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" Vim indent file
" Language: mlir
" Maintainer: The MLIR team
" Adapted from the LLVM vim indent file
" What this indent plugin currently does:
" - If no other rule matches copy indent from previous non-empty,
" non-commented line.
" - On '}' align the same as the line containing the matching '{'.
" - If previous line starts with a block label, increase indentation.
" - If the current line is a block label and ends with ':' indent at the same
" level as the enclosing '{'/'}' block.
" Stuff that would be nice to add:
" - Continue comments on next line.
" - If there is an opening+unclosed parenthesis on previous line indent to
" that.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal shiftwidth=2 expandtab
setlocal indentkeys=0{,0},<:>,!^F,o,O,e
setlocal indentexpr=GetMLIRIndent()
if exists("*GetMLIRIndent")
finish
endif
function! FindOpenBrace(lnum)
call cursor(a:lnum, 1)
return searchpair('{', '', '}', 'bW')
endfun
function! GetMLIRIndent()
" On '}' align the same as the line containing the matching '{'
let thisline = getline(v:lnum)
if thisline =~ '^\s*}'
call cursor(v:lnum, 1)
silent normal %
let opening_lnum = line('.')
if opening_lnum != v:lnum
return indent(opening_lnum)
endif
endif
" Indent labels the same as the current opening block
if thisline =~ '\^\h\+.*:\s*$'
let blockbegin = FindOpenBrace(v:lnum)
if blockbegin > 0
return indent(blockbegin)
endif
endif
" Find a non-blank not-completely commented line above the current line.
let prev_lnum = prevnonblank(v:lnum - 1)
while prev_lnum > 0 && synIDattr(synID(prev_lnum, 1 + indent(prev_lnum), 0), "name") == "mlirComment"
let prev_lnum = prevnonblank(prev_lnum-1)
endwhile
" Hit the start of the file, use zero indent.
if prev_lnum == 0
return 0
endif
let ind = indent(prev_lnum)
let prevline = getline(prev_lnum)
" Add a 'shiftwidth' after lines that start a function, block/labels, or a
" region.
if prevline =~ '{\s*$' || prevline =~ '\^\h\+.*:\s*$'
let ind = ind + &shiftwidth
endif
return ind
endfunction
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