From 8bac95899491cc043a40b274be224236a8224483 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mislav=20Marohni=C4=87?= <mislav.marohnic@gmail.com>
Date: Sat, 4 Jan 2014 16:37:20 +0100
Subject: [PATCH] Stop using `abs_dirname()` in rbenv-init

It's slow and not necessary since we expect `$0` to already be expanded.

In tests this change forces us to deal with some relative paths, but
it's not a big deal. The `rbenv init -` output in the most common case
will be the same as before:

    source '/home/myuser/.rbenv/libexec/../completions/rbenv.bash'
---
 libexec/rbenv-init | 26 +-------------------------
 test/init.bats     |  4 ++--
 2 files changed, 3 insertions(+), 27 deletions(-)

diff --git a/libexec/rbenv-init b/libexec/rbenv-init
index 5f9079a7..8718c116 100755
--- a/libexec/rbenv-init
+++ b/libexec/rbenv-init
@@ -28,31 +28,7 @@ if [ -z "$shell" ]; then
   shell="$(basename "${shell:-$SHELL}")"
 fi
 
-READLINK=$(type -p greadlink readlink | head -1)
-if [ -z "$READLINK" ]; then
-  echo "rbenv: cannot find readlink - are you missing GNU coreutils?" >&2
-  exit 1
-fi
-
-resolve_link() {
-  $READLINK "$1"
-}
-
-abs_dirname() {
-  local cwd="$(pwd)"
-  local path="$1"
-
-  while [ -n "$path" ]; do
-    cd "${path%/*}"
-    local name="${path##*/}"
-    path="$(resolve_link "$name" || true)"
-  done
-
-  pwd
-  cd "$cwd"
-}
-
-root="$(abs_dirname "$0")/.."
+root="${0%/*}/.."
 
 if [ -z "$print" ]; then
   case "$shell" in
diff --git a/test/init.bats b/test/init.bats
index aa50f091..2587a014 100644
--- a/test/init.bats
+++ b/test/init.bats
@@ -21,7 +21,7 @@ load test_helper
   root="$(cd $BATS_TEST_DIRNAME/.. && pwd)"
   run rbenv-init - bash
   assert_success
-  assert_line "source '${root}/libexec/../completions/rbenv.bash'"
+  assert_line "source '${root}/test/../libexec/../completions/rbenv.bash'"
 }
 
 @test "detect parent shell" {
@@ -35,7 +35,7 @@ load test_helper
   root="$(cd $BATS_TEST_DIRNAME/.. && pwd)"
   run rbenv-init - fish
   assert_success
-  assert_line ". '${root}/libexec/../completions/rbenv.fish'"
+  assert_line ". '${root}/test/../libexec/../completions/rbenv.fish'"
 }
 
 @test "fish instructions" {