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-"        File: imaps.vim
-"     Authors: Srinath Avadhanula <srinath AT fastmail.fm>
-"              Benji Fisher <benji AT member.AMS.org>
-"              
-"         WWW: http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/vim-latex/vimfiles/plugin/imaps.vim?only_with_tag=MAIN
-"
-" Description: insert mode template expander with cursor placement
-"              while preserving filetype indentation.
-"
-"     $Id: imaps.vim 997 2006-03-20 09:45:45Z srinathava $
-"
-" Documentation: {{{
-"
-" Motivation:
-" this script provides a way to generate insert mode mappings which do not
-" suffer from some of the problem of mappings and abbreviations while allowing
-" cursor placement after the expansion. It can alternatively be thought of as
-" a template expander. 
-"
-" Consider an example. If you do
-"
-" imap lhs something
-"
-" then a mapping is set up. However, there will be the following problems:
-" 1. the 'ttimeout' option will generally limit how easily you can type the
-"    lhs. if you type the left hand side too slowly, then the mapping will not
-"    be activated.
-" 2. if you mistype one of the letters of the lhs, then the mapping is
-"    deactivated as soon as you backspace to correct the mistake.
-"
-" If, in order to take care of the above problems, you do instead
-"
-" iab lhs something
-"
-" then the timeout problem is solved and so is the problem of mistyping.
-" however, abbreviations are only expanded after typing a non-word character.
-" which causes problems of cursor placement after the expansion and invariably
-" spurious spaces are inserted.
-" 
-" Usage Example:
-" this script attempts to solve all these problems by providing an emulation
-" of imaps wchich does not suffer from its attendant problems. Because maps
-" are activated without having to press additional characters, therefore
-" cursor placement is possible. furthermore, file-type specific indentation is
-" preserved, because the rhs is expanded as if the rhs is typed in literally
-" by the user.
-"  
-" The script already provides some default mappings. each "mapping" is of the
-" form:
-"
-" call IMAP (lhs, rhs, ft)
-" 
-" Some characters in the RHS have special meaning which help in cursor
-" placement.
-"
-" Example One:
-"
-" 	call IMAP ("bit`", "\\begin{itemize}\<cr>\\item <++>\<cr>\\end{itemize}<++>", "tex")
-" 
-" This effectively sets up the map for "bit`" whenever you edit a latex file.
-" When you type in this sequence of letters, the following text is inserted:
-" 
-" \begin{itemize}
-" \item *
-" \end{itemize}<++>
-"
-" where * shows the cursor position. The cursor position after inserting the
-" text is decided by the position of the first "place-holder". Place holders
-" are special characters which decide cursor placement and movement. In the
-" example above, the place holder characters are <+ and +>. After you have typed
-" in the item, press <C-j> and you will be taken to the next set of <++>'s.
-" Therefore by placing the <++> characters appropriately, you can minimize the
-" use of movement keys.
-"
-" NOTE: Set g:Imap_UsePlaceHolders to 0 to disable placeholders altogether.
-" Set 
-" 	g:Imap_PlaceHolderStart and g:Imap_PlaceHolderEnd
-" to something else if you want different place holder characters.
-" Also, b:Imap_PlaceHolderStart and b:Imap_PlaceHolderEnd override the values
-" of g:Imap_PlaceHolderStart and g:Imap_PlaceHolderEnd respectively. This is
-" useful for setting buffer specific place hoders.
-" 
-" Example Two:
-" You can use the <C-r> command to insert dynamic elements such as dates.
-"	call IMAP ('date`', "\<c-r>=strftime('%b %d %Y')\<cr>", '')
-"
-" sets up the map for date` to insert the current date.
-"
-"--------------------------------------%<--------------------------------------
-" Bonus: This script also provides a command Snip which puts tearoff strings,
-" '----%<----' above and below the visually selected range of lines. The
-" length of the string is chosen to be equal to the longest line in the range.
-" Recommended Usage:
-"   '<,'>Snip
-"--------------------------------------%<--------------------------------------
-" }}}
-
-" line continuation used here.
-let s:save_cpo = &cpo
-set cpo&vim
-
-" ==============================================================================
-" Script Options / Variables
-" ============================================================================== 
-" Options {{{
-if !exists('g:Imap_StickyPlaceHolders')
-	let g:Imap_StickyPlaceHolders = 1
-endif
-if !exists('g:Imap_DeleteEmptyPlaceHolders')
-	let g:Imap_DeleteEmptyPlaceHolders = 1
-endif
-" }}}
-" Variables {{{
-" s:LHS_{ft}_{char} will be generated automatically.  It will look like
-" s:LHS_tex_o = 'fo\|foo\|boo' and contain all mapped sequences ending in "o".
-" s:Map_{ft}_{lhs} will be generated automatically.  It will look like
-" s:Map_c_foo = 'for(<++>; <++>; <++>)', the mapping for "foo".
-"
-" }}}
-
-" ==============================================================================
-" functions for easy insert mode mappings.
-" ==============================================================================
-" IMAP: Adds a "fake" insert mode mapping. {{{
-"       For example, doing
-"           IMAP('abc', 'def' ft) 
-"       will mean that if the letters abc are pressed in insert mode, then
-"       they will be replaced by def. If ft != '', then the "mapping" will be
-"       specific to the files of type ft. 
-"
-"       Using IMAP has a few advantages over simply doing:
-"           imap abc def
-"       1. with imap, if you begin typing abc, the cursor will not advance and
-"          long as there is a possible completion, the letters a, b, c will be
-"          displayed on on top of the other. using this function avoids that.
-"       2. with imap, if a backspace or arrow key is pressed before completing
-"          the word, then the mapping is lost. this function allows movement. 
-"          (this ofcourse means that this function is only limited to
-"          left-hand-sides which do not have movement keys or unprintable
-"          characters)
-"       It works by only mapping the last character of the left-hand side.
-"       when this character is typed in, then a reverse lookup is done and if
-"       the previous characters consititute the left hand side of the mapping,
-"       the previously typed characters and erased and the right hand side is
-"       inserted
-
-" IMAP: set up a filetype specific mapping.
-" Description:
-"   "maps" the lhs to rhs in files of type 'ft'. If supplied with 2
-"   additional arguments, then those are assumed to be the placeholder
-"   characters in rhs. If unspecified, then the placeholder characters
-"   are assumed to be '<+' and '+>' These placeholder characters in
-"   a:rhs are replaced with the users setting of
-"   [bg]:Imap_PlaceHolderStart and [bg]:Imap_PlaceHolderEnd settings.
-"
-function! IMAP(lhs, rhs, ft, ...)
-
-	" Find the place holders to save for IMAP_PutTextWithMovement() .
-	if a:0 < 2
-		let phs = '<+'
-		let phe = '+>'
-	else
-		let phs = a:1
-		let phe = a:2
-	endif
-
-	let hash = s:Hash(a:lhs)
-	let s:Map_{a:ft}_{hash} = a:rhs
-	let s:phs_{a:ft}_{hash} = phs
-	let s:phe_{a:ft}_{hash} = phe
-
-	" Add a:lhs to the list of left-hand sides that end with lastLHSChar:
-	let lastLHSChar = a:lhs[strlen(a:lhs)-1]
-	let hash = s:Hash(lastLHSChar)
-	if !exists("s:LHS_" . a:ft . "_" . hash)
-		let s:LHS_{a:ft}_{hash} = escape(a:lhs, '\')
-	else
-		let s:LHS_{a:ft}_{hash} = escape(a:lhs, '\') .'\|'.  s:LHS_{a:ft}_{hash}
-	endif
-
-	" map only the last character of the left-hand side.
-	if lastLHSChar == ' '
-		let lastLHSChar = '<space>'
-	end
-	exe 'inoremap <silent>'
-				\ escape(lastLHSChar, '|')
-				\ '<C-r>=<SID>LookupCharacter("' .
-				\ escape(lastLHSChar, '\|"') .
-				\ '")<CR>'
-endfunction
-
-" }}}
-" IMAP_list:  list the rhs and place holders corresponding to a:lhs {{{
-"
-" Added mainly for debugging purposes, but maybe worth keeping.
-function! IMAP_list(lhs)
-	let char = a:lhs[strlen(a:lhs)-1]
-	let charHash = s:Hash(char)
-	if exists("s:LHS_" . &ft ."_". charHash) && a:lhs =~ s:LHS_{&ft}_{charHash}
-		let ft = &ft
-	elseif exists("s:LHS__" . charHash) && a:lhs =~ s:LHS__{charHash}
-		let ft = ""
-	else
-		return ""
-	endif
-	let hash = s:Hash(a:lhs)
-	return "rhs = " . s:Map_{ft}_{hash} . " place holders = " .
-				\ s:phs_{ft}_{hash} . " and " . s:phe_{ft}_{hash}
-endfunction
-" }}}
-" LookupCharacter: inserts mapping corresponding to this character {{{
-"
-" This function extracts from s:LHS_{&ft}_{a:char} or s:LHS__{a:char}
-" the longest lhs matching the current text.  Then it replaces lhs with the
-" corresponding rhs saved in s:Map_{ft}_{lhs} .
-" The place-holder variables are passed to IMAP_PutTextWithMovement() .
-function! s:LookupCharacter(char)
-	if IMAP_GetVal('Imap_FreezeImap', 0) == 1
-		return a:char
-	endif
-	let charHash = s:Hash(a:char)
-
-	" The line so far, including the character that triggered this function:
-	let text = strpart(getline("."), 0, col(".")-1) . a:char
-	" Prefer a local map to a global one, even if the local map is shorter.
-	" Is this what we want?  Do we care?
-	" Use '\V' (very no-magic) so that only '\' is special, and it was already
-	" escaped when building up s:LHS_{&ft}_{charHash} .
-	if exists("s:LHS_" . &ft . "_" . charHash)
-				\ && text =~ "\\C\\V\\(" . s:LHS_{&ft}_{charHash} . "\\)\\$"
-		let ft = &ft
-	elseif exists("s:LHS__" . charHash)
-				\ && text =~ "\\C\\V\\(" . s:LHS__{charHash} . "\\)\\$"
-		let ft = ""
-	else
-		" If this is a character which could have been used to trigger an
-		" abbreviation, check if an abbreviation exists.
-		if a:char !~ '\k'
-			let lastword = matchstr(getline('.'), '\k\+$', '')
-			call IMAP_Debug('getting lastword = ['.lastword.']', 'imap')
-			if lastword != ''
-				" An extremeley wierd way to get around the fact that vim
-				" doesn't have the equivalent of the :mapcheck() function for
-				" abbreviations.
-				let _a = @a
-				exec "redir @a | silent! iab ".lastword." | redir END"
-				let abbreviationRHS = matchstr(@a."\n", "\n".'i\s\+'.lastword.'\s\+@\?\zs.*\ze'."\n")
-
-				call IMAP_Debug('getting abbreviationRHS = ['.abbreviationRHS.']', 'imap')
-
-				if @a =~ "No abbreviation found" || abbreviationRHS == ""
-					let @a = _a
-					return a:char
-				endif
-
-				let @a = _a
-				let abbreviationRHS = escape(abbreviationRHS, '\<"')
-				exec 'let abbreviationRHS = "'.abbreviationRHS.'"'
-
-				let lhs = lastword.a:char
-				let rhs = abbreviationRHS.a:char
-				let phs = IMAP_GetPlaceHolderStart()
-				let phe = IMAP_GetPlaceHolderEnd()
-			else
-				return a:char
-			endif
-		else
-			return a:char
-		endif
-	endif
-	" Find the longest left-hand side that matches the line so far.
-	" matchstr() returns the match that starts first. This automatically
-	" ensures that the longest LHS is used for the mapping.
-	if !exists('lhs') || !exists('rhs')
-		let lhs = matchstr(text, "\\C\\V\\(" . s:LHS_{ft}_{charHash} . "\\)\\$")
-		let hash = s:Hash(lhs)
-		let rhs = s:Map_{ft}_{hash}
-		let phs = s:phs_{ft}_{hash} 
-		let phe = s:phe_{ft}_{hash}
-	endif
-
-	if strlen(lhs) == 0
-		return a:char
-	endif
-	" enough back-spaces to erase the left-hand side; -1 for the last
-	" character typed:
-	let bs = substitute(strpart(lhs, 1), ".", "\<bs>", "g")
-	return bs . IMAP_PutTextWithMovement(rhs, phs, phe)
-endfunction
-
-" }}}
-" IMAP_PutTextWithMovement: returns the string with movement appended {{{
-" Description:
-"   If a:str contains "placeholders", then appends movement commands to
-"   str in a way that the user moves to the first placeholder and enters
-"   insert or select mode. If supplied with 2 additional arguments, then
-"   they are assumed to be the placeholder specs. Otherwise, they are
-"   assumed to be '<+' and '+>'. These placeholder chars are replaced
-"   with the users settings of [bg]:Imap_PlaceHolderStart and
-"   [bg]:Imap_PlaceHolderEnd.
-function! IMAP_PutTextWithMovement(str, ...)
-
-	" The placeholders used in the particular input string. These can be
-	" different from what the user wants to use.
-	if a:0 < 2
-		let phs = '<+'
-		let phe = '+>'
-	else
-		let phs = escape(a:1, '\')
-		let phe = escape(a:2, '\')
-	endif
-
-	let text = a:str
-
-	" The user's placeholder settings.
-	let phsUser = IMAP_GetPlaceHolderStart()
-	let pheUser = IMAP_GetPlaceHolderEnd()
-
-	" Problem:  depending on the setting of the 'encoding' option, a character
-	" such as "\xab" may not match itself.  We try to get around this by
-	" changing the encoding of all our strings.  At the end, we have to
-	" convert text back.
-	let phsEnc     = s:Iconv(phs, "encode")
-	let pheEnc     = s:Iconv(phe, "encode")
-	let phsUserEnc = s:Iconv(phsUser, "encode")
-	let pheUserEnc = s:Iconv(pheUser, "encode")
-	let textEnc    = s:Iconv(text, "encode")
-	if textEnc != text
-		let textEncoded = 1
-	else
-		let textEncoded = 0
-	endif
-
-	let pattern = '\V\(\.\{-}\)' .phs. '\(\.\{-}\)' .phe. '\(\.\*\)'
-	" If there are no placeholders, just return the text.
-	if textEnc !~ pattern
-		call IMAP_Debug('Not getting '.phs.' and '.phe.' in '.textEnc, 'imap')
-		return text
-	endif
-	" Break text up into "initial <+template+> final"; any piece may be empty.
-	let initialEnc  = substitute(textEnc, pattern, '\1', '')
-	let templateEnc = substitute(textEnc, pattern, '\2', '')
-	let finalEnc    = substitute(textEnc, pattern, '\3', '')
-
-	" If the user does not want to use placeholders, then remove all but the
-	" first placeholder.
-	" Otherwise, replace all occurences of the placeholders here with the
-	" user's choice of placeholder settings.
-	if exists('g:Imap_UsePlaceHolders') && !g:Imap_UsePlaceHolders
-		let finalEnc = substitute(finalEnc, '\V'.phs.'\.\{-}'.phe, '', 'g')
-	else
-		let finalEnc = substitute(finalEnc, '\V'.phs.'\(\.\{-}\)'.phe,
-					\ phsUserEnc.'\1'.pheUserEnc, 'g')
-	endif
-
-	" The substitutions are done, so convert back, if necessary.
-	if textEncoded
-		let initial = s:Iconv(initialEnc, "decode")
-		let template = s:Iconv(templateEnc, "decode")
-		let final = s:Iconv(finalEnc, "decode")
-	else
-		let initial = initialEnc
-		let template = templateEnc
-		let final = finalEnc
-	endif
-
-	" Build up the text to insert:
-	" 1. the initial text plus an extra character;
-	" 2. go to Normal mode with <C-\><C-N>, so it works even if 'insertmode'
-	" is set, and mark the position;
-	" 3. replace the extra character with tamplate and final;
-	" 4. back to Normal mode and restore the cursor position;
-	" 5. call IMAP_Jumpfunc().
-	let template = phsUser . template . pheUser
-	" Old trick:  insert and delete a character to get the same behavior at
-	" start, middle, or end of line and on empty lines.
-	let text = initial . "X\<C-\>\<C-N>:call IMAP_Mark('set')\<CR>\"_s"
-	let text = text . template . final
-	let text = text . "\<C-\>\<C-N>:call IMAP_Mark('go')\<CR>"
-	let text = text . "i\<C-r>=IMAP_Jumpfunc('', 1)\<CR>"
-
-	call IMAP_Debug('IMAP_PutTextWithMovement: text = ['.text.']', 'imap')
-	return text
-endfunction
-
-" }}}
-" IMAP_Jumpfunc: takes user to next <+place-holder+> {{{
-" Author: Luc Hermitte
-" Arguments:
-" direction: flag for the search() function. If set to '', search forwards,
-"            if 'b', then search backwards. See the {flags} argument of the
-"            |search()| function for valid values.
-" inclusive: In vim, the search() function is 'exclusive', i.e we always goto
-"            next cursor match even if there is a match starting from the
-"            current cursor position. Setting this argument to 1 makes
-"            IMAP_Jumpfunc() also respect a match at the current cursor
-"            position. 'inclusive'ness is necessary for IMAP() because a
-"            placeholder string can occur at the very beginning of a map which
-"            we want to select.
-"            We use a non-zero value only in special conditions. Most mappings
-"            should use a zero value.
-function! IMAP_Jumpfunc(direction, inclusive)
-
-	" The user's placeholder settings.
-	let phsUser = IMAP_GetPlaceHolderStart()
-	let pheUser = IMAP_GetPlaceHolderEnd()
-
-	let searchString = ''
-	" If this is not an inclusive search or if it is inclusive, but the
-	" current cursor position does not contain a placeholder character, then
-	" search for the placeholder characters.
-	if !a:inclusive || strpart(getline('.'), col('.')-1) !~ '\V\^'.phsUser
-		let searchString = '\V'.phsUser.'\_.\{-}'.pheUser
-	endif
-
-	" If we didn't find any placeholders return quietly.
-	if searchString != '' && !search(searchString, a:direction)
-		return ''
-	endif
-
-	" Open any closed folds and make this part of the text visible.
-	silent! foldopen!
-
-	" Calculate if we have an empty placeholder or if it contains some
-	" description.
-	let template = 
-		\ matchstr(strpart(getline('.'), col('.')-1),
-		\          '\V\^'.phsUser.'\zs\.\{-}\ze\('.pheUser.'\|\$\)')
-	let placeHolderEmpty = !strlen(template)
-
-	" If we are selecting in exclusive mode, then we need to move one step to
-	" the right
-	let extramove = ''
-	if &selection == 'exclusive'
-		let extramove = 'l'
-	endif
-
-	" Select till the end placeholder character.
-	let movement = "\<C-o>v/\\V".pheUser."/e\<CR>".extramove
-
-	" First remember what the search pattern was. s:RemoveLastHistoryItem will
-	" reset @/ to this pattern so we do not create new highlighting.
-	let g:Tex_LastSearchPattern = @/
-
-	" Now either goto insert mode or select mode.
-	if placeHolderEmpty && g:Imap_DeleteEmptyPlaceHolders
-		" delete the empty placeholder into the blackhole.
-		return movement."\"_c\<C-o>:".s:RemoveLastHistoryItem."\<CR>"
-	else
-		return movement."\<C-\>\<C-N>:".s:RemoveLastHistoryItem."\<CR>gv\<C-g>"
-	endif
-	
-endfunction
-
-" }}}
-" Maps for IMAP_Jumpfunc {{{
-"
-" These mappings use <Plug> and thus provide for easy user customization. When
-" the user wants to map some other key to jump forward, he can do for
-" instance:
-"   nmap ,f   <plug>IMAP_JumpForward
-" etc.
-
-" jumping forward and back in insert mode.
-imap <silent> <Plug>IMAP_JumpForward    <c-r>=IMAP_Jumpfunc('', 0)<CR>
-imap <silent> <Plug>IMAP_JumpBack       <c-r>=IMAP_Jumpfunc('b', 0)<CR>
-
-" jumping in normal mode
-nmap <silent> <Plug>IMAP_JumpForward        i<c-r>=IMAP_Jumpfunc('', 0)<CR>
-nmap <silent> <Plug>IMAP_JumpBack           i<c-r>=IMAP_Jumpfunc('b', 0)<CR>
-
-" deleting the present selection and then jumping forward.
-vmap <silent> <Plug>IMAP_DeleteAndJumpForward       "_<Del>i<c-r>=IMAP_Jumpfunc('', 0)<CR>
-vmap <silent> <Plug>IMAP_DeleteAndJumpBack          "_<Del>i<c-r>=IMAP_Jumpfunc('b', 0)<CR>
-
-" jumping forward without deleting present selection.
-vmap <silent> <Plug>IMAP_JumpForward       <C-\><C-N>i<c-r>=IMAP_Jumpfunc('', 0)<CR>
-vmap <silent> <Plug>IMAP_JumpBack          <C-\><C-N>`<i<c-r>=IMAP_Jumpfunc('b', 0)<CR>
-
-" }}}
-" Default maps for IMAP_Jumpfunc {{{
-" map only if there is no mapping already. allows for user customization.
-" NOTE: Default mappings for jumping to the previous placeholder are not
-"       provided. It is assumed that if the user will create such mappings
-"       hself if e so desires.
-if !hasmapto('<Plug>IMAP_JumpForward', 'i')
-    imap <C-J> <Plug>IMAP_JumpForward
-endif
-if !hasmapto('<Plug>IMAP_JumpForward', 'n')
-    nmap <C-J> <Plug>IMAP_JumpForward
-endif
-if exists('g:Imap_StickyPlaceHolders') && g:Imap_StickyPlaceHolders
-	if !hasmapto('<Plug>IMAP_JumpForward', 'v')
-		vmap <C-J> <Plug>IMAP_JumpForward
-	endif
-else
-	if !hasmapto('<Plug>IMAP_DeleteAndJumpForward', 'v')
-		vmap <C-J> <Plug>IMAP_DeleteAndJumpForward
-	endif
-endif
-" }}}
-
-nmap <silent> <script> <plug><+SelectRegion+> `<v`>
-
-" ============================================================================== 
-" enclosing selected region.
-" ============================================================================== 
-" VEnclose: encloses the visually selected region with given arguments {{{
-" Description: allows for differing action based on visual line wise
-"              selection or visual characterwise selection. preserves the
-"              marks and search history.
-function! VEnclose(vstart, vend, VStart, VEnd)
-
-	" its characterwise if
-	" 1. characterwise selection and valid values for vstart and vend.
-	" OR
-	" 2. linewise selection and invalid values for VStart and VEnd
-	if (visualmode() == 'v' && (a:vstart != '' || a:vend != '')) || (a:VStart == '' && a:VEnd == '')
-
-		let newline = ""
-		let _r = @r
-
-		let normcmd = "normal! \<C-\>\<C-n>`<v`>\"_s"
-
-		exe "normal! \<C-\>\<C-n>`<v`>\"ry"
-		if @r =~ "\n$"
-			let newline = "\n"
-			let @r = substitute(@r, "\n$", '', '')
-		endif
-
-		" In exclusive selection, we need to select an extra character.
-		if &selection == 'exclusive'
-			let movement = 8
-		else
-			let movement = 7
-		endif
-		let normcmd = normcmd.
-			\ a:vstart."!!mark!!".a:vend.newline.
-			\ "\<C-\>\<C-N>?!!mark!!\<CR>v".movement."l\"_s\<C-r>r\<C-\>\<C-n>"
-
-		" this little if statement is because till very recently, vim used to
-		" report col("'>") > length of selected line when `> is $. on some
-		" systems it reports a -ve number.
-		if col("'>") < 0 || col("'>") > strlen(getline("'>"))
-			let lastcol = strlen(getline("'>"))
-		else
-			let lastcol = col("'>")
-		endif
-		if lastcol - col("'<") != 0
-			let len = lastcol - col("'<")
-		else
-			let len = ''
-		endif
-
-		" the next normal! is for restoring the marks.
-		let normcmd = normcmd."`<v".len."l\<C-\>\<C-N>"
-
-		" First remember what the search pattern was. s:RemoveLastHistoryItem
-		" will reset @/ to this pattern so we do not create new highlighting.
-		let g:Tex_LastSearchPattern = @/
-
-		silent! exe normcmd
-		" this is to restore the r register.
-		let @r = _r
-		" and finally, this is to restore the search history.
-		execute s:RemoveLastHistoryItem
-
-	else
-
-		exec 'normal! `<O'.a:VStart."\<C-\>\<C-n>"
-		exec 'normal! `>o'.a:VEnd."\<C-\>\<C-n>"
-		if &indentexpr != ''
-			silent! normal! `<kV`>j=
-		endif
-		silent! normal! `>
-	endif
-endfunction 
-
-" }}}
-" ExecMap: adds the ability to correct an normal/visual mode mapping.  {{{
-" Author: Hari Krishna Dara <hari_vim@yahoo.com>
-" Reads a normal mode mapping at the command line and executes it with the
-" given prefix. Press <BS> to correct and <Esc> to cancel.
-function! ExecMap(prefix, mode)
-	" Temporarily remove the mapping, otherwise it will interfere with the
-	" mapcheck call below:
-	let myMap = maparg(a:prefix, a:mode)
-	exec a:mode."unmap ".a:prefix
-
-	" Generate a line with spaces to clear the previous message.
-	let i = 1
-	let clearLine = "\r"
-	while i < &columns
-		let clearLine = clearLine . ' '
-		let i = i + 1
-	endwhile
-
-	let mapCmd = a:prefix
-	let foundMap = 0
-	let breakLoop = 0
-	echon "\rEnter Map: " . mapCmd
-	while !breakLoop
-		let char = getchar()
-		if char !~ '^\d\+$'
-			if char == "\<BS>"
-				let mapCmd = strpart(mapCmd, 0, strlen(mapCmd) - 1)
-			endif
-		else " It is the ascii code.
-			let char = nr2char(char)
-			if char == "\<Esc>"
-				let breakLoop = 1
-			else
-				let mapCmd = mapCmd . char
-				if maparg(mapCmd, a:mode) != ""
-					let foundMap = 1
-					let breakLoop = 1
-				elseif mapcheck(mapCmd, a:mode) == ""
-					let mapCmd = strpart(mapCmd, 0, strlen(mapCmd) - 1)
-				endif
-			endif
-		endif
-		echon clearLine
-		echon "\rEnter Map: " . mapCmd
-	endwhile
-	if foundMap
-		if a:mode == 'v'
-			" use a plug to select the region instead of using something like
-			" `<v`> to avoid problems caused by some of the characters in
-			" '`<v`>' being mapped.
-			let gotoc = "\<plug><+SelectRegion+>"
-		else
-			let gotoc = ''
-		endif
-		exec "normal ".gotoc.mapCmd
-	endif
-	exec a:mode.'noremap '.a:prefix.' '.myMap
-endfunction
-
-" }}}
-
-" ============================================================================== 
-" helper functions
-" ============================================================================== 
-" Strntok: extract the n^th token from a list {{{
-" example: Strntok('1,23,3', ',', 2) = 23
-fun! <SID>Strntok(s, tok, n)
-	return matchstr( a:s.a:tok[0], '\v(\zs([^'.a:tok.']*)\ze['.a:tok.']){'.a:n.'}')
-endfun
-
-" }}}
-" s:RemoveLastHistoryItem: removes last search item from search history {{{
-" Description: Execute this string to clean up the search history.
-let s:RemoveLastHistoryItem = ':call histdel("/", -1)|let @/=g:Tex_LastSearchPattern'
-
-" }}}
-" s:Hash: Return a version of a string that can be used as part of a variable" {{{
-" name.
-" 	Converts every non alphanumeric character into _{ascii}_ where {ascii} is
-" 	the ASCII code for that character...
-fun! s:Hash(text)
-	return substitute(a:text, '\([^[:alnum:]]\)',
-				\ '\="_".char2nr(submatch(1))."_"', 'g')
-endfun
-"" }}}
-" IMAP_GetPlaceHolderStart and IMAP_GetPlaceHolderEnd:  "{{{
-" return the buffer local placeholder variables, or the global one, or the default.
-function! IMAP_GetPlaceHolderStart()
-	if exists("b:Imap_PlaceHolderStart") && strlen(b:Imap_PlaceHolderEnd)
-		return b:Imap_PlaceHolderStart
-	elseif exists("g:Imap_PlaceHolderStart") && strlen(g:Imap_PlaceHolderEnd)
-		return g:Imap_PlaceHolderStart
-	else
-		return "<+"
-endfun
-function! IMAP_GetPlaceHolderEnd()
-	if exists("b:Imap_PlaceHolderEnd") && strlen(b:Imap_PlaceHolderEnd)
-		return b:Imap_PlaceHolderEnd
-	elseif exists("g:Imap_PlaceHolderEnd") && strlen(g:Imap_PlaceHolderEnd)
-		return g:Imap_PlaceHolderEnd
-	else
-		return "+>"
-endfun
-" }}}
-" s:Iconv:  a wrapper for iconv()" {{{
-" Problem:  after
-" 	let text = "\xab"
-" (or using the raw 8-bit ASCII character in a file with 'fenc' set to
-" "latin1") if 'encoding' is set to utf-8, then text does not match itself:
-" 	echo text =~ text
-" returns 0.
-" Solution:  When this happens, a re-encoded version of text does match text:
-" 	echo iconv(text, "latin1", "utf8") =~ text
-" returns 1.  In this case, convert text to utf-8 with iconv().
-" TODO:  Is it better to use &encoding instead of "utf8"?  Internally, vim
-" uses utf-8, and can convert between latin1 and utf-8 even when compiled with
-" -iconv, so let's try using utf-8.
-" Arguments:
-" 	a:text = text to be encoded or decoded
-" 	a:mode = "encode" (latin1 to utf8) or "decode" (utf8 to latin1)
-" Caution:  do not encode and then decode without checking whether the text
-" has changed, becuase of the :if clause in encoding!
-function! s:Iconv(text, mode)
-	if a:mode == "decode"
-		return iconv(a:text, "utf8", "latin1")
-	endif
-	if a:text =~ '\V\^' . escape(a:text, '\') . '\$'
-		return a:text
-	endif
-	let textEnc = iconv(a:text, "latin1", "utf8")
-	if textEnc !~ '\V\^' . escape(a:text, '\') . '\$'
-		call IMAP_Debug('Encoding problems with text '.a:text.' ', 'imap')
-	endif
-	return textEnc
-endfun
-"" }}}
-" IMAP_Debug: interface to Tex_Debug if available, otherwise emulate it {{{
-" Description: 
-" Do not want a memory leak! Set this to zero so that imaps always
-" starts out in a non-debugging mode.
-if !exists('g:Imap_Debug')
-	let g:Imap_Debug = 0
-endif
-function! IMAP_Debug(string, pattern)
-	if !g:Imap_Debug
-		return
-	endif
-	if exists('*Tex_Debug')
-		call Tex_Debug(a:string, a:pattern)
-	else
-		if !exists('s:debug_'.a:pattern)
-			let s:debug_{a:pattern} = a:string
-		else
-			let s:debug_{a:pattern} = s:debug_{a:pattern}.a:string
-		endif
-	endif
-endfunction " }}}
-" IMAP_DebugClear: interface to Tex_DebugClear if avaialable, otherwise emulate it {{{
-" Description: 
-function! IMAP_DebugClear(pattern)
-	if exists('*Tex_DebugClear')
-		call Tex_DebugClear(a:pattern)
-	else	
-		let s:debug_{a:pattern} = ''
-	endif
-endfunction " }}}
-" IMAP_PrintDebug: interface to Tex_DebugPrint if avaialable, otherwise emulate it {{{
-" Description: 
-function! IMAP_PrintDebug(pattern)
-	if exists('*Tex_PrintDebug')
-		call Tex_PrintDebug(a:pattern)
-	else
-		if exists('s:debug_'.a:pattern)
-			echo s:debug_{a:pattern}
-		endif
-	endif
-endfunction " }}}
-" IMAP_Mark:  Save the cursor position (if a:action == 'set') in a" {{{
-" script-local variable; restore this position if a:action == 'go'.
-let s:Mark = "(0,0)"
-let s:initBlanks = ''
-function! IMAP_Mark(action)
-	if a:action == 'set'
-		let s:Mark = "(" . line(".") . "," . col(".") . ")"
-		let s:initBlanks = matchstr(getline('.'), '^\s*')
-	elseif a:action == 'go'
-		execute "call cursor" s:Mark
-		let blanksNow = matchstr(getline('.'), '^\s*')
-		if strlen(blanksNow) > strlen(s:initBlanks)
-			execute 'silent! normal! '.(strlen(blanksNow) - strlen(s:initBlanks)).'l'
-		elseif strlen(blanksNow) < strlen(s:initBlanks)
-			execute 'silent! normal! '.(strlen(s:initBlanks) - strlen(blanksNow)).'h'
-		endif
-	endif
-endfunction	"" }}}
-" IMAP_GetVal: gets the value of a variable {{{
-" Description: first checks window local, then buffer local etc.
-function! IMAP_GetVal(name, ...)
-	if a:0 > 0
-		let default = a:1
-	else
-		let default = ''
-	endif
-	if exists('w:'.a:name)
-		return w:{a:name}
-	elseif exists('b:'.a:name)
-		return b:{a:name}
-	elseif exists('g:'.a:name)
-		return g:{a:name}
-	else
-		return default
-	endif
-endfunction " }}}
-
-" ============================================================================== 
-" A bonus function: Snip()
-" ============================================================================== 
-" Snip: puts a scissor string above and below block of text {{{
-" Desciption:
-"-------------------------------------%<-------------------------------------
-"   this puts a the string "--------%<---------" above and below the visually
-"   selected block of lines. the length of the 'tearoff' string depends on the
-"   maximum string length in the selected range. this is an aesthetically more
-"   pleasing alternative instead of hardcoding a length.
-"-------------------------------------%<-------------------------------------
-function! <SID>Snip() range
-	let i = a:firstline
-	let maxlen = -2
-	" find out the maximum virtual length of each line.
-	while i <= a:lastline
-		exe i
-		let length = virtcol('$')
-		let maxlen = (length > maxlen ? length : maxlen)
-		let i = i + 1
-	endwhile
-	let maxlen = (maxlen > &tw && &tw != 0 ? &tw : maxlen)
-	let half = maxlen/2
-	exe a:lastline
-	" put a string below
-	exe "norm! o\<esc>".(half - 1)."a-\<esc>A%<\<esc>".(half - 1)."a-"
-	" and above. its necessary to put the string below the block of lines
-	" first because that way the first line number doesnt change...
-	exe a:firstline
-	exe "norm! O\<esc>".(half - 1)."a-\<esc>A%<\<esc>".(half - 1)."a-"
-endfunction
-
-com! -nargs=0 -range Snip :<line1>,<line2>call <SID>Snip()
-" }}}
-
-let &cpo = s:save_cpo
-
-" vim:ft=vim:ts=4:sw=4:noet:fdm=marker:commentstring=\"\ %s:nowrap