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" Remove trailing white space, see https://vi.stackexchange.com/a/456/15292
function! utils#StripTrailingWhitespaces() abort
let l:save = winsaveview()
" vint: next-line -ProhibitCommandRelyOnUser -ProhibitCommandWithUnintendedSideEffect
keeppatterns %s/\v\s+$//e
call winrestview(l:save)
endfunction
" Create command alias safely, see https://stackoverflow.com/q/3878692/6064933
" The following two functions are taken from answer below on SO:
" https://stackoverflow.com/a/10708687/6064933
function! utils#Cabbrev(key, value) abort
execute printf('cabbrev <expr> %s (getcmdtype() == ":" && getcmdpos() <= %d) ? %s : %s',
\ a:key, 1+len(a:key), <SID>Single_quote(a:value), <SID>Single_quote(a:key))
endfunction
function! s:Single_quote(str) abort
return "'" . substitute(copy(a:str), "'", "''", 'g') . "'"
endfunction
" Check the syntax group in the current cursor position, see
" https://stackoverflow.com/q/9464844/6064933 and
" https://jordanelver.co.uk/blog/2015/05/27/working-with-vim-colorschemes/
function! utils#SynGroup() abort
if !exists('*synstack')
return
endif
echo map(synstack(line('.'), col('.')), 'synIDattr(v:val, "name")')
endfunction
" Check if a colorscheme exists in runtimepath.
" The following two functions are inspired by https://stackoverflow.com/a/5703164/6064933.
function! utils#HasColorscheme(name) abort
let l:pat = printf('colors/%s.vim', a:name)
return !empty(globpath(&runtimepath, l:pat))
endfunction
" Check if an Airline theme exists in runtimepath.
function! utils#HasAirlinetheme(name) abort
let l:pat = printf('autoload/airline/themes/%s.vim', a:name)
return !empty(globpath(&runtimepath, l:pat))
endfunction
" Generate random integers in the range [Low, High] in pure vimscrpt,
" adapted from https://stackoverflow.com/a/12739441/6064933
function! utils#RandInt(Low, High) abort
" Use lua to generate random int. It is faster. Ref: https://stackoverflow.com/a/20157671/6064933
call luaeval('math.randomseed(os.time())')
return luaeval(printf('math.random(%s, %s)', a:Low, a:High))
endfunction
" Custom fold expr, adapted from https://vi.stackexchange.com/a/9094/15292
function! utils#VimFolds(lnum) abort
" get content of current line and the line below
let l:cur_line = getline(a:lnum)
let l:next_line = getline(a:lnum+1)
if l:cur_line =~# '^"{'
return '>' . (matchend(l:cur_line, '"{*') - 1)
endif
if l:cur_line ==# '' && (matchend(l:next_line, '"{*') - 1) == 1
return 0
endif
return '='
endfunction
" Custom fold text, adapted from https://vi.stackexchange.com/a/3818/15292
" and https://vi.stackexchange.com/a/6608/15292
function! utils#MyFoldText() abort
let l:line = getline(v:foldstart)
let l:fold_line_num = v:foldend - v:foldstart
let l:fold_text = substitute(l:line, '^"{\+', '', 'g')
let l:fill_char_num = &textwidth - len(l:fold_text) - len(l:fold_line_num) - 10
return printf('+%s%s %s (%s L)', repeat('-', 4), l:fold_text, repeat('-', l:fill_char_num), l:fold_line_num)
endfunction
" Toggle cursor column
function! utils#ToggleCursorCol() abort
if &cursorcolumn
set nocursorcolumn
echo 'cursorcolumn: OFF'
else
set cursorcolumn
echo 'cursorcolumn: ON'
endif
endfunction
function! utils#SwitchLine(src_line_idx, direction) abort
if a:direction ==# 'up'
if a:src_line_idx == 1
return
endif
move-2
elseif a:direction ==# 'down'
if a:src_line_idx == line('$')
return
endif
move+1
endif
endfunction
function! utils#MoveSelection(direction) abort
" only do this if previous mode is visual line mode. Once we press some keys in
" visual line mode, we will leave this mode. So the output of `mode()` will be
" `n` instead of `V`. We can use `visualmode()` instead to check the previous
" mode, see also https://stackoverflow.com/a/61486601/6064933
if visualmode() !=# 'V'
return
endif
let l:start_line = line("'<")
let l:end_line = line("'>")
let l:num_line = l:end_line - l:start_line + 1
if a:direction ==# 'up'
if l:start_line == 1
" we can also directly use `normal gv`, see https://stackoverflow.com/q/9724123/6064933
normal! gv
return
endif
silent execute printf('%s,%smove-2', l:start_line, l:end_line)
normal! gv
elseif a:direction ==# 'down'
if l:end_line == line('$')
normal! gv
return
endif
silent execute printf('%s,%smove+%s', l:start_line, l:end_line, l:num_line)
normal! gv
endif
endfunction
function! utils#Get_titlestr() abort
let l:title_str = ''
if g:is_linux
let l:title_str = hostname() . ' '
endif
let l:title_str = l:title_str . expand('%:p:~') . ' '
if &buflisted
let l:title_str = l:title_str . strftime('%Y-%m-%d %H:%M',getftime(expand('%')))
endif
return l:title_str
endfunction
" Log a message using certain highlight group
function! utils#Log(msg, ...) abort
let l:hi = ''
if len(a:000) == 1
if a:1 ==? 'info'
let l:hi = 'Normal'
elseif a:1 ==? 'warning'
let l:hi = 'WarningMsg'
elseif a:1 ==? 'error'
let l:hi = 'ErrorMsg'
else
echoerr 'Unsupported log level:' a:1
endif
else
let l:hi = 'Normal'
endif
execute 'echohl' l:hi
unsilent echomsg a:msg
echohl None
endfunction
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