Initial commit

LICENSE

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+ Copyright (c) 2022 Alexander Heinrich
+
+ Permission is hereby granted, free of charge, to any person obtaining a
+ copy of this software and associated documentation files (the "Software"),
+ to deal in the Software without restriction, including without limitation
+ the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ and/or sell copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.

README.md

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+Provides a [bean-check](https://github.com/beancount/beancount) diagnostic source for
+[null-ls.nvim](https://github.com/jose-elias-alvarez/null-ls.nvim). This source will lint your
+beancount files every time you save them.
+
+## Dependencies
+
+* [vim-beancount](https://github.com/nathangrigg/vim-beancount) for filetype detection
+
+## Setup
+
+```lua
+require('null-ls').register(require('null-ls-bean-check'))
+```

lua/null-ls-bean-check.lua

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+local helpers = require('null-ls.helpers')
+return {
+  name = 'bean-check',
+  meta = {
+    url = 'https://github.com/beancount/beancount',
+    description = 'Beancount: text-based double-entry accounting tool',
+  },
+  method = require('null-ls.methods').internal.DIAGNOSTICS_ON_SAVE,
+  filetypes = { 'beancount' },
+  generator = helpers.generator_factory{
+    command = 'bean-check',
+    args = { '$FILENAME' },
+    from_stderr = true,
+    to_stdin = true,
+    format = 'line',
+    check_exit_code = function(exit_code) return exit_code == 0 end,
+    on_output = helpers.diagnostics.from_patterns{{
+      pattern = [[(.+):(%d+):%s*(.+)]],
+      groups = { 'filename', 'row', 'message' },
+    }},
+  },
+}