if !exists('loaded_snippet') || &cp
    finish
endif

" Given a string containing a list of arguments (e.g. "one, two = 'test'"),
" this function cleans it up by removing useless whitespace and commas.
function! PyCleanupArgs(text)
    if a:text == 'args'
        return ''
    endif
    let text = substitute(a:text, '\(\w\)\s\(\w\)', '\1,\2', 'g')
    return join(split(text, '\s*,\s*'), ', ')
endfunction

" Given a string containing a list of arguments (e.g. "one = 'test', *args,
" **kwargs"), this function returns a string containing only the variable
" names, separated by spaces, e.g. "one two".
function! PyGetVarnamesFromArgs(text)
    let text = substitute(a:text, 'self,*\s*', '',  '')
    let text = substitute(text, '\*\*\?\k\+', '',  'g')
    let text = substitute(text,   '=.\{-},',    '',  'g')
    let text = substitute(text,   '=.\{-}$',    '',  'g')
    let text = substitute(text,   '\s*,\s*',    ' ', 'g')
    if text == ' '
        return ''
    endif
    return text
endfunction

" Returns the current indent as a string.
function! PyGetIndentString()
    if &expandtab
        let tabs   = indent('.') / &shiftwidth
        let tabstr = repeat(' ', &shiftwidth)
    else
        let tabs   = indent('.') / &tabstop
        let tabstr = '\t'
    endif
    return repeat(tabstr, tabs)
endfunction

" Given a string containing a list of arguments (e.g. "one = 'test', *args,
" **kwargs"), this function returns them formatted correctly for the
" docstring.
function! PyGetDocstringFromArgs(text)
    let text = PyGetVarnamesFromArgs(a:text)
    if a:text == 'args' || text == ''
        return ''
    endif
    let indent  = PyGetIndentString()
    let st      = g:snip_start_tag
    let et      = g:snip_end_tag
    let docvars = map(split(text), 'v:val." -- ".st.et')
    return '\n'.indent.join(docvars, '\n'.indent).'\n'.indent
endfunction

" Given a string containing a list of arguments (e.g. "one = 'test', *args,
" **kwargs"), this function returns them formatted as a variable assignment in
" the form "self._ONE = ONE", as used in class constructors.
function! PyGetVariableInitializationFromVars(text)
    let text = PyGetVarnamesFromArgs(a:text)
    if a:text == 'args' || text == ''
        return ''
    endif
    let indent      = PyGetIndentString()
    let st          = g:snip_start_tag
    let et          = g:snip_end_tag
    let assert_vars = map(split(text), '"assert ".v:val." ".st.et')
    let assign_vars = map(split(text), '"self._".v:val." = ".v:val')
    let assertions  = join(assert_vars, '\n'.indent)
    let assignments = join(assign_vars, '\n'.indent)
    return assertions.'\n'.indent.assignments.'\n'.indent
endfunction

" Given a string containing a list of arguments (e.g. "one = 'test', *args,
" **kwargs"), this function returns them with the default arguments removed.
function! PyStripDefaultValue(text)
    return substitute(a:text, '=.*', '', 'g')
endfunction

" Returns the number of occurences of needle in haystack.
function! Count(haystack, needle)
    let counter = 0
    let index = match(a:haystack, a:needle)
    while index > -1
        let counter = counter + 1
        let index = match(a:haystack, a:needle, index+1)
    endwhile
    return counter
endfunction

" Returns replacement if the given subject matches the given match.
" Returns the subject otherwise.
function! PyReplace(subject, match, replacement)
    if a:subject == a:match
        return a:replacement
    endif
    return a:subject
endfunction

" Returns the % operator with a tuple containing n elements appended, where n
" is the given number.
function! PyHashArgList(count)
    if a:count == 0
        return ''
    endif
    let st = g:snip_start_tag
    let et = g:snip_end_tag
    return ' % ('.st.et.repeat(', '.st.et, a:count - 1).')'
endfunction

let st = g:snip_start_tag
let et = g:snip_end_tag
let cd = g:snip_elem_delim

" Note to users: The following method of defininf snippets is to allow for
" changes to the default tags.
" Feel free to define your own as so:
"    Snippet mysnip This is the expansion text.<{}>
" There is no need to use exec if you are happy to hardcode your own start and
" end tags

" Properties, setters and getters.
exec "Snippet prop ".st."attribute".et." = property(get_".st."attribute".et.", set_".st."attribute".et.st.et.")<CR>".st.et
exec "Snippet get def get_".st."name".et."(self):<CR>return self._".st."name".et."<CR>".st.et
exec "Snippet set def set_".st."name".et."(self, ".st."value".et."):
\<CR>self._".st."name".et." = ".st."value:PyStripDefaultValue(@z)".et."
\<CR>".st.et

" Functions and methods.
exec "Snippet def def ".st."fname".et."(".st."args:PyCleanupArgs(@z)".et."):
\<CR>\"\"\"
\<CR>".st.et."
\<CR>".st."args:PyGetDocstringFromArgs(@z)".et."\"\"\"
\<CR>".st."pass".et."
\<CR>".st.et
exec "Snippet cm ".st."class".et." = classmethod(".st."class".et.")<CR>".st.et

" Class definition.
exec "Snippet cl class ".st."ClassName".et."(".st."object".et."):
\<CR>\"\"\"
\<CR>This class represents ".st.et."
\<CR>\"\"\"
\<CR>
\<CR>def __init__(self, ".st."args:PyCleanupArgs(@z)".et."):
\<CR>\"\"\"
\<CR>Constructor.
\<CR>".st."args:PyGetDocstringFromArgs(@z)".et."\"\"\"
\<CR>".st."args:PyGetVariableInitializationFromVars(@z)".et.st.et

" Keywords
exec "Snippet for for ".st."variable".et." in ".st."ensemble".et.":<CR>".st."pass".et."<CR>".st.et
exec "Snippet pf print '".st."s".et."'".st."s:PyHashArgList(Count(@z, '%[^%]'))".et."<CR>".st.et
exec "Snippet im import ".st."module".et."<CR>".st.et
exec "Snippet from from ".st."module".et." import ".st.'name:PyReplace(@z, "name", "*")'.et."<CR>".st.et
exec "Snippet % '".st."s".et."'".st."s:PyHashArgList(Count(@z, '%[^%]'))".et.st.et
exec "Snippet ass assert ".st."expression".et.st.et
" From Kib2
exec "Snippet bc \"\"\"<CR>".st.et."<CR>\"\"\"<CR>".st.et

" Try, except, finally.
exec "Snippet trye try:
\<CR>".st.et."
\<CR>except Exception, e:
\<CR>".st.et."
\<CR>".st.et

exec "Snippet tryf try:
\<CR>".st.et."
\<CR>finally:
\<CR>".st.et."
\<CR>".st.et

exec "Snippet tryef try:
\<CR>".st.et."
\<CR>except Exception, e:
\<CR>".st.et."
\<CR>finally:
\<CR>".st.et."
\<CR>".st.et

" Other multi statement templates
" From Panos
exec "Snippet ifn if __name__ == '".st."main".et."':<CR>".st.et
exec "Snippet ifmain if __name__ == '__main__':<CR>".st.et

" Shebang
exec "Snippet sb #!/usr/bin/env python<CR># -*- coding: ".st."encoding".et." -*-<CR>".st.et
exec "Snippet sbu #!/usr/bin/env python<CR># -*- coding: UTF-8 -*-<CR>".st.et
" From Kib2
exec "Snippet sbl1 #!/usr/bin/env python<CR># -*- coding: Latin-1 -*-<CR>".st.et

" Unit tests.
exec "Snippet unittest if __name__ == '__main__':
\<CR>import unittest
\<CR>
\<CR>class ".st."ClassName".et."Test(unittest.TestCase):
\<CR>def setUp(self):
\<CR>".st."pass".et."
\<CR>
\<CR>def runTest(self):
\<CR>".st.et