Do indentation properly in Vim.
The cases that this improves are clearly documented inside the committed file, so this commit message is comparatively brief.
This commit is contained in:
Chris Morgan
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cf65870962
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" Vim indent file
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" Language: Rust
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" Author: Chris Morgan <me@chrismorgan.info>
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" Last Change: 2013 Jul 10
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" Only load this indent file when no other was loaded.
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if exists("b:did_indent")
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finish
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finish
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endif
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let b:did_indent = 1
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setlocal cindent
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setlocal cinoptions=L0,(0,Ws,JN
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setlocal cinkeys=0{,0},!^F,o,O
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setlocal cinkeys=0{,0},!^F,o,O,0[,0]
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" Don't think cinwords will actually do anything at all... never mind
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setlocal cinwords=do,for,if,else,while,loop,impl,mod,unsafe,trait,struct,enum,fn,extern
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" Some preliminary settings
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setlocal nolisp " Make sure lisp indenting doesn't supersede us
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setlocal autoindent " indentexpr isn't much help otherwise
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" Also do indentkeys, otherwise # gets shoved to column 0 :-/
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setlocal indentkeys=0{,0},!^F,o,O,0[,0]
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setlocal indentexpr=GetRustIndent(v:lnum)
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" Only define the function once.
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if exists("*GetRustIndent")
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finish
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endif
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" Come here when loading the script the first time.
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function s:get_line_trimmed(lnum)
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" Get the line and remove a trailing comment.
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" Use syntax highlighting attributes when possible.
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" NOTE: this is not accurate; /* */ or a line continuation could trick it
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let line = getline(a:lnum)
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let line_len = strlen(line)
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if has('syntax_items')
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" If the last character in the line is a comment, do a binary search for
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" the start of the comment. synID() is slow, a linear search would take
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" too long on a long line.
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if synIDattr(synID(a:lnum, line_len, 1), "name") =~ "Comment\|Todo"
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let min = 1
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let max = line_len
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while min < max
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let col = (min + max) / 2
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if synIDattr(synID(a:lnum, col, 1), "name") =~ "Comment\|Todo"
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let max = col
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else
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let min = col + 1
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endif
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endwhile
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let line = strpart(line, 0, min - 1)
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endif
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return substitute(line, "\s*$", "", "")
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else
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" Sorry, this is not complete, nor fully correct (e.g. string "//").
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" Such is life.
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return substitute(line, "\s*//.*$", "", "")
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endif
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endfunction
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function GetRustIndent(lnum)
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" Starting assumption: cindent (called at the end) will do it right
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" normally. We just want to fix up a few cases.
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if has('syntax_items')
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if synIDattr(synID(a:lnum, 1, 1), "name") == "rustString"
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" If the start of the line is in a string, don't change the indent
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return -1
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elseif synIDattr(synID(a:lnum, 1, 1), "name") =~ "\\(Comment\\|Todo\\)"
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\ && getline(a:lnum) !~ "^\\s*/\\*"
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" If it's in a comment, let cindent take care of it now. This is
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" for cases like "/*" where the next line should start " * ", not
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" "* " as the code below would otherwise cause for module scope
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" Fun fact: " /*\n*\n*/" takes two calls to get right!
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return cindent(a:lnum)
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endif
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endif
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" cindent gets second and subsequent match patterns/struct members wrong,
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" as it treats the comma as indicating an unfinished statement::
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"
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" match a {
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" b => c,
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" d => e,
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" f => g,
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" };
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" Search backwards for the previous non-empty line.
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let prevline = s:get_line_trimmed(prevnonblank(a:lnum - 1))
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if prevline[len(prevline) - 1] == ","
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\ && s:get_line_trimmed(a:lnum) !~ "^\\s*[\\[\\]{}]"
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" Oh ho! The previous line ended in a comma! I bet cindent will try to
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" take this too far... For now, let's use the previous line's indent
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return GetRustIndent(a:lnum - 1)
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endif
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" cindent doesn't do the module scope well at all; e.g.::
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"
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" static FOO : &'static [bool] = [
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" true,
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" false,
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" false,
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" true,
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" ];
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"
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" uh oh, next statement is indented further!
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" Note that this does *not* apply the line continuation pattern properly;
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" that's too hard to do correctly for my liking at present, so I'll just
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" start with these two main cases (square brackets and not returning to
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" column zero)
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let line = getline(a:lnum)
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call cursor(a:lnum, 1)
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if searchpair('{\|(', '', '}\|)', 'nbW') == 0
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if searchpair('\[', '', '\]', 'nbW') == 0
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" Global scope, should be zero
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return 0
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else
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" At the module scope, inside square brackets only
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"if getline(a:lnum)[0] == ']' || search('\[', '', '\]', 'nW') == a:lnum
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if line =~ "^\\s*]"
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" It's the closing line, dedent it
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return 0
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else
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return &shiftwidth
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endif
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endif
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endif
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" Fall back on cindent, which does it mostly right
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return cindent(a:lnum)
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endfunction
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