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" Vim indent file
" Language: Hare
" Maintainer: Amelia Clarke <me@rsaihe.dev>
" Last Change: 2022 Sep 22
" 2023 Aug 28 by Vim Project (undo_indent)
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
if !has("cindent") || !has("eval")
finish
endif
setlocal cindent
" L0 -> don't deindent labels
" (s -> use one indent after a trailing (
" m1 -> if ) starts a line, indent it the same as its matching (
" ks -> add an extra indent to extra lines in an if expression or for expression
" j1 -> indent code inside {} one level when in parentheses
" J1 -> see j1
" *0 -> don't search for unclosed block comments
" #1 -> don't deindent lines that begin with #
setlocal cinoptions=L0,(s,m1,ks,j1,J1,*0,#1
" Controls which keys reindent the current line.
" 0{ -> { at beginning of line
" 0} -> } at beginning of line
" 0) -> ) at beginning of line
" 0] -> ] at beginning of line
" !^F -> <C-f> (not inserted)
" o -> <CR> or `o` command
" O -> `O` command
" e -> else
" 0=case -> case
setlocal indentkeys=0{,0},0),0],!^F,o,O,e,0=case
setlocal cinwords=if,else,for,switch,match
setlocal indentexpr=GetHareIndent()
let b:undo_indent = "setl cin< cino< cinw< inde< indk<"
function! FloorCindent(lnum)
return cindent(a:lnum) / shiftwidth() * shiftwidth()
endfunction
function! GetHareIndent()
let line = getline(v:lnum)
let prevlnum = prevnonblank(v:lnum - 1)
let prevline = getline(prevlnum)
let prevprevline = getline(prevnonblank(prevlnum - 1))
" This is all very hacky and imperfect, but it's tough to do much better when
" working with regex-based indenting rules.
" If the previous line ended with =, indent by one shiftwidth.
if prevline =~# '\v\=\s*(//.*)?$'
return indent(prevlnum) + shiftwidth()
endif
" If the previous line ended in a semicolon and the line before that ended
" with =, deindent by one shiftwidth.
if prevline =~# '\v;\s*(//.*)?$' && prevprevline =~# '\v\=\s*(//.*)?$'
return indent(prevlnum) - shiftwidth()
endif
" TODO: The following edge-case is still indented incorrectly:
" case =>
" if (foo) {
" bar;
" };
" | // cursor is incorrectly deindented by one shiftwidth.
"
" This only happens if the {} block is the first statement in the case body.
" If `case` is typed, the case will also be incorrectly deindented by one
" shiftwidth. Are you having fun yet?
" Deindent cases.
if line =~# '\v^\s*case'
" If the previous line was also a case, don't do any special indenting.
if prevline =~# '\v^\s*case'
return indent(prevlnum)
end
" If the previous line was a multiline case, deindent by one shiftwidth.
if prevline =~# '\v\=\>\s*(//.*)?$'
return indent(prevlnum) - shiftwidth()
endif
" If the previous line started a block, deindent by one shiftwidth.
" This handles the first case in a switch/match block.
if prevline =~# '\v\{\s*(//.*)?$'
return FloorCindent(v:lnum) - shiftwidth()
end
" If the previous line ended in a semicolon and the line before that wasn't
" a case, deindent by one shiftwidth.
if prevline =~# '\v;\s*(//.*)?$' && prevprevline !~# '\v\=\>\s*(//.*)?$'
return FloorCindent(v:lnum) - shiftwidth()
end
let l:indent = FloorCindent(v:lnum)
" If a normal cindent would indent the same amount as the previous line,
" deindent by one shiftwidth. This fixes some issues with `case let` blocks.
if l:indent == indent(prevlnum)
return l:indent - shiftwidth()
endif
" Otherwise, do a normal cindent.
return l:indent
endif
" Don't indent an extra shiftwidth for cases which span multiple lines.
if prevline =~# '\v\=\>\s*(//.*)?$' && prevline !~# '\v^\s*case\W'
return indent(prevlnum)
endif
" Indent the body of a case.
" If the previous line ended in a semicolon and the line before that was a
" case, don't do any special indenting.
if prevline =~# '\v;\s*(//.*)?$' && prevprevline =~# '\v\=\>\s*(//.*)?$' && line !~# '\v^\s*}'
return indent(prevlnum)
endif
let l:indent = FloorCindent(v:lnum)
" If the previous line was a case and a normal cindent wouldn't indent, indent
" an extra shiftwidth.
if prevline =~# '\v\=\>\s*(//.*)?$' && l:indent == indent(prevlnum)
return l:indent + shiftwidth()
endif
" If everything above is false, do a normal cindent.
return l:indent
endfunction
" vim: tabstop=2 shiftwidth=2 expandtab
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