diff options
Diffstat (limited to 'runtime/indent/fortran.vim')
| -rw-r--r-- | runtime/indent/fortran.vim | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/runtime/indent/fortran.vim b/runtime/indent/fortran.vim new file mode 100644 index 000000000..b14273aa3 --- /dev/null +++ b/runtime/indent/fortran.vim @@ -0,0 +1,161 @@ +" Vim indent file +" Language: Fortran95 (and Fortran90, Fortran77, F and elf90) +" Version: 0.36 +" URL: http://www.unb.ca/chem/ajit/indent/fortran.vim +" Last Change: 2004 Apr. 05 +" Maintainer: Ajit J. Thakkar <ajit@unb.ca>; <http://www.unb.ca/chem/ajit/> +" Usage: Do :help fortran-indent from Vim + +" 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-=C + +setlocal indentkeys+==~end,=~case,=~if,=~else,=~do,=~where,=~elsewhere,=~select +setlocal indentkeys+==~endif,=~enddo,=~endwhere,=~endselect + +" Determine whether this is a fixed or free format source file +" if this hasn't been done yet +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 + else + " f90 and f95 allow 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 25 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 = 25 + 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[0] !~ '[Cc*!#]' && s:test !~ '^ \+[!#]' && 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, '!.*$', '', '') + + "Indent do loops only if they are all guaranteed to be of do/end do type + if exists("b:fortran_do_enddo") || exists("fortran_do_enddo") + if prevstat =~? '^\s*\(\d\+\s\)\=\s*\(\a\w*\s*:\)\=\s*do\>' + let ind = ind + &sw + endif + if getline(v:lnum) =~? '^\s*\(\d\+\s\)\=\s*end\s*do\>' + let ind = ind - &sw + endif + endif + + "Add a shiftwidth to statements following if, else, case, + "where and elsewhere statements + if prevstat =~? '^\s*\(\d\+\s\)\=\s*\(else\|case\|where\|elsewhere\)\>' + \ || prevstat =~? '^\s*\(\d\+\s\)\=\s*\(\a\w*\s*:\)\=\s*if\>' + let ind = ind + &sw + " Remove unwanted indent after logical and arithmetic ifs + if prevstat =~? '\<if\>' && prevstat !~? '\<then\>' + let ind = ind - &sw + endif + endif + + "Subtract a shiftwidth from else, elsewhere, case, end if, + " end where and end select statements + if getline(v:lnum) =~? '^\s*\(\d\+\s\)\=\s*' + \. '\(else\|elsewhere\|case\|end\s*\(if\|where\|select\)\)\>' + let ind = ind - &sw + " Fix indent for case statement immediately after select + if prevstat =~? '\<select\>' + let ind = ind + &sw + endif + 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 |