Fix #109 add g:deoplete#file#enable_buffer_path

doc/deoplete.txt

@@ -257,6 +257,17 @@ g:deoplete#omni#functions
 b:deoplete_omni_functions
 		Buffer local variable of |g:deoplete#omni#functions|.
 
+				*g:deoplete#file#enable_buffer_path*
+g:deoplete#file#enable_buffer_path
+		If it is 1, file source complete the files from the buffer
+		path instead of the current directory.
+
+		Default value: 1
+
+				*b:deoplete_file_enable_buffer_path*
+b:deoplete_file_enable_buffer_path
+		Buffer local variable of |g:deoplete#file#enable_buffer_path|.
+
 ------------------------------------------------------------------------------
 FUNCTIONS 					*deoplete-functions*
 

rplugin/python3/deoplete/sources/file.py

@@ -28,6 +28,8 @@
 import re
 from os.path import exists, dirname
 from .base import Base
+from deoplete.util import \
+    set_default, get_simple_buffer_config
 
 
 class Source(Base):
@@ -39,6 +41,8 @@ def __init__(self, vim):
         self.mark = '[F]'
         self.min_pattern_length = 0
 
+        set_default(self.vim, 'g:deoplete#file#enable_buffer_path', 1)
+
     def get_complete_position(self, context):
         pos = context['input'].rfind('/')
         return pos if pos < 0 else pos + 1
@@ -72,9 +76,19 @@ def __longest_path_that_exists(self, input_str):
         return None
 
     def __substitute_path(self, path):
-        m = re.match(r'\./', path)
+        buffer_path = get_simple_buffer_config(
+            self.vim,
+            'b:deoplete_file_enable_buffer_path',
+            'g:deoplete#file#enable_buffer_path')
+        m = re.match(r'(\.+)/', path)
         if m:
-            return re.sub(r'^\.', self.vim.funcs.getcwd(), path)
+            h = self.vim.funcs.repeat(':h', len(m.group(1)))
+            return re.sub(r'^\.+',
+                          self.vim.funcs.fnamemodify(
+                              (self.vim.funcs.bufname('%')
+                               if buffer_path
+                               else self.vim.funcs.getcwd()), ':p' + h),
+                          path)
         m = re.match(r'~/', path)
         if m and os.environ.get('HOME'):
             return re.sub(r'^~', os.environ.get('HOME'), path)