Added '--installed' option to `deps` command.

When deps command is passed this option, it will only show the dependencies
for the installed forumas. This option overrides the '--all' option.

Closes Homebrew/homebrew#18276.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

2 files changed, 6 insertions, 2 deletions

diff --git a/Library/Contributions/manpages/brew.1.md b/Library/Contributions/manpages/brew.1.md
index ca45427ee..93df07341 100644
--- a/Library/Contributions/manpages/brew.1.md
+++ b/Library/Contributions/manpages/brew.1.md
@@ -78,7 +78,7 @@ Note that these flags should only appear after a command.
     The options `--set-name` and `--set-version` each take an argument and allow
     you to explicitly set the name and version of the package you are creating.
 
-  * `deps [--1] [-n] [--tree] [--all]` <formula>:
+  * `deps [--1] [-n] [--tree] [--all] [--installed]` <formula>:
     Show <formula>'s dependencies.
 
     If `--1` is passed, only show dependencies one level down, instead of
diff --git a/Library/Homebrew/cmd/deps.rb b/Library/Homebrew/cmd/deps.rb
index 7e426f91f..9e6d450f3 100644
--- a/Library/Homebrew/cmd/deps.rb
+++ b/Library/Homebrew/cmd/deps.rb
@@ -9,7 +9,11 @@ end
 
 module Homebrew extend self
   def deps
-    if ARGV.include? '--all'
+    if ARGV.include? '--installed'
+        Formula.installed.each do |f|
+          puts "#{f.name}: #{f.deps*' '}"
+        end
+    elsif ARGV.include? '--all'
       Formula.each do |f|
         puts "#{f.name}: #{f.deps*' '}"
       end