Merge pull request #8 from j8r/each_use

Add an `each_use` loop

README.md

@@ -28,6 +28,10 @@ Returns a NamedTuple including the used, idle and total CPU time.
 
 Returns the cpu used in percentage in the last `sleep_time` seconds.
 
+`.each_use(sleep_time = 1) : Int32`
+
+Returns the cpu used in percentage each `sleep_time` seconds infinitely.
+
 #### Methods included in the `Hardware::Memory` struct:
 
 `.new`
@@ -64,7 +68,9 @@ memory.used        #=> 2731404
 memory.percent     #=> 32
 
 Hardware::CPU.used #=> 12
-
+Hardware::CPU.each_use do |cpu|
+  cpu              #=> 17
+end
 ```
 
 ## Development

spec/cpu_spec.cr

@@ -8,4 +8,11 @@ describe Hardware::CPU do
   it "checks the percentage used" do
     (0 <= Hardware::CPU.used <= 100).should be_true
   end
+
+  it "checks the percentage in each_use" do
+    Hardware::CPU.each_use do |cpu|
+      (0 <= cpu <= 100).should be_true
+      break
+    end
+  end
 end

src/hardware.cr

@@ -1,5 +1,5 @@
-require "./hardware/*"
+require "./hardware/**"
 
 module Hardware
-  VERSION = "0.2.1"
+  VERSION = "0.2.2"
 end

src/hardware/cpu.cr

@@ -9,12 +9,19 @@ module Hardware::CPU
     }
   end
 
-  def self.used(sleep_time = 1)
-    proc0 = info
-    sleep sleep_time
-    proc1 = info
+  def self.each_use(sleep_time = 1)
+    proc_last = info
+    loop do
+      sleep sleep_time
+      proc_now = info
+
+      # 100 * Usage / Total
+      yield (100 * ((proc_now[:used] - proc_last[:used]).to_f32 / (proc_now[:total] - proc_last[:total]))).round
+      proc_last = proc_now
+    end
+  end
 
-    # 100 * Usage / Total
-    (100 * ((proc1[:used] - proc0[:used]).to_f32 / (proc1[:total] - proc0[:total]))).round
+  def self.used(sleep_time = 1)
+    each_use(sleep_time) { |cpu| return cpu }
   end
 end