added grep command

--HG--
branch : pmacs2

method.py

@@ -1398,3 +1398,30 @@ class RegisterRestore(Method):
         if len(name) > self.MAX_REG:
             name = name[0:self.MAX_REG] + '...'
         w.set_error('Restored %r from register %r' % (text2, name2))
+
+class Grep(Method):
+    '''help here'''
+    args = [Argument('pattern', datatype="str", prompt="Pattern: ")]
+    def _execute(self, w, **vargs):
+        cmd = ("/usr/bin/grep", '-E', '-n', vargs['pattern'], '-')
+        pipe = popen2.Popen3(cmd, capturestderr=True)
+        pid = pipe.pid
+
+        indata = w.buffer.make_string()
+        pipe.tochild.write(indata)
+        pipe.tochild.close()
+
+        outdata = pipe.fromchild.read()
+        errdata = pipe.childerr.read()
+        status = pipe.wait() >> 8
+
+        if status == 0:
+            num = len(outdata.split('\n'))
+            w.application.data_buffer("*Grep*", outdata, switch_to=True)
+            w.application.set_error("Grep: %d matches found" % num)
+        elif status == 1:
+            w.application.set_error("Grep: no matches found")
+        else:
+            w.application.data_buffer("*Grep*", outdata, switch_to=True)
+            w.set_error("Grep: error (exited with status %d)" % status)
+