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Diffstat (limited to 'runtime/macros/justify.vim')
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diff --git a/runtime/macros/justify.vim b/runtime/macros/justify.vim new file mode 100644 index 000000000..41d0591fe --- /dev/null +++ b/runtime/macros/justify.vim @@ -0,0 +1,316 @@ +" Function to left and rigt align text. +" +" Written by: Preben "Peppe" Guldberg <c928400@student.dtu.dk> +" Created: 980806 14:13 (or around that time anyway) +" Revised: 001103 00:36 (See "Revisions" below) + + +" function Justify( [ textwidth [, maxspaces [, indent] ] ] ) +" +" Justify() will left and right align a line by filling in an +" appropriate amount of spaces. Extra spaces are added to existing +" spaces starting from the right side of the line. As an example, the +" following documentation has been justified. +" +" The function takes the following arguments: + +" textwidth argument +" ------------------ +" If not specified, the value of the 'textwidth' option is used. If +" 'textwidth' is zero a value of 80 is used. +" +" Additionally the arguments 'tw' and '' are accepted. The value of +" 'textwidth' will be used. These are handy, if you just want to specify +" the maxspaces argument. + +" maxspaces argument +" ------------------ +" If specified, alignment will only be done, if the longest space run +" after alignment is no longer than maxspaces. +" +" An argument of '' is accepted, should the user like to specify all +" arguments. +" +" To aid user defined commands, negative values are accepted aswell. +" Using a negative value specifies the default behaviour: any length of +" space runs will be used to justify the text. + +" indent argument +" --------------- +" This argument specifies how a line should be indented. The default is +" to keep the current indentation. +" +" Negative values: Keep current amount of leading whitespace. +" Positive values: Indent all lines with leading whitespace using this +" amount of whitespace. +" +" Note that the value 0, needs to be quoted as a string. This value +" leads to a left flushed text. +" +" Additionally units of 'shiftwidth'/'sw' and 'tabstop'/'ts' may be +" added. In this case, if the value of indent is positive, the amount of +" whitespace to be added will be multiplied by the value of the +" 'shiftwidth' and 'tabstop' settings. If these units are used, the +" argument must be given as a string, eg. Justify('','','2sw'). +" +" If the values of 'sw' or 'tw' are negative, they are treated as if +" they were 0, which means that the text is flushed left. There is no +" check if a negative number prefix is used to change the sign of a +" negative 'sw' or 'ts' value. +" +" As with the other arguments, '' may be used to get the default +" behaviour. + + +" Notes: +" +" If the line, adjusted for space runs and leading/trailing whitespace, +" is wider than the used textwidth, the line will be left untouched (no +" whitespace removed). This should be equivalent to the behaviour of +" :left, :right and :center. +" +" If the resulting line is shorter than the used textwidth it is left +" untouched. +" +" All space runs in the line are truncated before the alignment is +" carried out. +" +" If you have set 'noexpandtab', :retab! is used to replace space runs +" with whitespace using the value of 'tabstop'. This should be +" conformant with :left, :right and :center. +" +" If joinspaces is set, an extra space is added after '.', '?' and '!'. +" If 'cpooptions' include 'j', extra space is only added after '.'. +" (This may on occasion conflict with maxspaces.) + + +" Related mappings: +" +" Mappings that will align text using the current text width, using at +" most four spaces in a space run and keeping current indentation. +nmap _j :%call Justify('tw',4)<CR> +vmap _j :call Justify('tw',4)<CR> +" +" Mappings that will remove space runs and format lines (might be useful +" prior to aligning the text). +nmap ,gq :%s/\s\+/ /g<CR>gq1G +vmap ,gq :s/\s\+/ /g<CR>gvgq + + +" User defined command: +" +" The following is an ex command that works as a shortcut to the Justify +" function. Arguments to Justify() can be added after the command. +com! -range -nargs=* Justify <line1>,<line2>call Justify(<f-args>) +" +" The following commands are all equivalent: +" +" 1. Simplest use of Justify(): +" :call Justify() +" :Justify +" +" 2. The _j mapping above via the ex command: +" :%Justify tw 4 +" +" 3. Justify visualised text at 72nd column while indenting all +" previously indented text two shiftwidths +" :'<,'>call Justify(72,'','2sw') +" :'<,'>Justify 72 -1 2sw +" +" This documentation has been justified using the following command: +":se et|kz|1;/^" function Justify(/+,'z-g/^" /s/^" //|call Justify(70,3)|s/^/" / + +" Revisions: +" 001103: If 'joinspaces' was set, calculations could be wrong. +" Tabs at start of line could also lead to errors. +" Use setline() instead of "exec 's/foo/bar/' - safer. +" Cleaned up the code a bit. +" +" Todo: Convert maps to the new script specific form + +" Error function +function! Justify_error(message) + echohl Error + echo "Justify([tw, [maxspaces [, indent]]]): " . a:message + echohl None +endfunction + + +" Now for the real thing +function! Justify(...) range + + if a:0 > 3 + call Justify_error("Too many arguments (max 3)") + return 1 + endif + + " Set textwidth (accept 'tw' and '' as arguments) + if a:0 >= 1 + if a:1 =~ '^\(tw\)\=$' + let tw = &tw + elseif a:1 =~ '^\d\+$' + let tw = a:1 + else + call Justify_error("tw must be a number (>0), '' or 'tw'") + return 2 + endif + else + let tw = &tw + endif + if tw == 0 + let tw = 80 + endif + + " Set maximum number of spaces between WORDs + if a:0 >= 2 + if a:2 == '' + let maxspaces = tw + elseif a:2 =~ '^-\d\+$' + let maxspaces = tw + elseif a:2 =~ '^\d\+$' + let maxspaces = a:2 + else + call Justify_error("maxspaces must be a number or ''") + return 3 + endif + else + let maxspaces = tw + endif + if maxspaces <= 1 + call Justify_error("maxspaces should be larger than 1") + return 4 + endif + + " Set the indentation style (accept sw and ts units) + let indent_fix = '' + if a:0 >= 3 + if (a:3 == '') || a:3 =~ '^-[1-9]\d*\(shiftwidth\|sw\|tabstop\|ts\)\=$' + let indent = -1 + elseif a:3 =~ '^-\=0\(shiftwidth\|sw\|tabstop\|ts\)\=$' + let indent = 0 + elseif a:3 =~ '^\d\+\(shiftwidth\|sw\|tabstop\|ts\)\=$' + let indent = substitute(a:3, '\D', '', 'g') + elseif a:3 =~ '^\(shiftwidth\|sw\|tabstop\|ts\)$' + let indent = 1 + else + call Justify_error("indent: a number with 'sw'/'ts' unit") + return 5 + endif + if indent >= 0 + while indent > 0 + let indent_fix = indent_fix . ' ' + let indent = indent - 1 + endwhile + let indent_sw = 0 + if a:3 =~ '\(shiftwidth\|sw\)' + let indent_sw = &sw + elseif a:3 =~ '\(tabstop\|ts\)' + let indent_sw = &ts + endif + let indent_fix2 = '' + while indent_sw > 0 + let indent_fix2 = indent_fix2 . indent_fix + let indent_sw = indent_sw - 1 + endwhile + let indent_fix = indent_fix2 + endif + else + let indent = -1 + endif + + " Avoid substitution reports + let save_report = &report + set report=1000000 + + " Check 'joinspaces' and 'cpo' + if &js == 1 + if &cpo =~ 'j' + let join_str = '\(\. \)' + else + let join_str = '\([.!?!] \)' + endif + endif + + let cur = a:firstline + while cur <= a:lastline + + let str_orig = getline(cur) + let save_et = &et + set et + exec cur . "retab" + let &et = save_et + let str = getline(cur) + + let indent_str = indent_fix + let indent_n = strlen(indent_str) + " Shall we remember the current indentation + if indent < 0 + let indent_orig = matchstr(str_orig, '^\s*') + if strlen(indent_orig) > 0 + let indent_str = indent_orig + let indent_n = strlen(matchstr(str, '^\s*')) + endif + endif + + " Trim trailing, leading and running whitespace + let str = substitute(str, '\s\+$', '', '') + let str = substitute(str, '^\s\+', '', '') + let str = substitute(str, '\s\+', ' ', 'g') + let str_n = strlen(str) + + " Possible addition of space after punctuation + if exists("join_str") + let str = substitute(str, join_str, '\1 ', 'g') + endif + let join_n = strlen(str) - str_n + + " Can extraspaces be added? + " Note that str_n may be less than strlen(str) [joinspaces above] + if strlen(str) < tw - indent_n && str_n > 0 + " How many spaces should be added + let s_add = tw - str_n - indent_n - join_n + let s_nr = strlen(substitute(str, '\S', '', 'g') ) - join_n + let s_dup = s_add / s_nr + let s_mod = s_add % s_nr + + " Test if the changed line fits with tw + if 0 <= (str_n + (maxspaces - 1)*s_nr + indent_n) - tw + + " Duplicate spaces + while s_dup > 0 + let str = substitute(str, '\( \+\)', ' \1', 'g') + let s_dup = s_dup - 1 + endwhile + + " Add extra spaces from the end + while s_mod > 0 + let str = substitute(str, '\(\(\s\+\S\+\)\{' . s_mod . '}\)$', ' \1', '') + let s_mod = s_mod - 1 + endwhile + + " Indent the line + if indent_n > 0 + let str = substitute(str, '^', indent_str, '' ) + endif + + " Replace the line + call setline(cur, str) + + " Convert to whitespace + if &et == 0 + exec cur . 'retab!' + endif + + endif " Change of line + endif " Possible change + + let cur = cur + 1 + endwhile + + norm ^ + + let &report = save_report + +endfunction + +" EOF vim: tw=78 ts=8 sw=4 sts=4 noet ai |