This package adds YAML syntax checker yamllint. Make sure 'yamllint' binary is on your path. Installation instructions https://github.com/adrienverge/yamllint#installation flymake-yamllint expect `yamllint' to produce stdout like: test.yml:2:4: [error] wrong indentation: expected 2 but found 3 (indentation) Example above should be matched by regex used in code like this: 0: stdin:79:81: [warning] line too long (117 > 80 characters) (line-length) 1: 79 2: 81 3: [warning] 4: line too long (117 > 80 characters) (line-length) SPDX-License-Identifier: GPL-3.0-or-later flymake-yamllint is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. flymake-yamllint is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with flymake-yamllint. If not, see http://www.gnu.org/licenses.