Update cheatsheets

brittany

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# brittany
+
+> Pretty-print Haskell source files.
+> More information: <https://github.com/lspitzner/brittany#readme>.
+
+- Format a Haskell source file and print the result to `stdout`:
+
+`brittany {{path/to/file.hs}}`
+
+- Format all Haskell source files in the current directory in-place:
+
+`brittany --write-mode=inplace {{*.hs}}`
+
+- Check whether a Haskell source file needs changes and indicate the result through the programme's exit code:
+
+`brittany --check-mode {{path/to/file.hs}}`
+
+- Format a Haskell source file using the specified amount of spaces per indentation level and line length:
+
+`brittany --indent {{4}} --columns {{100}} {{path/to/file.hs}}`
+
+- Format a Haskell source file according to the style defined in the specified configuration file:
+
+`brittany --config-file {{path/to/config.yaml}} {{path/to/file.hs}}`