Merge pull request #1972 from timotheecour/pr_brew_where_command

add `brew formula` command to show location of a formula

Library/Homebrew/dev-cmd/formula.rb

@@ -0,0 +1,13 @@
+#:  * `formula` <formula>:
+#:    Display the path where <formula> is
+
+require "formula"
+
+module Homebrew
+  module_function
+
+  def formula
+    raise FormulaUnspecifiedError if ARGV.named.empty?
+    ARGV.resolved_formulae.each { |f| puts f.path }
+  end
+end

Library/Homebrew/test/formula_cmd_test.rb

@@ -0,0 +1,8 @@
+require "testing_env"
+
+class IntegrationCommandTestFormula < IntegrationCommandTestCase
+  def test_formula
+    formula_file = setup_test_formula "testball"
+    assert_equal formula_file.to_s, cmd("formula", "testball")
+  end
+end

completions/zsh/_brew

@@ -88,6 +88,7 @@ __brew_common_commands() {
     'doctor:audits your installation for common issues'
     'edit:edit a formula'
     'fetch:download formula resources to the cache'
+    'formula:the path for a formula'
     'gist-logs:generate a gist of the full build logs'
     'home:visit the homepage of a formula or the brew project'
     'info:information about a formula'
@@ -366,6 +367,11 @@ _brew_fetch() {
     '*:formula:__brew_formulae'
 }
 
+# brew formula formula:
+_brew_formula() {
+  __brew_formulae
+}
+
 # brew gist-logs [--new-issue|-n] formula
 _brew_gist_logs() {
   _arguments \

docs/brew.1.html

@@ -540,6 +540,7 @@ you to explicitly set the name and version of the package you are creating.</p>
 the specified tap.</p></dd>
 <dt class="flush"><code>edit</code></dt><dd><p>Open all of Homebrew for editing.</p></dd>
 <dt><code>edit</code> <var>formula</var></dt><dd><p>Open <var>formula</var> in the editor.</p></dd>
+<dt><code>formula</code> <var>formula</var></dt><dd><p>Display the path where <var>formula</var> is</p></dd>
 <dt><code>linkage</code> [<code>--test</code>] [<code>--reverse</code>]  <var>formula-name</var></dt><dd><p>Checks the library links of an installed formula.</p>
 
 <p>Only works on installed formulae. An error is raised if it is run on

manpages/brew.1

@@ -731,6 +731,10 @@ Open all of Homebrew for editing\.
 Open \fIformula\fR in the editor\.
 .
 .TP
+\fBformula\fR \fIformula\fR
+Display the path where \fIformula\fR is
+.
+.TP
 \fBlinkage\fR [\fB\-\-test\fR] [\fB\-\-reverse\fR] \fIformula\-name\fR
 Checks the library links of an installed formula\.
 .