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fortran.vim
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" Vim indent file " Language: Fortran 2008 (and older: Fortran 2003, 95, 90, and 77) " Version: 47 " Last Change: 2016 Oct. 29 " Maintainer: Ajit J. Thakkar <ajit@unb.ca>; <http://www2.unb.ca/~ajit/> " Usage: For instructions, do :help fortran-indent from Vim " Credits: " Useful suggestions were made, in chronological order, by: " Albert Oliver Serra, Takuya Fujiwara and Philipp Edelmann. " Only load this indent file when no other was loaded. if exists("b:did_indent") finish endif let b:did_indent = 1 let s:cposet=&cpoptions set cpoptions&vim setlocal indentkeys+==~end,=~case,=~if,=~else,=~do,=~where,=~elsewhere,=~select setlocal indentkeys+==~endif,=~enddo,=~endwhere,=~endselect,=~elseif setlocal indentkeys+==~type,=~interface,=~forall,=~associate,=~block,=~enum setlocal indentkeys+==~endforall,=~endassociate,=~endblock,=~endenum if exists("b:fortran_indent_more") || exists("g:fortran_indent_more") setlocal indentkeys+==~function,=~subroutine,=~module,=~contains,=~program setlocal indentkeys+==~endfunction,=~endsubroutine,=~endmodule setlocal indentkeys+==~endprogram endif " Determine whether this is a fixed or free format source file " if this hasn't been done yet using the priority: " buffer-local value " > global value " > file extension as in Intel ifort, gcc (gfortran), NAG, Pathscale, and Cray compilers if !exists("b:fortran_fixed_source") if exists("fortran_free_source") " User guarantees free source form let b:fortran_fixed_source = 0 elseif exists("fortran_fixed_source") " User guarantees fixed source form let b:fortran_fixed_source = 1 elseif expand("%:e") ==? "f\<90\|95\|03\|08\>" " Free-form file extension defaults as in Intel ifort, gcc(gfortran), NAG, Pathscale, and Cray compilers let b:fortran_fixed_source = 0 elseif expand("%:e") ==? "f\|f77\|for" " Fixed-form file extension defaults let b:fortran_fixed_source = 1 else " Modern fortran still allows both fixed and free source form " Assume fixed source form unless signs of free source form " are detected in the first five columns of the first s:lmax lines. " Detection becomes more accurate and time-consuming if more lines " are checked. Increase the limit below if you keep lots of comments at " the very top of each file and you have a fast computer. let s:lmax = 500 if ( s:lmax > line("$") ) let s:lmax = line("$") endif let b:fortran_fixed_source = 1 let s:ln=1 while s:ln <= s:lmax let s:test = strpart(getline(s:ln),0,5) if s:test !~ '^[Cc*]' && s:test !~ '^ *[!#]' && s:test =~ '[^ 0-9\t]' && s:test !~ '^[ 0-9]*\t' let b:fortran_fixed_source = 0 break endif let s:ln = s:ln + 1 endwhile endif endif " Define the appropriate indent function but only once if (b:fortran_fixed_source == 1) setlocal indentexpr=FortranGetFixedIndent() if exists("*FortranGetFixedIndent") finish endif else setlocal indentexpr=FortranGetFreeIndent() if exists("*FortranGetFreeIndent") finish endif endif function FortranGetIndent(lnum) let ind = indent(a:lnum) let prevline=getline(a:lnum) " Strip tail comment let prevstat=substitute(prevline, '!.*$', '', '') let prev2line=getline(a:lnum-1) let prev2stat=substitute(prev2line, '!.*$', '', '') "Indent do loops only if they are all guaranteed to be of do/end do type if exists("b:fortran_do_enddo") || exists("g:fortran_do_enddo") if prevstat =~? '^\s*\(\d\+\s\)\=\s*\(\a\w*\s*:\)\=\s*do\>' let ind = ind + shiftwidth() endif if getline(v:lnum) =~? '^\s*\(\d\+\s\)\=\s*end\s*do\>' let ind = ind - shiftwidth() endif endif "Add a shiftwidth to statements following if, else, else if, case, class, "where, else where, forall, type, interface and associate statements if prevstat =~? '^\s*\(case\|class\|else\|else\s*if\|else\s*where\)\>' \ ||prevstat=~? '^\s*\(type\|interface\|associate\|enum\)\>' \ ||prevstat=~?'^\s*\(\d\+\s\)\=\s*\(\a\w*\s*:\)\=\s*\(forall\|where\|block\)\>' \ ||prevstat=~? '^\s*\(\d\+\s\)\=\s*\(\a\w*\s*:\)\=\s*if\>' let ind = ind + shiftwidth() " Remove unwanted indent after logical and arithmetic ifs if prevstat =~? '\<if\>' && prevstat !~? '\<then\>' let ind = ind - shiftwidth() endif " Remove unwanted indent after type( statements if prevstat =~? '^\s*type\s*(' let ind = ind - shiftwidth() endif endif "Indent program units unless instructed otherwise if !exists("b:fortran_indent_less") && !exists("g:fortran_indent_less") let prefix='\(\(pure\|impure\|elemental\|recursive\)\s\+\)\{,2}' let type='\(\(integer\|real\|double\s\+precision\|complex\|logical' \.'\|character\|type\|class\)\s*\S*\s\+\)\=' if prevstat =~? '^\s*\(contains\|submodule\|program\)\>' \ ||prevstat =~? '^\s*'.'module\>\(\s*\procedure\)\@!' \ ||prevstat =~? '^\s*'.prefix.'subroutine\>' \ ||prevstat =~? '^\s*'.prefix.type.'function\>' \ ||prevstat =~? '^\s*'.type.prefix.'function\>' let ind = ind + shiftwidth() endif if getline(v:lnum) =~? '^\s*contains\>' \ ||getline(v:lnum)=~? '^\s*end\s*' \ .'\(function\|subroutine\|module\|submodule\|program\)\>' let ind = ind - shiftwidth() endif endif "Subtract a shiftwidth from else, else if, elsewhere, case, class, end if, " end where, end select, end forall, end interface, end associate, " end enum, end type, end block and end type statements if getline(v:lnum) =~? '^\s*\(\d\+\s\)\=\s*' \. '\(else\|else\s*if\|else\s*where\|case\|class\|' \. 'end\s*\(if\|where\|select\|interface\|' \. 'type\|forall\|associate\|enum\|block\)\)\>' let ind = ind - shiftwidth() " Fix indent for case statement immediately after select if prevstat =~? '\<select\s\+\(case\|type\)\>' let ind = ind + shiftwidth() endif endif "First continuation line if prevstat =~ '&\s*$' && prev2stat !~ '&\s*$' let ind = ind + shiftwidth() endif "Line after last continuation line if prevstat !~ '&\s*$' && prev2stat =~ '&\s*$' && prevstat !~? '\<then\>' let ind = ind - shiftwidth() endif return ind endfunction function FortranGetFreeIndent() "Find the previous non-blank line let lnum = prevnonblank(v:lnum - 1) "Use zero indent at the top of the file if lnum == 0 return 0 endif let ind=FortranGetIndent(lnum) return ind endfunction function FortranGetFixedIndent() let currline=getline(v:lnum) "Don't indent comments, continuation lines and labelled lines if strpart(currline,0,6) =~ '[^ \t]' let ind = indent(v:lnum) return ind endif "Find the previous line which is not blank, not a comment, "not a continuation line, and does not have a label let lnum = v:lnum - 1 while lnum > 0 let prevline=getline(lnum) if (prevline =~ "^[C*!]") || (prevline =~ "^\s*$") \ || (strpart(prevline,5,1) !~ "[ 0]") " Skip comments, blank lines and continuation lines let lnum = lnum - 1 else let test=strpart(prevline,0,5) if test =~ "[0-9]" " Skip lines with statement numbers let lnum = lnum - 1 else break endif endif endwhile "First line must begin at column 7 if lnum == 0 return 6 endif let ind=FortranGetIndent(lnum) return ind endfunction let &cpoptions=s:cposet unlet s:cposet " vim:sw=2 tw=130