search: Raise exception when no formulae/casks are found; Add --pull-request switch

Library/Homebrew/cmd/search.rb

@@ -46,6 +46,8 @@ module Homebrew
       switch "--desc",
              description: "Search for formulae with a description matching <text> and casks with "\
                           "a name matching <text>."
+      switch "--pull-request",
+             description: "Search for GitHub pull requests for <text>."
 
       package_manager_switches = PACKAGE_MANAGERS.keys.map { |name| "--#{name}" }
       package_manager_switches.each do |s|
@@ -53,6 +55,7 @@ module Homebrew
                description: "Search for <text> in the given package manager's list."
       end
 
+      conflicts("--desc", "--pull-request")
       conflicts(*package_manager_switches)
     end
   end
@@ -83,6 +86,8 @@ module Homebrew
 
     if args.desc?
       search_descriptions(string_or_regex)
+    elsif args.pull_request?
+      GitHub.print_pull_requests_matching(query)
     else
       remote_results = search_taps(query, silent: true)
 
@@ -109,20 +114,16 @@ module Homebrew
       end
 
       count = all_formulae.count + all_casks.count
-      if $stdout.tty?
-        if (reason = MissingFormula.reason(query, silent: true)) && !local_casks.include?(query)
-          if count.positive?
-            puts
-            puts "If you meant #{query.inspect} specifically:"
-          end
-          puts reason
-        elsif count.zero?
-          puts "No formula or cask found for #{query.inspect}."
-          GitHub.print_pull_requests_matching(query)
+
+      if $stdout.tty? && (reason = MissingFormula.reason(query, silent: true)) && !local_casks.include?(query)
+        if count.positive?
+          puts
+          puts "If you meant #{query.inspect} specifically:"
         end
-      elsif count.zero?
-        $stderr.puts "No formula or cask found for #{query.inspect}."
+        puts reason
       end
+
+      raise "No formulae or casks found for #{query.inspect}." if count.zero?
     end
 
     return unless $stdout.tty?

Library/Homebrew/utils/github.rb

@@ -352,16 +352,24 @@ module GitHub
   def print_pull_requests_matching(query)
     open_or_closed_prs = search_issues(query, type: "pr", user: "Homebrew")
 
-    open_prs = open_or_closed_prs.select { |i| i["state"] == "open" }
-    prs = if !open_prs.empty?
-      puts "Open pull requests:"
-      open_prs
-    else
-      puts "Closed pull requests:" unless open_or_closed_prs.empty?
-      open_or_closed_prs.take(20)
+    open_prs, closed_prs = open_or_closed_prs.partition { |pr| pr["state"] == "open" }
+                                             .map { |prs| prs.map { |pr| "#{pr["title"]} (#{pr["html_url"]})" } }
+
+    if open_prs.present?
+      ohai "Open pull requests"
+      open_prs.each { |pr| puts pr }
     end
 
-    prs.each { |i| puts "#{i["title"]} (#{i["html_url"]})" }
+    if closed_prs.present?
+      puts if open_prs.present?
+
+      ohai "Closed pull requests"
+      closed_prs.take(20).each { |pr| puts pr }
+
+      puts "..." if closed_prs.count > 20
+    end
+
+    puts "No pull requests found for #{query.inspect}" if open_prs.blank? && closed_prs.blank?
   end
 
   def create_fork(repo)

docs/Manpage.md

@@ -515,6 +515,8 @@ No online search is performed.
   Without *`text`*, list all locally available casks (including tapped ones, no online search is performed). With *`text`*, search online and locally for casks.
 * `--desc`:
   Search for formulae with a description matching *`text`* and casks with a name matching *`text`*.
+* `--pull-request`:
+  Search for GitHub pull requests for *`text`*.
 * `--macports`:
   Search for *`text`* in the given package manager's list.
 * `--fink`:

manpages/brew.1

@@ -740,6 +740,10 @@ Without \fItext\fR, list all locally available casks (including tapped ones, no
 Search for formulae with a description matching \fItext\fR and casks with a name matching \fItext\fR\.
 .
 .TP
+\fB\-\-pull\-request\fR
+Search for GitHub pull requests for \fItext\fR\.
+.
+.TP
 \fB\-\-macports\fR
 Search for \fItext\fR in the given package manager\'s list\.
 .