From 9ef617317c1b51209aa41b523c122b61c9b23aaf Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Thu, 11 Apr 2013 20:40:32 +0100
Subject: Simple implementation

---
 desktop-cronish | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/desktop-cronish b/desktop-cronish
index a67af1e..f69d16e 100755
--- a/desktop-cronish
+++ b/desktop-cronish
@@ -16,6 +16,8 @@
 
 
 import cliapp
+import time
+import yaml
 
 
 __version__ = '0.0'
@@ -31,7 +33,48 @@ class DesktopCronish(cliapp.Application):
             default=0)
     
     def process_args(self, args):
-        pass
+        self.jobs = {}
+        self.previously = {}
+        self.process_inputs(args)
+        self.execute_jobs()
+    
+    def process_input(self, filename):
+        with self.open_input(filename, 'r') as f:
+            job_dict = yaml.safe_load(f)
+        self.jobs.update(job_dict)
+
+    def execute_jobs(self):
+        n = 0
+        max_jobs = self.settings['max-jobs']
+        while max_jobs == 0 or n < max_jobs:
+            job_name, when = self.choose_job()
+            self.wait_until(when)
+            self.execute_job(job_name)
+            n += 1
+    
+    def choose_job(self):
+        next_job_name = None
+        next_when = 0
+        for job_name, job in self.jobs.items():
+            job_when = self.previously.get(job_name, 0) + job['interval']
+            if next_job_name is None or job_when <= next_when:
+                next_job_name = job_name
+                next_when = job_when
+        return next_job_name, next_when
+    
+    def wait_until(self, when):
+        while self.now() < when:
+            time.sleep(when - self.now())
+    
+    def execute_job(self, job_name):
+        job = self.jobs[job_name]
+        exit, out, err = cliapp.runcmd_unchecked(['sh', '-c', job['command']])
+        self.output.write(out)
+        if exit != 0:
+            sys.stderr.write(err)
+        self.previously[job_name] = self.now()
 
+    def now(self):
+        return time.time()
 
 DesktopCronish(version=__version__).run()
-- 
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