Avoid invoking vim parser as much as possible in case vim is recent enough

examples/vim/powerline.py

@@ -28,28 +28,78 @@ modes = {
 	'!': 'SHELL',
 }
 
+if hasattr(vim, 'bindeval'):
+	# This branch is used to avoid invoking vim parser as much as possible
+
+	def get_vim_func(f, rettype=None):
+		try:
+			return vim.bindeval('function("'+f+'")')
+		except vim.error:
+			return None
+
+	vim_globals = vim.bindeval('g:')
+
+	def set_global_var(var, val):
+		vim_globals[var] = val
+else:
+	import json
+	class VimFunc(object):
+		__slots__ = ('f','rettype')
+		def __init__(self, f, rettype=None):
+			self.f       = f
+			self.rettype = rettype
+
+		def __call__(self, *args):
+			r = vim.eval(self.f+'('+json.dumps(args)[1:-1]+')')
+			if self.rettype:
+				return self.rettype(r)
+			return r
+
+	def get_vim_func(f):
+		return VimFunc(f)
+
+	def set_global_var(var, val):
+		vim.command('let g:{0}={1}'.format(var, json.dumps(val)))
+
+vim_funcs = {
+		'winwidth' : get_vim_func('winwidth', rettype=int),
+		'mode'     : get_vim_func('mode'),
+		'fghead'   : get_vim_func('fugitive#head'),
+		'line'     : get_vim_func('line', rettype=int),
+		'col'      : get_vim_func('col', rettype=int),
+		'expand'   : get_vim_func('expand'),
+		'tbcurtag' : get_vim_func('tagbar#currenttag'),
+		'sstlflag' : get_vim_func('SyntasticStatuslineFlag'),
+		'hlexists' : get_vim_func('hlexists', rettype=int),
+}
 
 def statusline():
-	winwidth = int(vim.bindeval('winwidth(0)'))
+	winwidth = vim_funcs['winwidth'](0)
 
 	# Prepare segment contents
-	mode = modes[vim.bindeval('mode()')]
+	mode = modes[vim_funcs['mode']()]
 
-	branch = vim.bindeval('fugitive#head(5)')
+	try:
+		branch = vim_funcs['fghead'](5)
+	except vim.error:
+		vim_funcs['fghead'] = None
+		branch = ''
+	except TypeError:
+		branch = ''
 	if branch:
 		branch = '⭠ ' + branch
 
-	line_current = int(vim.bindeval('line(".")'))
-	line_end = int(vim.bindeval('line("$")'))
-	line_percent = int(float(line_current) / float(line_end) * 100)
+	line_current = vim_funcs['line']('.')
+	line_end     = vim_funcs['line']('$')
+	line_percent = line_current * 100 // line_end
 
 	# Fun gradient colored percent segment
 	line_percent_gradient = [160, 166, 172, 178, 184, 190]
 	line_percent_color = line_percent_gradient[int((len(line_percent_gradient) - 1) * line_percent / 100)]
 
-	col_current = vim.bindeval('col(".")')
+	col_current = vim_funcs['col']('.')
 
-	filepath, filename = os.path.split(vim.bindeval('expand("%:~:.")'))
+	filepath, filename = os.path.split(vim_funcs['expand']('%:~:.'))
 	filename_color = 231
 	if filepath:
 		filepath += os.sep
@@ -58,19 +108,31 @@ def statusline():
 		filename = '[No Name]'
 		filename_color = 250
 
-	readonly = vim.bindeval('&ro ? "⭤ " : ""')
-	modified = vim.bindeval('&mod ? " +" : ""')
+	readonly = vim.eval('&ro ? "⭤ " : ""')
+	modified = vim.eval('&mod ? " +" : ""')
 
-	currenttag = vim.bindeval('tagbar#currenttag("%s", "")')
+	try:
+		currenttag = vim_funcs['tbcurtag']('%s', '')
+	except vim.error:
+		vim_funcs['tbcurtag'] = None
+		currenttag = ''
+	except TypeError:
+		currenttag = ''
 
 	# The Syntastic segment is center aligned (filler segment on each side) to show off how the filler segments work
 	# Not necessarily how it's going to look in the final theme
-	vim.command('let g:syntastic_stl_format = "⮃ %E{ ERRORS (%e) ⭡ %fe }%W{ WARNINGS (%w) ⭡ %fw } ⮁"')
-	syntastic = vim.bindeval('SyntasticStatuslineFlag()')
+	set_global_var('syntastic_stl_format', '⮃ %E{ ERRORS (%e) ⭡ %fe }%W{ WARNINGS (%w) ⭡ %fw } ⮁')
+	try:
+		syntastic = vim_funcs['sstlflag']()
+	except vim.error:
+		vim_funcs['sstlflag'] = None
+		syntastic = ''
+	except TypeError:
+		syntastic = ''
 
 	powerline = Powerline([
 		Segment(mode, 22, 148, attr=Segment.ATTR_BOLD),
-		Segment(vim.bindeval('&paste ? "PASTE" : ""'), 231, 166, attr=Segment.ATTR_BOLD),
+		Segment(vim.eval('&paste ? "PASTE" : ""'), 231, 166, attr=Segment.ATTR_BOLD),
 		Segment(branch, 250, 240, priority=10),
 		Segment(readonly, 196, 240, draw_divider=False),
 		Segment(filepath, 250, 240, draw_divider=False, priority=5),
@@ -80,9 +142,9 @@ def statusline():
 		Segment(filler=True, fg=236, bg=236),
 		Segment(syntastic, 214, 236, attr=Segment.ATTR_BOLD, draw_divider=False, priority=100),
 		Segment(filler=True, fg=236, bg=236),
-		Segment(vim.bindeval('&ff'), 247, 236, side='r', priority=50),
-		Segment(vim.bindeval('&fenc'), 247, 236, side='r', priority=50),
-		Segment(vim.bindeval('&ft'), 247, 236, side='r', priority=50),
+		Segment(vim.eval('&ff'), 247, 236, side='r', priority=50),
+		Segment(vim.eval('&fenc'), 247, 236, side='r', priority=50),
+		Segment(vim.eval('&ft'), 247, 236, side='r', priority=50),
 		Segment(str(line_percent).rjust(3) + '%', line_percent_color, 240, side='r', priority=30),
 		Segment('⭡ ', 239, 252, side='r'),
 		Segment(str(line_current).rjust(3), 235, 252, attr=Segment.ATTR_BOLD, side='r', draw_divider=False),
@@ -97,7 +159,7 @@ def statusline():
 
 	# Create highlighting groups
 	for group, hl in renderer.hl_groups.items():
-		if int(vim.bindeval('hlexists("{0}")'.format(group))):
+		if vim_funcs['hlexists'](group):
 			# Only create hl group if it doesn't already exist
 			continue
 
@@ -111,3 +173,7 @@ def statusline():
 			))
 
 	return stl
+
+statusline()
+
+# vim: ft=python ts=4 sts=4 sw=4 noet

examples/vim/powerline.vim

@@ -9,7 +9,7 @@ if exists('*pyeval')
 	let s:pyeval=function('pyeval')
 else
 	python import json
-	function s:pyeval(e)
+	function! s:pyeval(e)
 		python vim.command('return ' + json.dumps(eval(vim.eval('a:e'))))
 	endfunction
 endif