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- " Vim indent file
- " Language: Fortran90 (and Fortran95, Fortran77, F and elf90)
- " Version: 0.33
- " Last Change: 2001 Sep 17
- " Maintainer: Ajit J. Thakkar <ajit@unb.ca>; <http://www.unb.ca/chem/ajit/>
- " For the latest version of this file, see <http://www.unb.ca/chem/ajit/vim.htm>
-
- " Only load this indent file when no other was loaded.
- if exists("b:did_indent")
- finish
- endif
- let b:did_indent = 1
-
- setlocal indentkeys+==~end,=~case,=~if,=~else,=~do,=~where,=~elsewhere,=~select
-
- " 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")
- let b:fortran_fixed_source = 0
- 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
-
- " vim:sw=2 tw=130
-