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ad2dbd4b5f
When `man -w` is called with an empty string as section name, it may fail with an error code, which causes :Man to no longer work without a section. Just remove that argument when no section is specified.
531 lines
16 KiB
VimL
531 lines
16 KiB
VimL
" Maintainer: Anmol Sethi <hi@nhooyr.io>
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if exists('s:loaded_man')
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finish
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endif
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let s:loaded_man = 1
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let s:find_arg = '-w'
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let s:localfile_arg = v:true " Always use -l if possible. #6683
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function! man#init() abort
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try
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" Check for -l support.
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call s:get_page(s:get_path('', 'man'))
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catch /command error .*/
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let s:localfile_arg = v:false
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endtry
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endfunction
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function! man#open_page(count, mods, ...) abort
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if a:0 > 2
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call s:error('too many arguments')
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return
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elseif a:0 == 0
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let ref = &filetype ==# 'man' ? expand('<cWORD>') : expand('<cword>')
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if empty(ref)
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call s:error('no identifier under cursor')
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return
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endif
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elseif a:0 ==# 1
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let ref = a:1
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else
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" Combine the name and sect into a manpage reference so that all
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" verification/extraction can be kept in a single function.
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" If a:2 is a reference as well, that is fine because it is the only
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" reference that will match.
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let ref = a:2.'('.a:1.')'
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endif
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try
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let [sect, name] = s:extract_sect_and_name_ref(ref)
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if a:count >= 0
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let sect = string(a:count)
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endif
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let path = s:verify_exists(sect, name)
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let [sect, name] = s:extract_sect_and_name_path(path)
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catch
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call s:error(v:exception)
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return
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endtry
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let [l:buf, l:save_tfu] = [bufnr(), &tagfunc]
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try
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setlocal tagfunc=man#goto_tag
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let l:target = l:name . '(' . l:sect . ')'
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if a:mods !~# 'tab' && s:find_man()
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execute 'silent keepalt tag' l:target
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else
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execute 'silent keepalt' a:mods 'stag' l:target
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endif
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call s:set_options(v:false)
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finally
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call setbufvar(l:buf, '&tagfunc', l:save_tfu)
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endtry
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let b:man_sect = sect
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endfunction
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" Called when a man:// buffer is opened.
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function! man#read_page(ref) abort
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try
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let [sect, name] = s:extract_sect_and_name_ref(a:ref)
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let path = s:verify_exists(sect, name)
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let [sect, name] = s:extract_sect_and_name_path(path)
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let page = s:get_page(path)
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catch
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call s:error(v:exception)
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return
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endtry
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let b:man_sect = sect
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call s:put_page(page)
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endfunction
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" Handler for s:system() function.
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function! s:system_handler(jobid, data, event) dict abort
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if a:event is# 'stdout' || a:event is# 'stderr'
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let self[a:event] .= join(a:data, "\n")
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else
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let self.exit_code = a:data
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endif
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endfunction
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" Run a system command and timeout after 30 seconds.
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function! s:system(cmd, ...) abort
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let opts = {
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\ 'stdout': '',
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\ 'stderr': '',
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\ 'exit_code': 0,
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\ 'on_stdout': function('s:system_handler'),
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\ 'on_stderr': function('s:system_handler'),
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\ 'on_exit': function('s:system_handler'),
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\ }
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let jobid = jobstart(a:cmd, opts)
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if jobid < 1
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throw printf('command error %d: %s', jobid, join(a:cmd))
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endif
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let res = jobwait([jobid], 30000)
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if res[0] == -1
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try
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call jobstop(jobid)
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throw printf('command timed out: %s', join(a:cmd))
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catch /^Vim(call):E900:/
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endtry
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elseif res[0] == -2
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throw printf('command interrupted: %s', join(a:cmd))
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endif
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if opts.exit_code != 0
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throw printf("command error (%d) %s: %s", jobid, join(a:cmd), substitute(opts.stderr, '\_s\+$', '', &gdefault ? '' : 'g'))
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endif
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return opts.stdout
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endfunction
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function! s:set_options(pager) abort
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setlocal filetype=man
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setlocal noswapfile buftype=nofile bufhidden=hide
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setlocal nomodified readonly nomodifiable
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if a:pager
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nnoremap <silent> <buffer> <nowait> q :lclose<CR>:q<CR>
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endif
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endfunction
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function! s:get_page(path) abort
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" Disable hard-wrap by using a big $MANWIDTH (max 1000 on some systems #9065).
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" Soft-wrap: ftplugin/man.vim sets wrap/breakindent/….
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" Hard-wrap: driven by `man`.
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let manwidth = !get(g:, 'man_hardwrap', 1) ? 999 : (empty($MANWIDTH) ? winwidth(0) : $MANWIDTH)
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" Force MANPAGER=cat to ensure Vim is not recursively invoked (by man-db).
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" http://comments.gmane.org/gmane.editors.vim.devel/29085
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" Set MAN_KEEP_FORMATTING so Debian man doesn't discard backspaces.
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let cmd = ['env', 'MANPAGER=cat', 'MANWIDTH='.manwidth, 'MAN_KEEP_FORMATTING=1', 'man']
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return s:system(cmd + (s:localfile_arg ? ['-l', a:path] : [a:path]))
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endfunction
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function! s:put_page(page) abort
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setlocal modifiable noreadonly noswapfile
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silent keepjumps %delete _
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silent put =a:page
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while getline(1) =~# '^\s*$'
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silent keepjumps 1delete _
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endwhile
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" XXX: nroff justifies text by filling it with whitespace. That interacts
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" badly with our use of $MANWIDTH=999. Hack around this by using a fixed
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" size for those whitespace regions.
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silent! keeppatterns keepjumps %s/\s\{199,}/\=repeat(' ', 10)/g
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1
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lua require("man").highlight_man_page()
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call s:set_options(v:false)
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endfunction
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function! man#show_toc() abort
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let bufname = bufname('%')
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let info = getloclist(0, {'winid': 1})
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if !empty(info) && getwinvar(info.winid, 'qf_toc') ==# bufname
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lopen
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return
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endif
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let toc = []
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let lnum = 2
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let last_line = line('$') - 1
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while lnum && lnum < last_line
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let text = getline(lnum)
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if text =~# '^\%( \{3\}\)\=\S.*$'
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call add(toc, {'bufnr': bufnr('%'), 'lnum': lnum, 'text': text})
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endif
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let lnum = nextnonblank(lnum + 1)
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endwhile
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call setloclist(0, toc, ' ')
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call setloclist(0, [], 'a', {'title': 'Man TOC'})
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lopen
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let w:qf_toc = bufname
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endfunction
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" attempt to extract the name and sect out of 'name(sect)'
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" otherwise just return the largest string of valid characters in ref
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function! s:extract_sect_and_name_ref(ref) abort
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if a:ref[0] ==# '-' " try ':Man -pandoc' with this disabled.
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throw 'manpage name cannot start with ''-'''
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endif
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let ref = matchstr(a:ref, '[^()]\+([^()]\+)')
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if empty(ref)
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let name = matchstr(a:ref, '[^()]\+')
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if empty(name)
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throw 'manpage reference cannot contain only parentheses'
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endif
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return ['', s:spaces_to_underscores(name)]
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endif
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let left = split(ref, '(')
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" see ':Man 3X curses' on why tolower.
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" TODO(nhooyr) Not sure if this is portable across OSs
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" but I have not seen a single uppercase section.
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return [tolower(split(left[1], ')')[0]), s:spaces_to_underscores(left[0])]
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endfunction
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" replace spaces in a man page name with underscores
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" intended for PostgreSQL, which has man pages like 'CREATE_TABLE(7)';
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" while editing SQL source code, it's nice to visually select 'CREATE TABLE'
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" and hit 'K', which requires this transformation
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function! s:spaces_to_underscores(str)
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return substitute(a:str, ' ', '_', 'g')
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endfunction
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function! s:get_path(sect, name) abort
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" Some man implementations (OpenBSD) return all available paths from the
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" search command. Previously, this function would simply select the first one.
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"
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" However, some searches will report matches that are incorrect:
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" man -w strlen may return string.3 followed by strlen.3, and therefore
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" selecting the first would get us the wrong page. Thus, we must find the
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" first matching one.
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"
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" There's yet another special case here. Consider the following:
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" If you run man -w strlen and string.3 comes up first, this is a problem. We
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" should search for a matching named one in the results list.
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" However, if you search for man -w clock_gettime, you will *only* get
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" clock_getres.2, which is the right page. Searching the resuls for
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" clock_gettime will no longer work. In this case, we should just use the
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" first one that was found in the correct section.
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"
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" Finally, we can avoid relying on -S or -s here since they are very
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" inconsistently supported. Instead, call -w with a section and a name.
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if empty(a:sect)
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let results = split(s:system(['man', s:find_arg, a:name]))
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else
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let results = split(s:system(['man', s:find_arg, a:sect, a:name]))
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endif
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if empty(results)
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return ''
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endif
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" find any that match the specified name
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let namematches = filter(copy(results), 'fnamemodify(v:val, ":t") =~ a:name')
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let sectmatches = []
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if !empty(namematches) && !empty(a:sect)
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let sectmatches = filter(copy(namematches), 'fnamemodify(v:val, ":e") == a:sect')
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endif
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return substitute(get(sectmatches, 0, get(namematches, 0, results[0])), '\n\+$', '', '')
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endfunction
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" s:verify_exists attempts to find the path to a manpage
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" based on the passed section and name.
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"
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" 1. If the passed section is empty, b:man_default_sects is used.
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" 2. If manpage could not be found with the given sect and name,
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" then another attempt is made with b:man_default_sects.
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" 3. If it still could not be found, then we try again without a section.
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" 4. If still not found but $MANSECT is set, then we try again with $MANSECT
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" unset.
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"
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" This function is careful to avoid duplicating a search if a previous
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" step has already done it. i.e if we use b:man_default_sects in step 1,
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" then we don't do it again in step 2.
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function! s:verify_exists(sect, name) abort
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let sect = a:sect
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if empty(sect)
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" no section specified, so search with b:man_default_sects
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if exists('b:man_default_sects')
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let sects = split(b:man_default_sects, ',')
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for sec in sects
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try
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let res = s:get_path(sec, a:name)
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if !empty(res)
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return res
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endif
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catch /^command error (/
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endtry
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endfor
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endif
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else
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" try with specified section
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try
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let res = s:get_path(sect, a:name)
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if !empty(res)
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return res
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endif
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catch /^command error (/
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endtry
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" try again with b:man_default_sects
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if exists('b:man_default_sects')
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let sects = split(b:man_default_sects, ',')
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for sec in sects
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try
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let res = s:get_path(sec, a:name)
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if !empty(res)
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return res
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endif
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catch /^command error (/
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endtry
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endfor
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endif
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endif
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" if none of the above worked, we will try with no section
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try
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let res = s:get_path('', a:name)
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if !empty(res)
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return res
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endif
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catch /^command error (/
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endtry
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" if that still didn't work, we will check for $MANSECT and try again with it
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" unset
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if !empty($MANSECT)
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try
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let MANSECT = $MANSECT
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call setenv('MANSECT', v:null)
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let res = s:get_path('', a:name)
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if !empty(res)
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return res
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endif
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catch /^command error (/
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finally
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call setenv('MANSECT', MANSECT)
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endtry
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endif
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" finally, if that didn't work, there is no hope
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throw 'no manual entry for ' . a:name
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endfunction
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" Extracts the name/section from the 'path/name.sect', because sometimes the actual section is
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" more specific than what we provided to `man` (try `:Man 3 App::CLI`).
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" Also on linux, name seems to be case-insensitive. So for `:Man PRIntf`, we
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" still want the name of the buffer to be 'printf'.
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function! s:extract_sect_and_name_path(path) abort
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let tail = fnamemodify(a:path, ':t')
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if a:path =~# '\.\%([glx]z\|bz2\|lzma\|Z\)$' " valid extensions
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let tail = fnamemodify(tail, ':r')
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endif
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let sect = matchstr(tail, '\.\zs[^.]\+$')
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let name = matchstr(tail, '^.\+\ze\.')
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return [sect, name]
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endfunction
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function! s:find_man() abort
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let l:win = 1
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while l:win <= winnr('$')
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let l:buf = winbufnr(l:win)
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if getbufvar(l:buf, '&filetype', '') ==# 'man'
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execute l:win.'wincmd w'
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return 1
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endif
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let l:win += 1
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endwhile
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return 0
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endfunction
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function! s:error(msg) abort
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redraw
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echohl ErrorMsg
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echon 'man.vim: ' a:msg
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echohl None
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endfunction
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" see s:extract_sect_and_name_ref on why tolower(sect)
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function! man#complete(arg_lead, cmd_line, cursor_pos) abort
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let args = split(a:cmd_line)
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let cmd_offset = index(args, 'Man')
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if cmd_offset > 0
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" Prune all arguments up to :Man itself. Otherwise modifier commands like
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" :tab, :vertical, etc. would lead to a wrong length.
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let args = args[cmd_offset:]
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endif
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let l = len(args)
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if l > 3
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return
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elseif l ==# 1
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let name = ''
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let sect = ''
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elseif a:arg_lead =~# '^[^()]\+([^()]*$'
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" cursor (|) is at ':Man printf(|' or ':Man 1 printf(|'
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" The later is is allowed because of ':Man pri<TAB>'.
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" It will offer 'priclass.d(1m)' even though section is specified as 1.
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let tmp = split(a:arg_lead, '(')
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let name = tmp[0]
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let sect = tolower(get(tmp, 1, ''))
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return s:complete(sect, '', name)
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elseif args[1] !~# '^[^()]\+$'
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" cursor (|) is at ':Man 3() |' or ':Man (3|' or ':Man 3() pri|'
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" or ':Man 3() pri |'
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return
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elseif l ==# 2
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if empty(a:arg_lead)
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" cursor (|) is at ':Man 1 |'
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let name = ''
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let sect = tolower(args[1])
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else
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" cursor (|) is at ':Man pri|'
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if a:arg_lead =~# '\/'
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" if the name is a path, complete files
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" TODO(nhooyr) why does this complete the last one automatically
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return glob(a:arg_lead.'*', 0, 1)
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endif
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let name = a:arg_lead
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let sect = ''
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endif
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elseif a:arg_lead !~# '^[^()]\+$'
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" cursor (|) is at ':Man 3 printf |' or ':Man 3 (pr)i|'
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return
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else
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" cursor (|) is at ':Man 3 pri|'
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let name = a:arg_lead
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let sect = tolower(args[1])
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endif
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return s:complete(sect, sect, name)
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endfunction
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function! s:get_paths(sect, name, do_fallback) abort
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" callers must try-catch this, as some `man` implementations don't support `s:find_arg`
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try
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let mandirs = join(split(s:system(['man', s:find_arg]), ':\|\n'), ',')
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let paths = globpath(mandirs, 'man?/'.a:name.'*.'.a:sect.'*', 0, 1)
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try
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" Prioritize the result from verify_exists as it obeys b:man_default_sects.
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let first = s:verify_exists(a:sect, a:name)
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let paths = filter(paths, 'v:val !=# first')
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let paths = [first] + paths
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catch
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endtry
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return paths
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catch
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if !a:do_fallback
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throw v:exception
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endif
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" Fallback to a single path, with the page we're trying to find.
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try
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return [s:verify_exists(a:sect, a:name)]
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catch
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return []
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endtry
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endtry
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endfunction
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function! s:complete(sect, psect, name) abort
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let pages = s:get_paths(a:sect, a:name, v:false)
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" We remove duplicates in case the same manpage in different languages was found.
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return uniq(sort(map(pages, 's:format_candidate(v:val, a:psect)'), 'i'))
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endfunction
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function! s:format_candidate(path, psect) abort
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if a:path =~# '\.\%(pdf\|in\)$' " invalid extensions
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return
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endif
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let [sect, name] = s:extract_sect_and_name_path(a:path)
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if sect ==# a:psect
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return name
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elseif sect =~# a:psect.'.\+$'
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" We include the section if the user provided section is a prefix
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" of the actual section.
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return name.'('.sect.')'
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endif
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endfunction
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" Called when Nvim is invoked as $MANPAGER.
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function! man#init_pager() abort
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" https://github.com/neovim/neovim/issues/6828
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let og_modifiable = &modifiable
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setlocal modifiable
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|
|
if getline(1) =~# '^\s*$'
|
|
silent keepjumps 1delete _
|
|
else
|
|
keepjumps 1
|
|
endif
|
|
lua require("man").highlight_man_page()
|
|
" Guess the ref from the heading (which is usually uppercase, so we cannot
|
|
" know the correct casing, cf. `man glDrawArraysInstanced`).
|
|
let ref = substitute(matchstr(getline(1), '^[^)]\+)'), ' ', '_', 'g')
|
|
try
|
|
let b:man_sect = s:extract_sect_and_name_ref(ref)[0]
|
|
catch
|
|
let b:man_sect = ''
|
|
endtry
|
|
if -1 == match(bufname('%'), 'man:\/\/') " Avoid duplicate buffers, E95.
|
|
execute 'silent file man://'.tolower(fnameescape(ref))
|
|
endif
|
|
|
|
call s:set_options(v:true)
|
|
let &l:modifiable = og_modifiable
|
|
endfunction
|
|
|
|
function! man#goto_tag(pattern, flags, info) abort
|
|
let [l:sect, l:name] = s:extract_sect_and_name_ref(a:pattern)
|
|
|
|
let l:paths = s:get_paths(l:sect, l:name, v:true)
|
|
let l:structured = []
|
|
|
|
for l:path in l:paths
|
|
let [l:sect, l:name] = s:extract_sect_and_name_path(l:path)
|
|
let l:structured += [{
|
|
\ 'name': l:name,
|
|
\ 'title': l:name . '(' . l:sect . ')'
|
|
\ }]
|
|
endfor
|
|
|
|
if &cscopetag
|
|
" return only a single entry so we work well with :cstag (#11675)
|
|
let l:structured = l:structured[:0]
|
|
endif
|
|
|
|
return map(l:structured, {
|
|
\ _, entry -> {
|
|
\ 'name': entry.name,
|
|
\ 'filename': 'man://' . entry.title,
|
|
\ 'cmd': '1'
|
|
\ }
|
|
\ })
|
|
endfunction
|
|
|
|
call man#init()
|