From d8559b97499cfa979f9a28d44d05ae6fdf7e914a Mon Sep 17 00:00:00 2001
From: "Yamashita, Yuu" <peek824545201@gmail.com>
Date: Mon, 15 Aug 2016 05:30:18 +0000
Subject: [PATCH] Workaround for performance issue with `conda.txt`

The performance issue must be caused by too many I/O requests to
`conda.txt` from fgrep. This inline expansion should work to reduce # of
read to the `conda.txt`.

original performance:

```
% git rev-parse HEAD
4f76be6a129a7281a41780783eefdab3ec472a40
% time bash -c 'pyenv rehash'
bash -c 'pyenv rehash'  0.05s user 0.02s system 76% cpu 0.089 total
```

previous commit: ==> 4x slower than original

```
% git rev-parse HEAD
4469d51ef7bb3e2907f5a363bb97d92896628527
% time bash -c 'pyenv rehash'
bash -c 'pyenv rehash'  0.06s user 0.03s system 25% cpu 0.358 total
```

with this workaround: ==> almost same as original

```
% git rev-parse HEAD
3ffe91bdbc69220eaecf6e2088229cc27366c3f3
% time bash -c 'pyenv rehash'
bash -c 'pyenv rehash'  0.05s user 0.00s system 68% cpu 0.082 total
```
---
 pyenv.d/rehash/conda.bash | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/pyenv.d/rehash/conda.bash b/pyenv.d/rehash/conda.bash
index 9af7d0ee..a7ecf4ea 100644
--- a/pyenv.d/rehash/conda.bash
+++ b/pyenv.d/rehash/conda.bash
@@ -11,9 +11,13 @@ conda_exists() {
   [ -n "${condas}" ]
 }
 
-conda_shim() {
-  sed -e 's/#.*//' "${BASH_SOURCE%/*}/conda.txt" | fgrep -q -x "${1##*/}"
-}
+shims=()
+for shim in $(cat "${BASH_SOURCE%/*}/conda.txt"); do
+  if [ -n "${shim%%#*}" ]; then
+    shims[${#shims[*]}]="${shim})return 0;;"
+  fi
+done
+eval "conda_shim(){ case \"\$1\" in ${shims[@]} *)return 1;;esac;}"
 
 # override `make_shims` to avoid conflict between pyenv-virtualenv's `envs.bash`
 # https://github.com/yyuu/pyenv-virtualenv/blob/v20160716/etc/pyenv.d/rehash/envs.bash