add --installed to json info

Closes Homebrew/homebrew#29315.

4 files changed, 14 insertions, 4 deletions

diff --git a/Library/Contributions/brew_bash_completion.sh b/Library/Contributions/brew_bash_completion.sh
index 61c81361f..7d3fc595f 100644
--- a/Library/Contributions/brew_bash_completion.sh
+++ b/Library/Contributions/brew_bash_completion.sh
@@ -222,7 +222,7 @@ _brew_info ()
     local cur="${COMP_WORDS[COMP_CWORD]}"
     case "$cur" in
     --*)
-        __brewcomp "--all --github --json=v1"
+        __brewcomp "--all --github --installed --json=v1"
         return
         ;;
     esac
diff --git a/Library/Contributions/manpages/brew.1.md b/Library/Contributions/manpages/brew.1.md
index 563d072c2..21b839917 100644
--- a/Library/Contributions/manpages/brew.1.md
+++ b/Library/Contributions/manpages/brew.1.md
@@ -160,10 +160,13 @@ Note that these flags should only appear after a command.
 
     To view formula history locally: `brew log -p <formula>`.
 
-  * `info --json=<version>` <formula>:
+  * `info --json=<version>` (--all|--installed|<formula>):
     Print a JSON representation of <formula>. Currently the only accepted value
     for <version> is `v1`.
 
+    Pass `--all` to get information on all formulae, or `--installed` to get
+    information on all installed formulae.
+
   * `install [--debug] [--env=<std|super>] [--ignore-dependencies] [--only-dependencies] [--cc=<compiler>] [--build-from-source] [--devel|--HEAD]` <formula>:
     Install <formula>.
 
diff --git a/Library/Homebrew/cmd/info.rb b/Library/Homebrew/cmd/info.rb
index 9deda9dfb..ef8e2ac52 100644
--- a/Library/Homebrew/cmd/info.rb
+++ b/Library/Homebrew/cmd/info.rb
@@ -41,8 +41,14 @@ module Homebrew extend self
   end
 
   def print_json
-    formulae = ARGV.include?("--all") ? Formula : ARGV.formulae
-    json = formulae.map {|f| f.to_hash}
+    ff = if ARGV.include? "--all"
+           Formula
+         elsif ARGV.include? "--installed"
+           Formula.installed
+         else
+           ARGV.formulae
+         end
+    json = ff.map {|f| f.to_hash}
     if json.size == 1
       puts Utils::JSON.dump(json.pop)
     else
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index d6a6f60e1..f0217bb74 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -369,6 +369,7 @@ class Formula
     include Enumerable
   end
 
+  # An array of all installed formulae
   def self.installed
     return [] unless HOMEBREW_CELLAR.directory?