diff --git a/Library/Homebrew/cmd/casks.sh b/Library/Homebrew/cmd/casks.sh
index 64113d1f4a..4a8d866f45 100644
--- a/Library/Homebrew/cmd/casks.sh
+++ b/Library/Homebrew/cmd/casks.sh
@@ -3,27 +3,8 @@
 #:  List all locally installable casks including short names.
 #:
 
+source "$HOMEBREW_LIBRARY/Homebrew/items.sh"
+
 homebrew-casks() {
-  local casks
-  local sed_extended_regex_flag
-
-  if [[ -n "$HOMEBREW_MACOS" ]]; then
-    sed_extended_regex_flag="-E"
-  else
-    sed_extended_regex_flag="-r"
-  fi
-
-  casks="$( \
-    find "$HOMEBREW_REPOSITORY/Library/Taps" \
-         -maxdepth 4 -path '*/Casks/*.rb' | \
-    sed "$sed_extended_regex_flag" \
-      -e 's/\.rb//g' \
-      -e 's_.*/Taps/(.*)/(home|linux)brew-_\1/_' \
-      -e 's|/Casks/|/|' \
-  )"
-  local shortnames
-  shortnames="$(echo "$casks" | cut -d "/" -f 3)"
-  echo -e "$casks\n$shortnames" | \
-    grep -v '^homebrew/cask' | \
-    sort -uf
+  homebrew-items 'Formula' 's|/Casks/|/|' '^homebrew/cask'
 }
diff --git a/Library/Homebrew/cmd/formulae.sh b/Library/Homebrew/cmd/formulae.sh
index e2f803724d..eee27c9629 100644
--- a/Library/Homebrew/cmd/formulae.sh
+++ b/Library/Homebrew/cmd/formulae.sh
@@ -3,35 +3,8 @@
 #:  List all locally installable formulae including short names.
 #:
 
+source "$HOMEBREW_LIBRARY/Homebrew/items.sh"
+
 homebrew-formulae() {
-  local formulae
-  local sed_extended_regex_flag
-
-  if [[ -n "$HOMEBREW_MACOS" ]]; then
-    sed_extended_regex_flag="-E"
-  else
-    sed_extended_regex_flag="-r"
-  fi
-
-  formulae="$( \
-    find "$HOMEBREW_REPOSITORY/Library/Taps" \
-         -type d \( \
-           -name Casks -o \
-           -name cmd -o \
-           -name .github -o \
-           -name lib -o \
-           -name spec -o \
-           -name vendor \
-          \) \
-         -prune -false -o -name '*\.rb' | \
-    sed "$sed_extended_regex_flag" \
-      -e 's/\.rb//g' \
-      -e 's_.*/Taps/(.*)/(home|linux)brew-_\1/_' \
-      -e 's|/Formula/|/|' \
-  )"
-  local shortnames
-  shortnames="$(echo "$formulae" | cut -d "/" -f 3)"
-  echo -e "$formulae\n$shortnames" | \
-    grep -v '^homebrew/core' | \
-    sort -uf
+  homebrew-items 'Casks' 's|/Formula/|/|' '^homebrew/core'
 }
diff --git a/Library/Homebrew/items.sh b/Library/Homebrew/items.sh
new file mode 100644
index 0000000000..6edf44dfc6
--- /dev/null
+++ b/Library/Homebrew/items.sh
@@ -0,0 +1,35 @@
+homebrew-items() {
+  local items
+  local sed_extended_regex_flag
+  local find_filter=$1
+  local sed_filter=$2
+  local grep_filter=$3
+
+  if [[ -n "$HOMEBREW_MACOS" ]]; then
+    sed_extended_regex_flag="-E"
+  else
+    sed_extended_regex_flag="-r"
+  fi
+
+  items="$( \
+    find "$HOMEBREW_REPOSITORY/Library/Taps" \
+         -type d \( \
+           -name $find_filter -o \
+           -name cmd -o \
+           -name .github -o \
+           -name lib -o \
+           -name spec -o \
+           -name vendor \
+          \) \
+         -prune -false -o -name '*\.rb' | \
+    sed "$sed_extended_regex_flag" \
+      -e 's/\.rb//g' \
+      -e 's_.*/Taps/(.*)/(home|linux)brew-_\1/_' \
+      -e $sed_filter \
+  )"
+  local shortnames
+  shortnames="$(echo "$items" | cut -d "/" -f 3)"
+  echo -e "$items\n$shortnames" | \
+    grep -v $grep_filter | \
+    sort -uf
+}