path: root/functions.vim

" StripTrailingWhitespaces, by Drew Neil of vimcasts.org {{{1
function! <SID>StripTrailingWhitespaces()
	" Save last search and cursor position
	let _s=@/
	let l = line(".")
	let c = col(".")
	" Do the business:
	%s/\s\+$//e
	" Restore previous search history and cursor position
	let @/=_s
	call cursor(l, c)
endfunction

" SynStack, by Drew Neil of vimcasts.org {{{1
function! <SID>SynStack()
	if !exists("*synstack")
		return
	endif
	echo map(synstack(line('.'), col('.')), 'synIDattr(v:val, "name")')
endfunction

" CountCodeLines, by zlg {{{1
function! <SID>CountCodeLines()
	let code_count = 0
	for line in getbufline("%", 1, "$")
		if (len(line) > 0 && match(line, '\S\+') > -1)
			if (s:IsCommentLine(line) == 1)
				continue
			endif
			let code_count += 1
		endif
	endfor
	echo code_count . ' lines of code.'
endfunction

" IsCommentLine, by zlg {{{1
" Meant to be used with CountCodeLines()
function! s:IsCommentLine(line)
	let l:comtypes = []
	let l:comlist = split(&comments, ',')
	for i in comlist
		let l:type = split(i, ':')
		if len(type) > 1
			let l:opt = type[1]
		else
			let l:opt = type[0]
		endif
		call add(comtypes, opt)
	endfor
	let i = 0
	while i < len(comtypes)
		if match(a:line, '^\s*' . escape(comtypes[i], '/*')) > -1
			return 1
		endif
		let i += 1
	endwhile
	return 0
endfunction

" InsertDOW, by zlg {{{1
function! <SID>InsertDOW()
	" Let's backup a random register
	let tmpx = @x
	let @x = system("date +\"%a \" -d" . strftime("%Y") . "-" . substitute(expand("<cWORD>"), ":", "", ""))
	normal "xP
	" Join, since it apparently is on a line instead of just a string
	j 1
	" Return the value in the x register
	let @x = tmpx
endfunction

" BufDiff, by zlg {{{1
" Function: BufDiff
" Author: zlg <zlg+viml@zlg.space>
" Date: 2018-10-12
" License: GNU GPL, version 3 <https://gnu.org/licenses/gpl-3.0.html>
" Description: Open a new tab page with two or three buffers and enter diff mode.
" Long Description:
" BufDiff accepts two or three buffer arguments and opens a new tab page to
" work with them in diff mode. This ensures that your existing window and
" buffer layout is preserved while providing an easy way to enter a diff
" session. The arguments can be any argument that can also be passed to
" the ":buffer" Ex-command, including partial filenames (if quoted).
function! BufDiff(buf1, buf2, ...)
	let fname = substitute(expand("<sfile>"), "^function ", "", "")
	if a:0 > 1
		echohl ErrorMsg
		echomsg l:fname . ": This function accepts a maximum of three arguments."
		echohl None
		return
	endif

	" Check for a third buffer, which will default to zero if not present
	let a:buf3 = get(a:, 1, 0)

	if !bufexists(a:buf1) || !bufexists(a:buf2) || (a:0 == 1 && !bufexists(a:buf3))
		echohl ErrorMsg
		echomsg l:fname . ": One or more buffer number(s) not found!"
		echohl None
		return
	else
		tabnew
		exe ":buffer " . a:buf1
		diffthis
		vsplit
		exe ":buffer " . a:buf2
		diffthis
		if a:buf3
			vsplit
			exe ":buffer " . a:buf3
			diffthis
		endif
		return
	endif
endfunction

" SwapKeys, by zlg {{{1
" This function isn't that fancy; it just flips a variable and calls the
" mapping function.
function! SwapKeys()
	if (exists("g:use_dvorak") && (g:use_dvorak == 1 || g:use_dvorak == 0))
		let g:use_dvorak = (!g:use_dvorak)
		call SetKeyMap()
	else
		echohl ErrorMsg
		echomsg "g:use_dvorak is either unset, or an invalid value. Set to 0 or 1.
		echohl None
		return
	endif
endfunction

" SetKeyMap, by zlg {{{1
" Function: SetKeyMap
" Author: zlg <zlg+vim@zlg.space>
" Date: 2018-11-15
" License: GNU GPL, version 3 <https://gnu.org/licenses/gpl-3.0.html>
" Long Description:
" SetKeyMap allows the user to set their keybindings according to the value of
" a global variable. In this case, it's g:use_dvorak, to swap between Dvorak
" and QWERTY layouts. It can be extended to use any number of key mappings
" that you need.
function! SetKeyMap()
	if g:use_dvorak == 1
		" I use a Dvorak keyboard, so standard vim movement keys are a hassle.
		" Since mnemonics are helpful all around, I need a mapping that gives me
		" pain-free file navigation without screwing up mnemonics (too much).
		"
		" Thus:
		" (D)elete is now (K)ill: d2w == k2w "kill 2 words"
		" Un(T)il is now (J)ump-To: dt( == kj( "kill, jump-to paren"
		" (N)ext is now (L)eap: cn == cl "change up to leap point"

		" Standard movement, which is the true focus of this hack.
		" Mnemonics are awesome, so let's preserve as much as possible.
		noremap d h
		noremap h j
		noremap t k
		noremap n l
		noremap D H
		noremap H J
		noremap T K
		noremap N L

		noremap gh gj
		noremap gt gk

		" I work with tabs every now and then. No, I don't have a mnemonic.
		noremap gj gt
		noremap gJ gT

		" Window movement, equally important
		noremap <C-w>d <C-w>h
		noremap <C-w>h <C-w>j
		noremap <C-w>t <C-w>k
		noremap <C-w>n <C-w>l

		nnoremap <C-w><C-d> <C-w><C-h>
		nnoremap <C-w><C-h> <C-w><C-j>
		nnoremap <C-w><C-t> <C-w><C-k>
		nnoremap <C-w><C-n> <C-w><C-l>

		nnoremap <C-d> <C-w>h
		nnoremap <C-h> <C-w>j
		nnoremap <C-t> <C-w>k
		nnoremap <C-n> <C-w>l

		" Account for tag jumping
		nnoremap <C-j> <C-t>

		" Remappings for the D key
		noremap k d
		noremap K D

		" Remappings for the T key
		noremap j t
		noremap J T

		" Remapping for the L key
		noremap l n
		noremap L N

		" General purpose help; the originals remain for convenience
		noremap - 0
		noremap _ $

		" Fold-related keybindings
		noremap zh zj
		noremap zt zk
		echomsg "Bindings set to Dvorak"
	else
		" set qwerty keys; basically just resetting things
		noremap h h
		noremap j j
		noremap k k
		noremap l l
		noremap H H
		noremap J J
		noremap K K
		noremap L L

		noremap gj gj
		noremap gh gh

		noremap gt gt
		noremap gT gT

		noremap <C-w>h <C-w>h
		noremap <C-w>j <C-w>j
		noremap <C-w>h <C-w>k
		noremap <C-w>l <C-w>l

		nnoremap <C-w><C-h> <C-w><C-h>
		nnoremap <C-w><C-j> <C-w><C-j>
		nnoremap <C-w><C-k> <C-w><C-k>
		nnoremap <C-w><C-l> <C-w><C-l>

		nnoremap <C-h> <C-w>h
		nnoremap <C-j> <C-w>j
		nnoremap <C-k> <C-w>k
		nnoremap <C-l> <C-w>l

		nnoremap <C-t> <C-t>

		noremap d d
		noremap D D

		noremap t t
		noremap T T

		noremap n n
		noremap N N

		noremap - 0
		noremap _ $

		noremap zj zj
		noremap zk zk
		echomsg "Bindings set to QWERTY"
	endif
endfunction

" Custom folding display function
function! MyFoldText()
	let indent = repeat('	', indent(v:foldstart))
	let line = substitute(getline(v:foldstart), '\v^\s+', '', '')
	let folded_lines = v:foldend - v:foldstart
	return indent . line . ' (' . folded_lines . 'L)'
endfunction

" vim: foldmethod=marker