Speed up brew --prefix

Move --prefix, --cellar to the top of brew.sh. Timings on master:

    brew --prefix > /dev/null  0.05s user 0.03s system 46% cpu 0.165 total
    brew --prefix > /dev/null  0.05s user 0.04s system 63% cpu 0.131 total
    brew --prefix > /dev/null  0.04s user 0.03s system 72% cpu 0.104 total
    brew --prefix > /dev/null  0.04s user 0.03s system 87% cpu 0.080 total
    brew --prefix > /dev/null  0.04s user 0.03s system 81% cpu 0.080 total
    brew --prefix > /dev/null  0.04s user 0.03s system 84% cpu 0.075 total
    brew --prefix > /dev/null  0.04s user 0.03s system 83% cpu 0.080 total
    brew --prefix > /dev/null  0.04s user 0.02s system 84% cpu 0.072 total
    brew --prefix > /dev/null  0.04s user 0.03s system 86% cpu 0.072 total
    brew --prefix > /dev/null  0.04s user 0.03s system 82% cpu 0.075 total
    brew --prefix > /dev/null  0.04s user 0.03s system 85% cpu 0.072 total
    brew --prefix > /dev/null  0.04s user 0.03s system 84% cpu 0.076 total
    brew --prefix > /dev/null  0.04s user 0.03s system 85% cpu 0.074 total
    brew --prefix > /dev/null  0.03s user 0.03s system 83% cpu 0.073 total
    brew --prefix > /dev/null  0.04s user 0.02s system 83% cpu 0.072 total
    brew --prefix > /dev/null  0.03s user 0.03s system 86% cpu 0.068 total
    brew --prefix > /dev/null  0.04s user 0.03s system 82% cpu 0.080 total
    brew --prefix > /dev/null  0.04s user 0.03s system 84% cpu 0.079 total
    brew --prefix > /dev/null  0.04s user 0.02s system 83% cpu 0.070 total
    brew --prefix > /dev/null  0.03s user 0.03s system 84% cpu 0.072 total

With the patch applied:

    brew --prefix > /dev/null  0.02s user 0.02s system 24% cpu 0.157 total
    brew --prefix > /dev/null  0.02s user 0.03s system 53% cpu 0.078 total
    brew --prefix > /dev/null  0.02s user 0.02s system 64% cpu 0.056 total
    brew --prefix > /dev/null  0.02s user 0.03s system 74% cpu 0.065 total
    brew --prefix > /dev/null  0.01s user 0.02s system 73% cpu 0.049 total
    brew --prefix > /dev/null  0.01s user 0.02s system 77% cpu 0.050 total
    brew --prefix > /dev/null  0.01s user 0.02s system 64% cpu 0.054 total
    brew --prefix > /dev/null  0.01s user 0.02s system 77% cpu 0.049 total
    brew --prefix > /dev/null  0.01s user 0.02s system 56% cpu 0.061 total
    brew --prefix > /dev/null  0.02s user 0.02s system 66% cpu 0.060 total
    brew --prefix > /dev/null  0.01s user 0.02s system 62% cpu 0.057 total
    brew --prefix > /dev/null  0.01s user 0.02s system 71% cpu 0.052 total
    brew --prefix > /dev/null  0.02s user 0.03s system 67% cpu 0.063 total
    brew --prefix > /dev/null  0.01s user 0.02s system 70% cpu 0.042 total
    brew --prefix > /dev/null  0.02s user 0.02s system 68% cpu 0.056 total
    brew --prefix > /dev/null  0.01s user 0.02s system 73% cpu 0.049 total
    brew --prefix > /dev/null  0.01s user 0.02s system 62% cpu 0.058 total
    brew --prefix > /dev/null  0.02s user 0.02s system 67% cpu 0.058 total
    brew --prefix > /dev/null  0.01s user 0.02s system 73% cpu 0.043 total
    brew --prefix > /dev/null  0.01s user 0.02s system 65% cpu 0.055 total

1 files changed, 21 insertions, 21 deletions

diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index 638e9dc19..bec742ffa 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -1,3 +1,24 @@
+# Force UTF-8 to avoid encoding issues for users with broken locale settings.
+if [[ "$(locale charmap 2>/dev/null)" != "UTF-8" ]]
+then
+  export LC_ALL="en_US.UTF-8"
+fi
+
+# Where we store built products; a Cellar in HOMEBREW_PREFIX (often /usr/local
+# for bottles) unless there's already a Cellar in HOMEBREW_REPOSITORY.
+if [[ -d "$HOMEBREW_REPOSITORY/Cellar" ]]
+then
+  HOMEBREW_CELLAR="$HOMEBREW_REPOSITORY/Cellar"
+else
+  HOMEBREW_CELLAR="$HOMEBREW_PREFIX/Cellar"
+fi
+
+case "$*" in
+  --prefix)            echo "$HOMEBREW_PREFIX"; exit 0 ;;
+  --cellar)            echo "$HOMEBREW_CELLAR"; exit 0 ;;
+  --repository|--repo) echo "$HOMEBREW_REPOSITORY"; exit 0 ;;
+esac
+
 HOMEBREW_VERSION="$(git -C "$HOMEBREW_REPOSITORY" describe --tags --dirty --abbrev=7 2>/dev/null)"
 HOMEBREW_USER_AGENT_VERSION="$HOMEBREW_VERSION"
 if [[ -z "$HOMEBREW_VERSION" ]]
@@ -42,27 +63,6 @@ git() {
   "$HOMEBREW_LIBRARY/Homebrew/shims/scm/git" "$@"
 }
 
-# Force UTF-8 to avoid encoding issues for users with broken locale settings.
-if [[ "$(locale charmap 2>/dev/null)" != "UTF-8" ]]
-then
-  export LC_ALL="en_US.UTF-8"
-fi
-
-# Where we store built products; a Cellar in HOMEBREW_PREFIX (often /usr/local
-# for bottles) unless there's already a Cellar in HOMEBREW_REPOSITORY.
-if [[ -d "$HOMEBREW_REPOSITORY/Cellar" ]]
-then
-  HOMEBREW_CELLAR="$HOMEBREW_REPOSITORY/Cellar"
-else
-  HOMEBREW_CELLAR="$HOMEBREW_PREFIX/Cellar"
-fi
-
-case "$*" in
-  --prefix)            echo "$HOMEBREW_PREFIX"; exit 0 ;;
-  --cellar)            echo "$HOMEBREW_CELLAR"; exit 0 ;;
-  --repository|--repo) echo "$HOMEBREW_REPOSITORY"; exit 0 ;;
-esac
-
 if [[ "$HOMEBREW_PREFIX" = "/" || "$HOMEBREW_PREFIX" = "/usr" ]]
 then
   # it may work, but I only see pain this route and don't want to support it