diff options
Diffstat (limited to 'home')
| -rw-r--r-- | home/.config/nvim/autoload/man.vim | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/home/.config/nvim/autoload/man.vim b/home/.config/nvim/autoload/man.vim new file mode 100644 index 00000000..7385862c --- /dev/null +++ b/home/.config/nvim/autoload/man.vim @@ -0,0 +1,400 @@ +" Maintainer: Anmol Sethi <anmol@aubble.com> + +if exists('s:loaded_man') + finish +endif +let s:loaded_man = 1 + +let s:find_arg = '-w' +let s:localfile_arg = v:true " Always use -l if possible. #6683 +let s:section_arg = '-s' + +function! s:init_section_flag() + call system(['env', 'MANPAGER=cat', 'man', s:section_arg, '1', 'man']) + if v:shell_error + let s:section_arg = '-S' + endif +endfunction + +function! s:init() abort + call s:init_section_flag() + " TODO(nhooyr): Does `man -l` on SunOS list searched directories? + try + if !has('win32') && $OSTYPE !~? 'cygwin\|linux' && system('uname -s') =~? 'SunOS' && system('uname -r') =~# '^5' + let s:find_arg = '-l' + endif + " Check for -l support. + call s:get_page(s:get_path('', 'man')) + catch /E145:/ + " Ignore the error in restricted mode + catch /command error .*/ + let s:localfile_arg = v:false + endtry +endfunction + +function! man#open_page(count, count1, mods, ...) abort + if a:0 > 2 + call s:error('too many arguments') + return + elseif a:0 == 0 + let ref = &filetype ==# 'man' ? expand('<cWORD>') : expand('<cword>') + if empty(ref) + call s:error('no identifier under cursor') + return + endif + elseif a:0 ==# 1 + let ref = a:1 + else + " Combine the name and sect into a manpage reference so that all + " verification/extraction can be kept in a single function. + " If a:2 is a reference as well, that is fine because it is the only + " reference that will match. + let ref = a:2.'('.a:1.')' + endif + try + let [sect, name] = man#extract_sect_and_name_ref(ref) + if a:count ==# a:count1 + " v:count defaults to 0 which is a valid section, and v:count1 defaults to + " 1, also a valid section. If they are equal, count explicitly set. + let sect = string(a:count) + endif + let [sect, name, path] = s:verify_exists(sect, name) + catch + call s:error(v:exception) + return + endtry + + call s:push_tag() + let bufname = 'man://'.name.(empty(sect)?'':'('.sect.')') + + try + set eventignore+=BufReadCmd + if a:mods !~# 'tab' && s:find_man() + execute 'silent keepalt edit' fnameescape(bufname) + else + execute 'silent keepalt' a:mods 'split' fnameescape(bufname) + endif + finally + set eventignore-=BufReadCmd + endtry + + try + let page = s:get_page(path) + catch + if a:mods =~# 'tab' || !s:find_man() + " a new window was opened + close + endif + call s:error(v:exception) + return + endtry + + let b:man_sect = sect + call s:put_page(page) +endfunction + +function! man#read_page(ref) abort + try + let [sect, name] = man#extract_sect_and_name_ref(a:ref) + let [sect, name, path] = s:verify_exists(sect, name) + let page = s:get_page(path) + catch + call s:error(v:exception) + return + endtry + let b:man_sect = sect + call s:put_page(page) +endfunction + +" Handler for s:system() function. +function! s:system_handler(jobid, data, event) dict abort + if a:event is# 'stdout' || a:event is# 'stderr' + let self[a:event] .= join(a:data, "\n") + else + let self.exit_code = a:data + endif +endfunction + +" Run a system command and timeout after 30 seconds. +function! s:system(cmd, ...) abort + let opts = { + \ 'stdout': '', + \ 'stderr': '', + \ 'exit_code': 0, + \ 'on_stdout': function('s:system_handler'), + \ 'on_stderr': function('s:system_handler'), + \ 'on_exit': function('s:system_handler'), + \ } + let jobid = jobstart(a:cmd, opts) + + if jobid < 1 + throw printf('command error %d: %s', jobid, join(a:cmd)) + endif + + let res = jobwait([jobid], 30000) + if res[0] == -1 + try + call jobstop(jobid) + throw printf('command timed out: %s', join(a:cmd)) + catch /^Vim(call):E900:/ + endtry + elseif res[0] == -2 + throw printf('command interrupted: %s', join(a:cmd)) + endif + if opts.exit_code != 0 + throw printf("command error (%d) %s: %s", jobid, join(a:cmd), substitute(opts.stderr, '\_s\+$', '', &gdefault ? '' : 'g')) + endif + + return opts.stdout +endfunction + +function! s:get_page(path) abort + " Respect $MANWIDTH or default to window width. + let manwidth = empty($MANWIDTH) ? winwidth(0) : $MANWIDTH + " Force MANPAGER=cat to ensure Vim is not recursively invoked (by man-db). + " http://comments.gmane.org/gmane.editors.vim.devel/29085 + " Set MAN_KEEP_FORMATTING so Debian man doesn't discard backspaces. + let cmd = ['env', 'MANPAGER=cat', 'MANWIDTH='.manwidth, 'MAN_KEEP_FORMATTING=1', 'man'] + return s:system(cmd + (s:localfile_arg ? ['-l', a:path] : [a:path])) +endfunction + +function! s:put_page(page) abort + setlocal modifiable + setlocal noreadonly + silent keepjumps %delete _ + silent put =a:page + while getline(1) =~# '^\s*$' + silent keepjumps 1delete _ + endwhile + lua require("man").highlight_man_page() + setlocal filetype=man +endfunction + +function! man#show_toc() abort + let bufname = bufname('%') + let info = getloclist(0, {'winid': 1}) + if !empty(info) && getwinvar(info.winid, 'qf_toc') ==# bufname + lopen + return + endif + + let toc = [] + let lnum = 2 + let last_line = line('$') - 1 + while lnum && lnum < last_line + let text = getline(lnum) + if text =~# '^\%( \{3\}\)\=\S.*$' + call add(toc, {'bufnr': bufnr('%'), 'lnum': lnum, 'text': text}) + endif + let lnum = nextnonblank(lnum + 1) + endwhile + + call setloclist(0, toc, ' ') + call setloclist(0, [], 'a', {'title': 'Man TOC'}) + lopen + let w:qf_toc = bufname +endfunction + +" attempt to extract the name and sect out of 'name(sect)' +" otherwise just return the largest string of valid characters in ref +function! man#extract_sect_and_name_ref(ref) abort + if a:ref[0] ==# '-' " try ':Man -pandoc' with this disabled. + throw 'manpage name cannot start with ''-''' + endif + let ref = matchstr(a:ref, '[^()]\+([^()]\+)') + if empty(ref) + let name = matchstr(a:ref, '[^()]\+') + if empty(name) + throw 'manpage reference cannot contain only parentheses' + endif + return [get(b:, 'man_default_sects', ''), name] + endif + let left = split(ref, '(') + " see ':Man 3X curses' on why tolower. + " TODO(nhooyr) Not sure if this is portable across OSs + " but I have not seen a single uppercase section. + return [tolower(split(left[1], ')')[0]), left[0]] +endfunction + +function! s:get_path(sect, name) abort + " Some man implementations (OpenBSD) return all available paths from the + " search command, so we get() the first one. #8341 + if empty(a:sect) + return substitute(get(split(s:system(['man', s:find_arg, a:name])), 0, ''), '\n\+$', '', '') + endif + " '-s' flag handles: + " - tokens like 'printf(echo)' + " - sections starting with '-' + " - 3pcap section (found on macOS) + " - commas between sections (for section priority) + return substitute(get(split(s:system(['man', s:find_arg, s:section_arg, a:sect, a:name])), 0, ''), '\n\+$', '', '') +endfunction + +function! s:verify_exists(sect, name) abort + try + let path = s:get_path(a:sect, a:name) + catch /^command error (/ + try + let path = s:get_path(get(b:, 'man_default_sects', ''), a:name) + catch /^command error (/ + let path = s:get_path('', a:name) + endtry + endtry + " Extract the section from the path, because sometimes the actual section is + " more specific than what we provided to `man` (try `:Man 3 App::CLI`). + " Also on linux, name seems to be case-insensitive. So for `:Man PRIntf`, we + " still want the name of the buffer to be 'printf'. + return s:extract_sect_and_name_path(path) + [path] +endfunction + +let s:tag_stack = [] + +function! s:push_tag() abort + let s:tag_stack += [{ + \ 'buf': bufnr('%'), + \ 'lnum': line('.'), + \ 'col': col('.'), + \ }] +endfunction + +function! man#pop_tag() abort + if !empty(s:tag_stack) + let tag = remove(s:tag_stack, -1) + execute 'silent' tag['buf'].'buffer' + call cursor(tag['lnum'], tag['col']) + endif +endfunction + +" extracts the name and sect out of 'path/name.sect' +function! s:extract_sect_and_name_path(path) abort + let tail = fnamemodify(a:path, ':t') + if a:path =~# '\.\%([glx]z\|bz2\|lzma\|Z\)$' " valid extensions + let tail = fnamemodify(tail, ':r') + endif + let sect = matchstr(tail, '\.\zs[^.]\+$') + let name = matchstr(tail, '^.\+\ze\.') + return [sect, name] +endfunction + +function! s:find_man() abort + if &filetype ==# 'man' + return 1 + elseif winnr('$') ==# 1 + return 0 + endif + let thiswin = winnr() + while 1 + wincmd w + if &filetype ==# 'man' + return 1 + elseif thiswin ==# winnr() + return 0 + endif + endwhile +endfunction + +function! s:error(msg) abort + redraw + echohl ErrorMsg + echon 'man.vim: ' a:msg + echohl None +endfunction + +" see man#extract_sect_and_name_ref on why tolower(sect) +function! man#complete(arg_lead, cmd_line, cursor_pos) abort + let args = split(a:cmd_line) + let cmd_offset = index(args, 'Man') + if cmd_offset > 0 + " Prune all arguments up to :Man itself. Otherwise modifier commands like + " :tab, :vertical, etc. would lead to a wrong length. + let args = args[cmd_offset:] + endif + let l = len(args) + if l > 3 + return + elseif l ==# 1 + let name = '' + let sect = '' + elseif a:arg_lead =~# '^[^()]\+([^()]*$' + " cursor (|) is at ':Man printf(|' or ':Man 1 printf(|' + " The later is is allowed because of ':Man pri<TAB>'. + " It will offer 'priclass.d(1m)' even though section is specified as 1. + let tmp = split(a:arg_lead, '(') + let name = tmp[0] + let sect = tolower(get(tmp, 1, '')) + return s:complete(sect, '', name) + elseif args[1] !~# '^[^()]\+$' + " cursor (|) is at ':Man 3() |' or ':Man (3|' or ':Man 3() pri|' + " or ':Man 3() pri |' + return + elseif l ==# 2 + if empty(a:arg_lead) + " cursor (|) is at ':Man 1 |' + let name = '' + let sect = tolower(args[1]) + else + " cursor (|) is at ':Man pri|' + if a:arg_lead =~# '\/' + " if the name is a path, complete files + " TODO(nhooyr) why does this complete the last one automatically + return glob(a:arg_lead.'*', 0, 1) + endif + let name = a:arg_lead + let sect = '' + endif + elseif a:arg_lead !~# '^[^()]\+$' + " cursor (|) is at ':Man 3 printf |' or ':Man 3 (pr)i|' + return + else + " cursor (|) is at ':Man 3 pri|' + let name = a:arg_lead + let sect = tolower(args[1]) + endif + return s:complete(sect, sect, name) +endfunction + +function! s:complete(sect, psect, name) abort + try + let mandirs = join(split(s:system(['man', s:find_arg]), ':\|\n'), ',') + catch + call s:error(v:exception) + return + endtry + let pages = globpath(mandirs,'man?/'.a:name.'*.'.a:sect.'*', 0, 1) + " We remove duplicates in case the same manpage in different languages was found. + return uniq(sort(map(pages, 's:format_candidate(v:val, a:psect)'), 'i')) +endfunction + +function! s:format_candidate(path, psect) abort + if a:path =~# '\.\%(pdf\|in\)$' " invalid extensions + return + endif + let [sect, name] = s:extract_sect_and_name_path(a:path) + if sect ==# a:psect + return name + elseif sect =~# a:psect.'.\+$' + " We include the section if the user provided section is a prefix + " of the actual section. + return name.'('.sect.')' + endif +endfunction + +function! man#init_pager() abort + if getline(1) =~# '^\s*$' + silent keepjumps 1delete _ + else + keepjumps 1 + endif + lua require("man").highlight_man_page() + " This is not perfect. See `man glDrawArraysInstanced`. Since the title is + " all caps it is impossible to tell what the original capitilization was. + let ref = substitute(matchstr(getline(1), '^[^)]\+)'), ' ', '_', 'g') + try + let b:man_sect = man#extract_sect_and_name_ref(ref)[0] + catch + let b:man_sect = '' + endtry + execute 'silent file man://'.fnameescape(ref) +endfunction + +call s:init() |