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Git/usr/share/vim/vim81/indent/README.txt

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+This directory contains files to automatically compute the indent for a
+type of file.
+
+If you want to add your own indent file for your personal use, read the docs
+at ":help indent-expression".  Looking at the existing files should give you
+inspiration.
+
+If you make a new indent file which would be useful for others, please send it
+to Bram@vim.org.  Include instructions for detecting the file type for this
+language, by file name extension or by checking a few lines in the file.
+And please stick to the rules below.
+
+If you have remarks about an existing file, send them to the maintainer of
+that file.  Only when you get no response send a message to Bram@vim.org.
+
+If you are the maintainer of an indent file and make improvements, e-mail the
+new version to Bram@vim.org.
+
+
+Rules for making an indent file:
+
+You should use this check for "b:did_indent":
+
+	" Only load this indent file when no other was loaded yet.
+	if exists("b:did_indent")
+	  finish
+	endif
+	let b:did_indent = 1
+
+Always use ":setlocal" to set 'indentexpr'.  This avoids it being carried over
+to other buffers.
+
+To trigger the indenting after typing a word like "endif", add the word to the
+'cinkeys' option with "+=".
+
+You normally set 'indentexpr' to evaluate a function and then define that
+function.  That function only needs to be defined once for as long as Vim is
+running.  Add a test if the function exists and use ":finish", like this:
+	if exists("*GetMyIndent")
+	  finish
+	endif
+
+The user may have several options set unlike you, try to write the file such
+that it works with any option settings.  Also be aware of certain features not
+being compiled in.
+
+To test the indent file, see testdir/README.txt.