brew missing: allow a formula argument

If a formula is given, it will be checked for missing deps.
The formula does not have to be installed first.

Without a formula list, still checks all installed brews.

3 files changed, 23 insertions, 10 deletions

diff --git a/Library/Contributions/brew_bash_completion.sh b/Library/Contributions/brew_bash_completion.sh
index 7513e3c4f..c4aeeaf84 100644
--- a/Library/Contributions/brew_bash_completion.sh
+++ b/Library/Contributions/brew_bash_completion.sh
@@ -28,7 +28,7 @@ _brew_to_completion()
 
     case "$prev" in
     # Commands that take a formula
-    cat|deps|edit|fetch|home|homepage|info|install|log|options|uses)
+    cat|deps|edit|fetch|home|homepage|info|install|log|missing|options|uses)
         # handle standard --options
         if [[ "$prev" == "install" && "$cur" == --* ]]; then
             local opts=$(
diff --git a/Library/Contributions/examples/brew-missing.rb b/Library/Contributions/examples/brew-missing.rb
index 701bb1ca2..5beca3c92 100755
--- a/Library/Contributions/examples/brew-missing.rb
+++ b/Library/Contributions/examples/brew-missing.rb
@@ -1,18 +1,29 @@
 require "formula"
 require "cmd/outdated"
 
+def installed_brews
+  formulae = []
+  HOMEBREW_CELLAR.subdirs.each do |rack|
+    f = Formula.factory rack.basename.to_s rescue nil
+    formulae << f if f and f.installed?
+  end
+  formulae
+end
+
 def main
   # Names of outdated brews; they count as installed.
   outdated = Homebrew.outdated_brews.collect{ |b| b[1] }
 
-  HOMEBREW_CELLAR.subdirs.each do |rack|
-    f = Formula.factory rack.basename.to_s rescue nil
-    if f and f.installed?
-      missing_deps = f.recursive_deps.map{ |g| g.name }.uniq.reject do |dep_name|
-        Formula.factory(dep_name).installed? or outdated.include?(dep_name)
-      end
+  formuale_to_check = ARGV.formulae rescue installed_brews
+
+  formuale_to_check.each do |f|
+    missing_deps = f.recursive_deps.map{ |g| g.name }.uniq.reject do |dep_name|
+      Formula.factory(dep_name).installed? or outdated.include?(dep_name)
+    end
 
-      puts "#{f.name}: #{missing_deps * ', '}" unless missing_deps.empty?
+    unless missing_deps.empty?
+      print "#{f.name}: " if formuale_to_check.size > 1
+      puts "#{missing_deps * ', '}"
     end
   end
 end
diff --git a/Library/Contributions/manpages/brew.1.md b/Library/Contributions/manpages/brew.1.md
index f65168bef..409eab697 100644
--- a/Library/Contributions/manpages/brew.1.md
+++ b/Library/Contributions/manpages/brew.1.md
@@ -179,8 +179,10 @@ didn't include with OS X.
 
     If `--all` is passed, show options for all formulae.
 
-  * `missing`:
-    Check all installed formuale for missing dependencies.
+  * `missing` [<formulae>]:
+    Check the given <formulae> for missing dependencies.
+
+    If no <formulae> are given, check all installed brews.
 
   * `server`:
     Start a local web app that lets you browse available formulae, similar