Python 3 が /usr/local/bin/python に配置されるようになった Homebrew で NeoVim の :CheckHealth をパスさせる

いつの間にか Homebrew の /usr/local/bin/python が python3 になってました。中々気合が入っている変更ですね。
私は Python そのものはあまり使わないのですが、 Neovim が使っているのでいろいろと調整したログ。

さて、この変更がある前の Neovim + Python 周りをまとめると

• $ brew install python
• python 2 系が入る
• $ pip2 install neovim
• pip2 は /usr/local/bin/pip2
• $ brew install python3
• python 3 系が入る
• $ pip3 install neovim
• pip3 は /usr/local/bin/pip3

といった感じだったのですが、変更後は

• $ brew install python
• python 3 系が入る
• pip3 は /usr/local/bin/pip
• $ brew install python@2
• python 2 系が入る
• が、keg-only の formula 。
• python2 や pip2 を使うには  /usr/local/opt/python@2/ などに PATH を通す必要がある
• 詳しくは $ brew info python@2 

という形になっているようです。

keg-only の formula を使い続けると混乱しそうなので、python@2 はアンインストール。

Python 2 系は system builtin のものを使うことにしました。

root で書き込む必要があるのでしくじった時のダメージが大きいですが……

ということで

• $ brew uninstall python@2
• $ sudo easy_install-2.7 neovim

して解決。

具体的な :CheckHealth の結果は

• before

	health#deoplete#check
	========================================================================
	## deoplete.nvim
	- OK: has("nvim") was successful
	- OK: exists("v:t_list") was successful
	- OK: has("python3") was successful
	- INFO: If you're still having problems, try the following commands:
	$ export NVIM_PYTHON_LOG_FILE=/tmp/log
	$ export NVIM_PYTHON_LOG_LEVEL=DEBUG
	$ nvim
	$ cat /tmp/log_{PID}
	and then create an issue on github
	health#nvim#check
	========================================================================
	## Configuration
	- OK: no issues found
	## Performance
	- OK: Build type: Release
	## Remote Plugins
	- OK: Up to date
	## terminal
	- INFO: key_backspace (kbs) terminfo entry: key_backspace=^H
	- INFO: key_dc (kdch1) terminfo entry: key_dc=\E[3~
	- INFO: $XTERM_VERSION=''
	- INFO: $VTE_VERSION=''
	- INFO: $COLORTERM=''
	- INFO: $SSH_TTY=''
	health#provider#check
	========================================================================
	## Clipboard (optional)
	- OK: Clipboard tool found: pbcopy
	## Python 2 provider (optional)
	- WARNING: No Python interpreter was found with the neovim module. Using the first available for diagnostics.
	- WARNING: provider/pythonx: Could not load Python 2:
	python2 not found in search path or not executable.
	/usr/bin/python2.7 does not have the "neovim" module. :help |provider-python|
	/usr/bin/python2.6 does not have the "neovim" module. :help |provider-python|
	/usr/local/bin/python is Python 3.6 and cannot provide Python 2.
	- ERROR: Python provider error
	- ADVICE:
	- provider/pythonx: Could not load Python 2:
	python2 not found in search path or not executable.
	/usr/bin/python2.7 does not have the "neovim" module. :help |provider-python|
	/usr/bin/python2.6 does not have the "neovim" module. :help |provider-python|
	/usr/local/bin/python is Python 3.6 and cannot provide Python 2.
	- INFO: Executable: Not found
	## Python 3 provider (optional)
	- INFO: `g:python3_host_prog` is not set. Searching for python3 in the environment.
	- INFO: Executable: /usr/local/bin/python3
	- INFO: Python3 version: 3.6.4
	- INFO: python3-neovim version: 0.2.3
	- OK: Latest python3-neovim is installed: 0.2.3
	## Ruby provider (optional)
	- INFO: Ruby: ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin16]
	- INFO: Host: /Users/atton/.rbenv/shims/neovim-ruby-host
	- OK: Latest "neovim" gem is installed: 0.6.2
	## Node provider (optional)
	- INFO: Node: v9.7.1
	- INFO: Host: /usr/local/bin/neovim-node-host
	- OK: Latest "neovim" npm is installed: 3.5.2

view raw neovim_check_health_before.txt hosted with ❤ by GitHub
• after

	health#deoplete#check
	========================================================================
	## deoplete.nvim
	- OK: has("nvim") was successful
	- OK: exists("v:t_list") was successful
	- OK: has("python3") was successful
	- INFO: If you're still having problems, try the following commands:
	$ export NVIM_PYTHON_LOG_FILE=/tmp/log
	$ export NVIM_PYTHON_LOG_LEVEL=DEBUG
	$ nvim
	$ cat /tmp/log_{PID}
	and then create an issue on github
	health#nvim#check
	========================================================================
	## Configuration
	- OK: no issues found
	## Performance
	- OK: Build type: Release
	## Remote Plugins
	- OK: Up to date
	## terminal
	- INFO: key_backspace (kbs) terminfo entry: key_backspace=^H
	- INFO: key_dc (kdch1) terminfo entry: key_dc=\E[3~
	- INFO: $XTERM_VERSION=''
	- INFO: $VTE_VERSION=''
	- INFO: $COLORTERM=''
	- INFO: $SSH_TTY=''
	health#provider#check
	========================================================================
	## Clipboard (optional)
	- OK: Clipboard tool found: pbcopy
	## Python 2 provider (optional)
	- INFO: `g:python_host_prog` is not set. Searching for python2.7 in the environment.
	- INFO: Executable: /usr/bin/python2.7
	- INFO: Python2 version: 2.7.10
	- INFO: python2.7-neovim version: 0.2.3
	- OK: Latest python2.7-neovim is installed: 0.2.3
	## Python 3 provider (optional)
	- INFO: `g:python3_host_prog` is not set. Searching for python3 in the environment.
	- INFO: Executable: /usr/local/bin/python3
	- INFO: Python3 version: 3.6.4
	- INFO: python3-neovim version: 0.2.3
	- OK: Latest python3-neovim is installed: 0.2.3
	## Ruby provider (optional)
	- INFO: Ruby: ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin16]
	- INFO: Host: /Users/atton/.rbenv/shims/neovim-ruby-host
	- OK: Latest "neovim" gem is installed: 0.6.2
	## Node provider (optional)
	- INFO: Node: v9.7.1
	- INFO: Host: /usr/local/bin/neovim-node-host
	- OK: Latest "neovim" npm is installed: 3.5.2

view raw neovim_check_health_after.txt hosted with ❤ by GitHub

といった感じです。:CheckHealth 便利。

環境

• macOS: 10.12.6
• Homebrew: 1.5.7
• Homebrew/homebrew-core (git revision b33d4d; last commit 2018-03-03)
• NeoVim: 0.2.2
• python2.7: 2.7.10 (macOS provided)
• python: 3.6.4 (Homebrew provided)