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justify.vim
" Function to left and right 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 = strdisplaywidth(str) " Possible addition of space after punctuation if exists("join_str") let str = substitute(str, join_str, '\1 ', 'g') endif let join_n = strdisplaywidth(str) - str_n " Can extraspaces be added? " Note that str_n may be less than strlen(str) [joinspaces above] if strdisplaywidth(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
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