--- /dev/null
+" Vim indent file
+" Language: Rust
+" Author: Chris Morgan <me@chrismorgan.info>
+" Last Change: 2014 Sep 13
+" from https://github.com/wting/rust.vim/blob/master/indent/rust.vim
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+setlocal cindent
+setlocal cinoptions=L0,(0,Ws,J1,j1
+setlocal cinkeys=0{,0},!^F,o,O,0[,0]
+" Don't think cinwords will actually do anything at all... never mind
+setlocal cinwords=for,if,else,while,loop,impl,mod,unsafe,trait,struct,enum,fn,extern
+
+" Some preliminary settings
+setlocal nolisp " Make sure lisp indenting doesn't supersede us
+setlocal autoindent " indentexpr isn't much help otherwise
+" Also do indentkeys, otherwise # gets shoved to column 0 :-/
+setlocal indentkeys=0{,0},!^F,o,O,0[,0]
+
+setlocal indentexpr=GetRustIndent(v:lnum)
+
+" Only define the function once.
+if exists("*GetRustIndent")
+ finish
+endif
+
+" Come here when loading the script the first time.
+
+function! s:get_line_trimmed(lnum)
+ " Get the line and remove a trailing comment.
+ " Use syntax highlighting attributes when possible.
+ " NOTE: this is not accurate; /* */ or a line continuation could trick it
+ let line = getline(a:lnum)
+ let line_len = strlen(line)
+ if has('syntax_items')
+ " If the last character in the line is a comment, do a binary search for
+ " the start of the comment. synID() is slow, a linear search would take
+ " too long on a long line.
+ if synIDattr(synID(a:lnum, line_len, 1), "name") =~ 'Comment\|Todo'
+ let min = 1
+ let max = line_len
+ while min < max
+ let col = (min + max) / 2
+ if synIDattr(synID(a:lnum, col, 1), "name") =~ 'Comment\|Todo'
+ let max = col
+ else
+ let min = col + 1
+ endif
+ endwhile
+ let line = strpart(line, 0, min - 1)
+ endif
+ return substitute(line, "\s*$", "", "")
+ else
+ " Sorry, this is not complete, nor fully correct (e.g. string "//").
+ " Such is life.
+ return substitute(line, "\s*//.*$", "", "")
+ endif
+endfunction
+
+function! s:is_string_comment(lnum, col)
+ if has('syntax_items')
+ for id in synstack(a:lnum, a:col)
+ let synname = synIDattr(id, "name")
+ if synname == "rustString" || synname =~ "^rustComment"
+ return 1
+ endif
+ endfor
+ else
+ " without syntax, let's not even try
+ return 0
+ endif
+endfunction
+
+function GetRustIndent(lnum)
+
+ " Starting assumption: cindent (called at the end) will do it right
+ " normally. We just want to fix up a few cases.
+
+ let line = getline(a:lnum)
+
+ if has('syntax_items')
+ let synname = synIDattr(synID(a:lnum, 1, 1), "name")
+ if synname == "rustString"
+ " If the start of the line is in a string, don't change the indent
+ return -1
+ elseif synname =~ '\(Comment\|Todo\)'
+ \ && line !~ '^\s*/\*' " not /* opening line
+ if synname =~ "CommentML" " multi-line
+ if line !~ '^\s*\*' && getline(a:lnum - 1) =~ '^\s*/\*'
+ " This is (hopefully) the line after a /*, and it has no
+ " leader, so the correct indentation is that of the
+ " previous line.
+ return GetRustIndent(a:lnum - 1)
+ endif
+ endif
+ " If it's in a comment, let cindent take care of it now. This is
+ " for cases like "/*" where the next line should start " * ", not
+ " "* " as the code below would otherwise cause for module scope
+ " Fun fact: " /*\n*\n*/" takes two calls to get right!
+ return cindent(a:lnum)
+ endif
+ endif
+
+ " cindent gets second and subsequent match patterns/struct members wrong,
+ " as it treats the comma as indicating an unfinished statement::
+ "
+ " match a {
+ " b => c,
+ " d => e,
+ " f => g,
+ " };
+
+ " Search backwards for the previous non-empty line.
+ let prevlinenum = prevnonblank(a:lnum - 1)
+ let prevline = s:get_line_trimmed(prevlinenum)
+ while prevlinenum > 1 && prevline !~ '[^[:blank:]]'
+ let prevlinenum = prevnonblank(prevlinenum - 1)
+ let prevline = s:get_line_trimmed(prevlinenum)
+ endwhile
+ if prevline[len(prevline) - 1] == ","
+ \ && s:get_line_trimmed(a:lnum) !~ '^\s*[\[\]{}]'
+ \ && prevline !~ '^\s*fn\s'
+ \ && prevline !~ '([^()]\+,$'
+ " Oh ho! The previous line ended in a comma! I bet cindent will try to
+ " take this too far... For now, let's normally use the previous line's
+ " indent.
+
+ " One case where this doesn't work out is where *this* line contains
+ " square or curly brackets; then we normally *do* want to be indenting
+ " further.
+ "
+ " Another case where we don't want to is one like a function
+ " definition with arguments spread over multiple lines:
+ "
+ " fn foo(baz: Baz,
+ " baz: Baz) // <-- cindent gets this right by itself
+ "
+ " Another case is similar to the previous, except calling a function
+ " instead of defining it, or any conditional expression that leaves
+ " an open paren:
+ "
+ " foo(baz,
+ " baz);
+ "
+ " if baz && (foo ||
+ " bar) {
+ "
+ " There are probably other cases where we don't want to do this as
+ " well. Add them as needed.
+ return indent(prevlinenum)
+ endif
+
+ if !has("patch-7.4.355")
+ " cindent before 7.4.355 doesn't do the module scope well at all; e.g.::
+ "
+ " static FOO : &'static [bool] = [
+ " true,
+ " false,
+ " false,
+ " true,
+ " ];
+ "
+ " uh oh, next statement is indented further!
+
+ " Note that this does *not* apply the line continuation pattern properly;
+ " that's too hard to do correctly for my liking at present, so I'll just
+ " start with these two main cases (square brackets and not returning to
+ " column zero)
+
+ call cursor(a:lnum, 1)
+ if searchpair('{\|(', '', '}\|)', 'nbW',
+ \ 's:is_string_comment(line("."), col("."))') == 0
+ if searchpair('\[', '', '\]', 'nbW',
+ \ 's:is_string_comment(line("."), col("."))') == 0
+ " Global scope, should be zero
+ return 0
+ else
+ " At the module scope, inside square brackets only
+ "if getline(a:lnum)[0] == ']' || search('\[', '', '\]', 'nW') == a:lnum
+ if line =~ "^\\s*]"
+ " It's the closing line, dedent it
+ return 0
+ else
+ return &shiftwidth
+ endif
+ endif
+ endif
+ endif
+
+ " Fall back on cindent, which does it mostly right
+ return cindent(a:lnum)
+endfunction
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