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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