Remove support for Python2 (#1129)

Python 3 is > 10 years old and Python 2 will no longer be supported in a few months. Time to get rid of it, simplifying the code base (slightly) and opening the opportunities to use the Py3 quality of life improvements.

Author: SirVer

Diff for: .gitignore

@@ -1,4 +1,5 @@
 *.pyc
 *.swp
 doc/tags
-.ropeproject/
+/.ropeproject/
+/.mypy_cache/

Diff for: .travis.yml

@@ -2,10 +2,6 @@ sudo: required
 services: docker
 
 env:
-  - VIM_VERSION="7.4" PYTHON_IMAGE=2.7-stretch TAG=vim_74_py2
-  - VIM_VERSION="8.0" PYTHON_IMAGE=2.7-stretch TAG=vim_80_py2
-  - VIM_VERSION="8.1" PYTHON_IMAGE=2.7-stretch TAG=vim_81_py2
-  - VIM_VERSION="git" PYTHON_IMAGE=2.7-stretch TAG=vim_git_py2
   - VIM_VERSION="7.4" PYTHON_IMAGE=3.6-stretch TAG=vim_74_py36
   - VIM_VERSION="8.0" PYTHON_IMAGE=3.6-stretch TAG=vim_80_py36
   - VIM_VERSION="8.1" PYTHON_IMAGE=3.6-stretch TAG=vim_81_py36

Diff for: Makefile

@@ -2,14 +2,6 @@ MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
 MAKEFILE_DIR := $(dir ${MAKEFILE_PATH})
 
 # Test images as run on CI.
-image_vim_74_py2:
-	docker build -t ultisnips:$@ --build-arg PYTHON_IMAGE=2.7-stretch --build-arg VIM_VERSION=7.4 .
-image_vim_80_py2:
-	docker build -t ultisnips:$@ --build-arg PYTHON_IMAGE=2.7-stretch --build-arg VIM_VERSION=8.0 .
-image_vim_81_py2:
-	docker build -t ultisnips:$@ --build-arg PYTHON_IMAGE=2.7-stretch --build-arg VIM_VERSION=8.1 .
-image_vim_git_py2:
-	docker build -t ultisnips:$@ --build-arg PYTHON_IMAGE=2.7-stretch --build-arg VIM_VERSION=git .
 image_vim_74_py36:
 	docker build -t ultisnips:$@ --build-arg PYTHON_IMAGE=3.6-stretch --build-arg VIM_VERSION=7.4 .
 image_vim_80_py36:

Diff for: after/plugin/UltiSnips_after.vim

@@ -1,6 +1,6 @@
 " Called after everything else to reclaim keys (Needed for Supertab)
 
-if exists("b:did_after_plugin_ultisnips_after") || !exists("g:_uspy")
+if exists("b:did_after_plugin_ultisnips_after")
    finish
 endif
 let b:did_after_plugin_ultisnips_after = 1

Diff for: autoload/UltiSnips.vim

@@ -1,19 +1,19 @@
-if exists("b:did_autoload_ultisnips") || !exists("g:_uspy")
+if exists("b:did_autoload_ultisnips")
     finish
 endif
 let b:did_autoload_ultisnips = 1
 
 " Also import vim as we expect it to be imported in many places.
-exec g:_uspy "import vim"
-exec g:_uspy "from UltiSnips import UltiSnips_Manager"
+py3 import vim
+py3 from UltiSnips import UltiSnips_Manager
 
 function! s:compensate_for_pum() abort
     """ The CursorMovedI event is not triggered while the popup-menu is visible,
     """ and it's by this event that UltiSnips updates its vim-state. The fix is
     """ to explicitly check for the presence of the popup menu, and update
     """ the vim-state accordingly.
     if pumvisible()
-        exec g:_uspy "UltiSnips_Manager._cursor_moved()"
+        py3 UltiSnips_Manager._cursor_moved()
     endif
 endfunction
 
@@ -23,7 +23,7 @@ function! UltiSnips#Edit(bang, ...) abort
     else
         let type = ""
     endif
-    exec g:_uspy "vim.command(\"let file = '%s'\" % UltiSnips_Manager._file_to_edit(vim.eval(\"type\"), vim.eval('a:bang')))"
+    py3 vim.command("let file = '%s'" % UltiSnips_Manager._file_to_edit(vim.eval("type"), vim.eval('a:bang')))
 
     if !len(file)
        return
@@ -48,7 +48,7 @@ function! UltiSnips#Edit(bang, ...) abort
 endfunction
 
 function! UltiSnips#AddFiletypes(filetypes) abort
-    exec g:_uspy "UltiSnips_Manager.add_buffer_filetypes('" . a:filetypes . "')"
+    py3 UltiSnips_Manager.add_buffer_filetypes('" . a:filetypes . "')
     return ""
 endfunction
 
@@ -69,18 +69,18 @@ function! UltiSnips#FileTypeComplete(arglead, cmdline, cursorpos) abort
 endfunction
 
 function! UltiSnips#ExpandSnippet() abort
-    exec g:_uspy "UltiSnips_Manager.expand()"
+    py3 UltiSnips_Manager.expand()
     return ""
 endfunction
 
 function! UltiSnips#ExpandSnippetOrJump() abort
     call s:compensate_for_pum()
-    exec g:_uspy "UltiSnips_Manager.expand_or_jump()"
+    py3 UltiSnips_Manager.expand_or_jump()
     return ""
 endfunction
 
 function! UltiSnips#ListSnippets() abort
-    exec g:_uspy "UltiSnips_Manager.list_snippets()"
+    py3 UltiSnips_Manager.list_snippets()
     return ""
 endfunction
 
@@ -90,69 +90,69 @@ function! UltiSnips#SnippetsInCurrentScope(...) abort
     if all
       let g:current_ulti_dict_info = {}
     endif
-    exec g:_uspy "UltiSnips_Manager.snippets_in_current_scope(" . all . ")"
+    py3 UltiSnips_Manager.snippets_in_current_scope(int(vim.eval("all")))
     return g:current_ulti_dict
 endfunction
 
 function! UltiSnips#SaveLastVisualSelection() range abort
-    exec g:_uspy "UltiSnips_Manager._save_last_visual_selection()"
+    py3 UltiSnips_Manager._save_last_visual_selection()
     return ""
 endfunction
 
 function! UltiSnips#JumpBackwards() abort
     call s:compensate_for_pum()
-    exec g:_uspy "UltiSnips_Manager.jump_backwards()"
+    py3 UltiSnips_Manager.jump_backwards()
     return ""
 endfunction
 
 function! UltiSnips#JumpForwards() abort
     call s:compensate_for_pum()
-    exec g:_uspy "UltiSnips_Manager.jump_forwards()"
+    py3 UltiSnips_Manager.jump_forwards()
     return ""
 endfunction
 
 function! UltiSnips#AddSnippetWithPriority(trigger, value, description, options, filetype, priority) abort
-    exec g:_uspy "trigger = vim.eval(\"a:trigger\")"
-    exec g:_uspy "value = vim.eval(\"a:value\")"
-    exec g:_uspy "description = vim.eval(\"a:description\")"
-    exec g:_uspy "options = vim.eval(\"a:options\")"
-    exec g:_uspy "filetype = vim.eval(\"a:filetype\")"
-    exec g:_uspy "priority = vim.eval(\"a:priority\")"
-    exec g:_uspy "UltiSnips_Manager.add_snippet(trigger, value, description, options, filetype, priority)"
+    py3 trigger = vim.eval("a:trigger")
+    py3 value = vim.eval("a:value")
+    py3 description = vim.eval("a:description")
+    py3 options = vim.eval("a:options")
+    py3 filetype = vim.eval("a:filetype")
+    py3 priority = vim.eval("a:priority")
+    py3 UltiSnips_Manager.add_snippet(trigger, value, description, options, filetype, priority)
     return ""
 endfunction
 
 function! UltiSnips#Anon(value, ...) abort
     " Takes the same arguments as SnippetManager.expand_anon:
     " (value, trigger="", description="", options="")
-    exec g:_uspy "args = vim.eval(\"a:000\")"
-    exec g:_uspy "value = vim.eval(\"a:value\")"
-    exec g:_uspy "UltiSnips_Manager.expand_anon(value, *args)"
+    py3 args = vim.eval("a:000")
+    py3 value = vim.eval("a:value")
+    py3 UltiSnips_Manager.expand_anon(value, *args)
     return ""
 endfunction
 
 function! UltiSnips#CursorMoved() abort
-    exec g:_uspy "UltiSnips_Manager._cursor_moved()"
+    py3 UltiSnips_Manager._cursor_moved()
 endf
 
 function! UltiSnips#LeavingBuffer() abort
     let from_preview = getwinvar(winnr('#'), '&previewwindow')
     let to_preview = getwinvar(winnr(), '&previewwindow')
 
     if !(from_preview || to_preview)
-        exec g:_uspy "UltiSnips_Manager._leaving_buffer()"
+        py3 UltiSnips_Manager._leaving_buffer()
     endif
 endf
 
 function! UltiSnips#LeavingInsertMode() abort
-    exec g:_uspy "UltiSnips_Manager._leaving_insert_mode()"
+    py3 UltiSnips_Manager._leaving_insert_mode()
 endfunction
 
 function! UltiSnips#TrackChange() abort
-    exec g:_uspy "UltiSnips_Manager._track_change()"
+    py3 UltiSnips_Manager._track_change()
 endfunction
 
 function! UltiSnips#RefreshSnippets() abort
-    exec g:_uspy "UltiSnips_Manager._refresh_snippets()"
+    py3 UltiSnips_Manager._refresh_snippets()
 endfunction
 " }}}

Diff for: autoload/UltiSnips/map_keys.vim

@@ -1,4 +1,4 @@
-if exists("b:did_autoload_ultisnips_map_keys") || !exists("g:_uspy")
+if exists("b:did_autoload_ultisnips_map_keys")
    finish
 endif
 let b:did_autoload_ultisnips_map_keys = 1

Diff for: doc/UltiSnips.txt

@@ -58,7 +58,7 @@ UltiSnips                                      *snippet* *snippets* *UltiSnips*
 
 This plugin only works if 'compatible' is not set.
 {Vi does not have any of these features}
-{only available when |+python| or |+python3| have been enabled at compile time}
+{only available when |+python3| has been enabled at compile time}
 
 
 ==============================================================================
@@ -89,22 +89,14 @@ http://vimcasts.org/episodes/ultisnips-visual-placeholder/
 1.1 Requirements                                     *UltiSnips-requirements*
 ----------------
 
-This plugin works with Vim version 7.4 or later. It only works if the
-'compatible' setting is not set.
+This plugin works with Vim version 7.4 or later with Python 3 support enabled.
+It only works if the 'compatible' setting is not set.
 
-This plugin is tested against Python 2.7 and 3.6 in Vim 7.4 and 8. All other
-combinations are unsupported, but might work.
-
-The Python 2.x or Python 3.x interface must be available. In other words, Vim
-must be compiled with either the |+python| feature or the |+python3| feature.
+The Python 3.x interface must be available. In other words, Vim
+must be compiled with the |+python3| feature.
 The following commands show how to test if you have python compiled in Vim.
 They print '1' if the python version is compiled in, '0' if not.
 
-Test if Vim is compiled with python version 2.x: >
-    :echo has("python")
-The python version Vim is linked against can be found with: >
-    :py import sys; print(sys.version)
-
 Test if Vim is compiled with python version 3.x: >
     :echo has("python3")
 The python version Vim is linked against can be found with: >
@@ -113,17 +105,6 @@ The python version Vim is linked against can be found with: >
 Note that Vim is maybe not using your system-wide installed python version, so
 make sure to check the Python version inside of Vim.
 
-UltiSnips attempts to auto-detect which python version is compiled into Vim.
-Unfortunately, in some versions of Vim this detection does not work.
-In that case you have to explicitly tell UltiSnips which version to use using
-the 'UltiSnipsUsePythonVersion' global variable.
-
-To use python version 2.x: >
-   let g:UltiSnipsUsePythonVersion = 2
-
-To use python version 3.x: >
-   let g:UltiSnipsUsePythonVersion = 3
-
 
 1.2 Acknowledgments                               *UltiSnips-acknowledgments*
 -------------------

Diff for: docker/build_vim.sh

@@ -5,22 +5,19 @@ set -o verbose
 
 cd /src/vim
 
-if [[ $PYTHON_VERSION =~ ^2\. ]]; then
-   PYTHON_BUILD_CONFIG="--enable-pythoninterp"
-else
-   PYTHON_BUILD_CONFIG="--enable-python3interp"
-fi
+PYTHON_BUILD_CONFIG="--enable-python3interp"
 
 export CFLAGS="$(python-config --cflags)"
 echo $CFLAGS
 ./configure \
+   --disable-gpm \
    --disable-nls \
    --disable-sysmouse \
-   --disable-gpm \
    --enable-gui=no \
    --enable-multibyte \
+   --enable-python3interp \
    --with-features=huge \
    --with-tlib=ncurses \
    --without-x \
-   $PYTHON_BUILD_CONFIG || cat $(find . -name 'config.log')
+   || cat $(find . -name 'config.log')
 make install

Diff for: mypy.ini

@@ -4,6 +4,7 @@
 python_version = 3.7
 warn_return_any = True
 warn_unused_configs = True
+mypy_path=pythonx/UltiSnips
 
 [mypy-vim]
 ignore_missing_imports = True

Diff for: plugin/UltiSnips.vim

@@ -10,36 +10,6 @@ if version < 704
    finish
 endif
 
-if !exists("g:UltiSnipsUsePythonVersion")
-   let g:_uspy=":py3 "
-   if !has("python3")
-       if !has("python")
-           if !exists("g:UltiSnipsNoPythonWarning")
-               echohl WarningMsg
-               echom  "UltiSnips requires py >= 2.7 or py3"
-               echohl None
-           endif
-           unlet g:_uspy
-           finish
-       endif
-       let g:_uspy=":py "
-   endif
-else
-   " Use user-provided value, but check if it's available.
-   " This uses `has()`, because e.g. `exists(":python3")` is always 2.
-   if g:UltiSnipsUsePythonVersion == 2 && has('python')
-       let g:_uspy=":python "
-   elseif g:UltiSnipsUsePythonVersion == 3 && has('python3')
-       let g:_uspy=":python3 "
-   endif
-   if !exists('g:_uspy')
-       echohl WarningMsg
-       echom  "UltiSnips: the Python version from g:UltiSnipsUsePythonVersion (".g:UltiSnipsUsePythonVersion.") is not available."
-       echohl None
-       finish
-   endif
-endif
-
 " The Commands we define.
 command! -bang -nargs=? -complete=customlist,UltiSnips#FileTypeComplete UltiSnipsEdit
     \ :call UltiSnips#Edit(<q-bang>, <q-args>)

Diff for: pylintrc

@@ -48,8 +48,7 @@ disable=
    too-many-locals,
    too-many-public-methods, 
    too-many-return-statements,
-   too-many-statements,
-   useless-object-inheritance,
+   too-many-statements
 
 
 
@@ -145,12 +144,6 @@ max-module-lines=1000
 indent-string='    '
 
 
-[MISCELLANEOUS]
-
-# List of note tags to take in consideration, separated by a comma.
-notes=TODO
-
-
 [SIMILARITIES]
 
 # Minimum lines number of a similarity.

Diff for: pythonx/UltiSnips/buffer_proxy.py

@@ -2,7 +2,6 @@
 
 import vim
 from UltiSnips import vim_helper
-from UltiSnips.compatibility import as_unicode, as_vimencoding
 from UltiSnips.position import Position
 from UltiSnips.diff import diff
 
@@ -96,11 +95,11 @@ def __setitem__(self, key, value):
         changes and applies them to the current snippet stack.
         """
         if isinstance(key, slice):
-            value = [as_vimencoding(line) for line in value]
+            value = [line for line in value]
             changes = list(self._get_diff(key.start, key.stop, value))
             self._buffer[key.start : key.stop] = [line.strip("\n") for line in value]
         else:
-            value = as_vimencoding(value)
+            value = value
             changes = list(self._get_line_diff(key, self._buffer[key], value))
             self._buffer[key] = value
 
@@ -122,10 +121,7 @@ def __getitem__(self, key):
         """
         Just passing call to the vim.current.window.buffer.__getitem__.
         """
-        if isinstance(key, slice):
-            return [as_unicode(l) for l in self._buffer[key.start : key.stop]]
-        else:
-            return as_unicode(self._buffer[key])
+        return self._buffer[key]
 
     def __getslice__(self, i, j):
         """
@@ -147,7 +143,7 @@ def append(self, line, line_number=-1):
             line_number = len(self)
         if not isinstance(line, list):
             line = [line]
-        self[line_number:line_number] = [as_vimencoding(l) for l in line]
+        self[line_number:line_number] = [l for l in line]
 
     def __delitem__(self, key):
         if isinstance(key, slice):