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fun! Filename(...)
let filename = expand('%:t:r')
if filename == '' | return a:0 == 2 ? a:2 : '' | endif
return !a:0 || a:1 == '' ? filename : substitute(a:1, '$1', filename, 'g')
endf

fun s:RemoveSnippet()
unl g:snipPos s:curPos s:snipLen s:endSnip s:endSnipLine s:prevLen
endf

fun snipMate#expandSnip(snip, col)
let lnum = line('.') | let col = a:col

let snippet = s:ProcessSnippet(a:snip)
if snippet == '' | return '' | endif

let snipLines = split(substitute(snippet, '$\d\+\|${\d\+.\{-}}', '', 'g'), "\n", 1)

let line = getline(lnum)
let afterCursor = strpart(line, col - 1)
if afterCursor != "\t" && afterCursor != ' '
let line = strpart(line, 0, col - 1)
let snipLines[-1] .= afterCursor
else
let afterCursor = ''
" For some reason the cursor needs to move one right after this
if line != '' && col == 1 && &ve != 'all' && &ve != 'onemore'
let col += 1
endif
endif

call setline(lnum, line.snipLines[0])

" Autoindent snippet according to previous indentation
let indent = matchend(line, '^.\{-}\ze\(\S\|$\)') + 1
call append(lnum, map(snipLines[1:], "'".strpart(line, 0, indent - 1)."'.v:val"))
if &fen | sil! exe lnum.','.(lnum + len(snipLines) - 1).'foldopen' | endif

let [g:snipPos, s:snipLen] = s:BuildTabStops(snippet, lnum, col - indent, indent)

if s:snipLen
let s:curPos = 0
let s:endSnip = g:snipPos[s:curPos][1]
let s:endSnipLine = g:snipPos[s:curPos][0]

call cursor(g:snipPos[s:curPos][0], g:snipPos[s:curPos][1])
let s:prevLen = [line('$'), col('$')]
if g:snipPos[s:curPos][2] != -1 | return s:SelectWord() | endif
else
unl g:snipPos s:snipLen
" Place cursor at end of snippet if no tab stop is given
let newlines = len(snipLines) - 1
call cursor(lnum + newlines, indent + len(snipLines[-1]) - len(afterCursor)
\ + (newlines ? 0: col - 1))
endif
return ''
endf

fun s:ProcessSnippet(snip)
let snippet = a:snip
" Evaluate eval (`...`) expressions.
" Using a loop here instead of a regex fixes a bug with nested "\=".
if stridx(snippet, '`') != -1
while match(snippet, '`.\{-}`') != -1
let snippet = substitute(snippet, '`.\{-}`',
\ substitute(eval(matchstr(snippet, '`\zs.\{-}\ze`')),
\ "\n\\%$", '', ''), '')
endw
let snippet = substitute(snippet, "\r", "\n", 'g')
endif

" Place all text after a colon in a tab stop after the tab stop
" (e.g. "${#:foo}" becomes "${:foo}foo").
" This helps tell the position of the tab stops later.
let snippet = substitute(snippet, '${\d\+:\(.\{-}\)}', '&\1', 'g')

" Update the a:snip so that all the $# become the text after
" the colon in their associated ${#}.
" (e.g. "${1:foo}" turns all "$1"'s into "foo")
let i = 1
while stridx(snippet, '${'.i) != -1
let s = matchstr(snippet, '${'.i.':\zs.\{-}\ze}')
if s != ''
let snippet = substitute(snippet, '$'.i, '&'.s, 'g')
endif
let i += 1
endw

if &et " Expand tabs to spaces if 'expandtab' is set.
return substitute(snippet, '\t', repeat(' ', &sts ? &sts : &sw), 'g')
endif
return snippet
endf

fun s:Count(haystack, needle)
let counter = 0
let index = stridx(a:haystack, a:needle)
while index != -1
let index = stridx(a:haystack, a:needle, index+1)
let counter += 1
endw
return counter
endf

" This function builds a list of a list of each tab stop in the
" snippet containing:
" 1.) The tab stop's line number.
" 2.) The tab stop's column number
" (by getting the length of the string between the last "\n" and the
" tab stop).
" 3.) The length of the text after the colon for the current tab stop
" (e.g. "${1:foo}" would return 3). If there is no text, -1 is returned.
" 4.) If the "${#:}" construct is given, another list containing all
" the matches of "$#", to be replaced with the placeholder. This list is
" composed the same way as the parent; the first item is the line number,
" and the second is the column.
fun s:BuildTabStops(snip, lnum, col, indent)
let snipPos = []
let i = 1
let withoutVars = substitute(a:snip, '$\d\+', '', 'g')
while stridx(a:snip, '${'.i) != -1
let beforeTabStop = matchstr(withoutVars, '^.*\ze${'.i.'\D')
let withoutOthers = substitute(withoutVars, '${'.i.'\@!\d\+.\{-}}', '', 'g')
let snipPos += [[a:lnum + s:Count(beforeTabStop, "\n"),
\ a:indent + len(matchstr(withoutOthers,
\ "^.*\\(\n\\|^\\)\\zs.*\\ze${".i.'\D')), -1]]
if snipPos[i-1][0] == a:lnum
let snipPos[i-1][1] += a:col
endif

" Get all $# matches in another list, if ${#:name} is given
if stridx(withoutVars, '${'.i.':') != -1
let j = i - 1
let snipPos[j][2] = len(matchstr(withoutVars, '${'.i.':\zs.\{-}\ze}'))
let snipPos[j] += [[]]
let withoutOthers = substitute(a:snip, '${\d\+.\{-}}\|$'.i.'\@!\d\+', '', 'g')
while match(withoutOthers, '$'.i.'\D') != -1
let beforeMark = matchstr(withoutOthers, '^.\{-}\ze$'.i.'\D')
let linecount = a:lnum + s:Count(beforeMark, "\n")
let snipPos[j][3] += [[linecount,
\ a:indent + (linecount > a:lnum
\ ? len(matchstr(beforeMark, "^.*\n\\zs.*"))
\ : a:col + len(beforeMark))]]
let withoutOthers = substitute(withoutOthers, '$'.i.'\ze\D', '', '')
endw
endif
let i += 1
endw
return [snipPos, i - 1]
endf

fun snipMate#jumpTabStop()
if exists('s:update')
call s:UpdatePlaceholderTabStops()
else
call s:UpdateTabStops()
endif

let s:curPos += 1
if s:curPos == s:snipLen
let sMode = s:endSnip == g:snipPos[s:curPos-1][1]+g:snipPos[s:curPos-1][2]
call s:RemoveSnippet()
return sMode ? "\<tab>" : TriggerSnippet()
endif

call cursor(g:snipPos[s:curPos][0], g:snipPos[s:curPos][1])

let s:endSnipLine = g:snipPos[s:curPos][0]
let s:endSnip = g:snipPos[s:curPos][1]
let s:prevLen = [line('$'), col('$')]

return g:snipPos[s:curPos][2] == -1 ? '' : s:SelectWord()
endf

fun s:UpdatePlaceholderTabStops()
let changeLen = s:origWordLen - g:snipPos[s:curPos][2]
unl s:startSnip s:origWordLen s:update
if !exists('s:origPos') | return | endif
" Update tab stops in snippet if text has been added via "$#"
" (e.g., in "${1:foo}bar$1${2}").
if changeLen != 0
let curLine = line('.')

for pos in g:snipPos[s:curPos + 1:]
let changed = pos[0] == curLine && pos[1] > s:origSnipPos
let changedVars = 0
let endPlaceholder = pos[2] - 1 + pos[1]
" Subtract changeLen from each tab stop that was after any of
" the current tab stop's placeholders.
for [lnum, col] in s:origPos
if lnum > pos[0] | break | endif
if pos[0] == lnum
if pos[1] > col || (pos[2] == -1 && pos[1] == col)
let changed += 1
elseif col < endPlaceholder
let changedVars += 1
endif
endif
endfor
let pos[1] -= changeLen * changed
let pos[2] -= changeLen * changedVars " Parse variables within placeholders
" e.g., "${1:foo} ${2:$1bar}"

if pos[2] == -1 | continue | endif
" Do the same to any placeholders in the other tab stops.
for nPos in pos[3]
let changed = nPos[0] == curLine && nPos[1] > s:origSnipPos
for [lnum, col] in s:origPos
if lnum > nPos[0] | break | endif
if nPos[0] == lnum && nPos[1] > col
let changed += 1
endif
endfor
let nPos[1] -= changeLen * changed
endfor
endfor
endif
unl s:endSnip s:origPos s:origSnipPos
endf

fun s:UpdateTabStops()
let changeLine = s:endSnipLine - g:snipPos[s:curPos][0]
let changeCol = s:endSnip - g:snipPos[s:curPos][1]
if exists('s:origWordLen')
let changeCol -= s:origWordLen
unl s:origWordLen
endif
let lnum = g:snipPos[s:curPos][0]
let col = g:snipPos[s:curPos][1]
" Update the line number of all proceeding tab stops if <cr> has
" been inserted.
if changeLine != 0
let changeLine -= 1
for pos in g:snipPos[s:curPos + 1:]
if pos[0] >= lnum
if pos[0] == lnum | let pos[1] += changeCol | endif
let pos[0] += changeLine
endif
if pos[2] == -1 | continue | endif
for nPos in pos[3]
if nPos[0] >= lnum
if nPos[0] == lnum | let nPos[1] += changeCol | endif
let nPos[0] += changeLine
endif
endfor
endfor
elseif changeCol != 0
" Update the column of all proceeding tab stops if text has
" been inserted/deleted in the current line.
for pos in g:snipPos[s:curPos + 1:]
if pos[1] >= col && pos[0] == lnum
let pos[1] += changeCol
endif
if pos[2] == -1 | continue | endif
for nPos in pos[3]
if nPos[0] > lnum | break | endif
if nPos[0] == lnum && nPos[1] >= col
let nPos[1] += changeCol
endif
endfor
endfor
endif
endf

fun s:SelectWord()
let s:origWordLen = g:snipPos[s:curPos][2]
let s:oldWord = strpart(getline('.'), g:snipPos[s:curPos][1] - 1,
\ s:origWordLen)
let s:prevLen[1] -= s:origWordLen
if !empty(g:snipPos[s:curPos][3])
let s:update = 1
let s:endSnip = -1
let s:startSnip = g:snipPos[s:curPos][1] - 1
endif
if !s:origWordLen | return '' | endif
let l = col('.') != 1 ? 'l' : ''
if &sel == 'exclusive'
return "\<esc>".l.'v'.s:origWordLen."l\<c-g>"
endif
return s:origWordLen == 1 ? "\<esc>".l.'gh'
\ : "\<esc>".l.'v'.(s:origWordLen - 1)."l\<c-g>"
endf

" This updates the snippet as you type when text needs to be inserted
" into multiple places (e.g. in "${1:default text}foo$1bar$1",
" "default text" would be highlighted, and if the user types something,
" UpdateChangedSnip() would be called so that the text after "foo" & "bar"
" are updated accordingly)
"
" It also automatically quits the snippet if the cursor is moved out of it
" while in insert mode.
au CursorMovedI * call s:UpdateChangedSnip(0)
au InsertEnter * call s:UpdateChangedSnip(1)
fun s:UpdateChangedSnip(entering)
if exists('s:update') " If modifying a placeholder
if !exists('s:origPos') && s:curPos + 1 < s:snipLen
" Save the old snippet & word length before it's updated
" s:startSnip must be saved too, in case text is added
" before the snippet (e.g. in "foo$1${2}bar${1:foo}").
let s:origSnipPos = s:startSnip
let s:origPos = deepcopy(g:snipPos[s:curPos][3])
endif
let col = col('.') - 1

if s:endSnip != -1
let changeLen = col('$') - s:prevLen[1]
let s:endSnip += changeLen
else " When being updated the first time, after leaving select mode
if a:entering | return | endif
let s:endSnip = col - 1
endif

" If the cursor moves outside the snippet, quit it
if line('.') != g:snipPos[s:curPos][0] || col < s:startSnip ||
\ col - 1 > s:endSnip
unl! s:startSnip s:origWordLen s:origPos s:update
return s:RemoveSnippet()
endif

call s:UpdateVars()
let s:prevLen[1] = col('$')
elseif exists('g:snipPos')
let col = col('.')
let lnum = line('.')
let changeLine = line('$') - s:prevLen[0]

if lnum == s:endSnipLine
let s:endSnip += col('$') - s:prevLen[1]
let s:prevLen = [line('$'), col('$')]
endif
if changeLine != 0
let s:endSnipLine += changeLine
let s:endSnip = col
endif

" Delete snippet if cursor moves out of it in insert mode
if (lnum == s:endSnipLine && (col > s:endSnip || col < g:snipPos[s:curPos][1]))
\ || lnum > s:endSnipLine || lnum < g:snipPos[s:curPos][0]
call s:RemoveSnippet()
endif
endif
endf

" This updates the variables in a snippet when a placeholder has been edited.
" (e.g., each "$1" in "${1:foo} $1bar $1bar")
fun s:UpdateVars()
let newWordLen = s:endSnip - s:startSnip + 1
let newWord = strpart(getline('.'), s:startSnip, newWordLen)
if newWord == s:oldWord || empty(g:snipPos[s:curPos][3])
return
endif

let changeLen = g:snipPos[s:curPos][2] - newWordLen
let curLine = line('.')
let startCol = col('.')
let oldStartSnip = s:startSnip
let updateTabStops = changeLen != 0
let i = 0

for [lnum, col] in g:snipPos[s:curPos][3]
if updateTabStops
let start = s:startSnip
if lnum == curLine && col <= start
let s:startSnip -= changeLen
let s:endSnip -= changeLen
endif
for nPos in g:snipPos[s:curPos][3][(i):]
" This list is in ascending order, so quit if we've gone too far.
if nPos[0] > lnum | break | endif
if nPos[0] == lnum && nPos[1] > col
let nPos[1] -= changeLen
endif
endfor
if lnum == curLine && col > start
let col -= changeLen
let g:snipPos[s:curPos][3][i][1] = col
endif
let i += 1
endif

" "Very nomagic" is used here to allow special characters.
call setline(lnum, substitute(getline(lnum), '\%'.col.'c\V'.
\ escape(s:oldWord, '\'), escape(newWord, '\&'), ''))
endfor
if oldStartSnip != s:startSnip
call cursor(0, startCol + s:startSnip - oldStartSnip)
endif

let s:oldWord = newWord
let g:snipPos[s:curPos][2] = newWordLen
endf
" vim:noet:sw=4:ts=4:ft=vim
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