+  filename((lexer.nonnewline - ' on ')^1) * text(' on ') * line * mark_error)
+
+-- filename(line, col): message (vb, csharp, fsharp, ...)
+lex:add_rule('vb',
+  starts_line(filename((lexer.nonnewline - '(')^1)) * lparen * line * text(', ') * column * rparen *
+    colon * error)
+
+-- message at filename line X (perl)
+lex:add_rule('perl', starts_line(message((lexer.nonnewline - ' at ')^1)) * text(' at ') *
+  filename((lexer.nonnewline - ' line ')^1) * text(' line ') * line * mark_error)
+
+-- CMake Error at filename:line: (cmake)
+lex:add_rule('cmake',
+  starts_line(text('CMake Error at ')) * c_filename * colon * line * colon * mark_error)
+
+lex:add_rule('any_line', lex:tag(lexer.DEFAULT, lexer.to_eol()))
+
+return lex