Read output from git patch

lib/format-staged/io.rb

@@ -2,22 +2,11 @@
 
 require 'English'
 class FormatStaged
-  def get_output(*args, lines: true)
+  def get_output(*args, lines: true, silent: false)
     puts "> #{args.join(' ')}" if @verbose
 
-    output = IO.popen(args, err: :err) do |io|
-      if lines
-        io.readlines.map(&:chomp)
-      else
-        io.read
-      end
-    end
-
-    if @verbose && lines
-      output.each do |line|
-        puts "< #{line}"
-      end
-    end
+    r = IO.popen(args, err: :err)
+    output = read_output(r, lines: lines, silent: silent)
 
     raise 'Failed to run command' unless $CHILD_STATUS.success?
 
@@ -40,4 +29,17 @@ class FormatStaged
 
     [pid, r]
   end
+
+  def read_output(r, lines: true, silent: false)
+    result = r.read
+    splits = result.split("\n")
+    if @verbose && !silent
+      splits.each do |line|
+        puts "< #{line}"
+      end
+    end
+    r.close
+
+    lines ? splits : result
+  end
 end

lib/format_staged.rb

@@ -67,12 +67,7 @@ class FormatStaged
     pid2, r = pipe_command format_command, source: r
     pid3, r = pipe_command 'git', 'hash-object', '-w', '--stdin', source: r
 
-    result = r.readlines.map(&:chomp)
-    if @verbose
-      result.each do |line|
-        puts "< #{line}"
-      end
-    end
+    result = read_output(r, lines: false).chomp
 
     Process.wait pid1
     raise "Cannot read #{file.dst_hash} from object database" unless $CHILD_STATUS.success?
@@ -83,7 +78,7 @@ class FormatStaged
     Process.wait pid3
     raise 'Error writing formatted file back to object database' unless $CHILD_STATUS.success? && !result.empty?
 
-    result.first
+    result
   end
 
   def object_is_empty(hash)
@@ -102,6 +97,8 @@ class FormatStaged
     patch_out.write patch
     patch_out.close
 
+    read_output r
+
     Process.wait pid
     raise 'Error applying patch' unless $CHILD_STATUS.success?
   end