New command line structure.

requirements.txt

@@ -1 +1,2 @@
-numpy==1.11.1
+numpy>=1.11.1
+Click==6.6

seabird/cli.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+""" Command line utilities for package Seabird
+"""
+
+import click
+
+from seabird.exceptions import CNVError
+from .cnv import fCNV
+from .netcdf import cnv2nc
+
+@click.group()
+def cli():
+    """ Utilities for seabird files
+    """
+    pass
+
+@cli.command(name='cnvdump')
+@click.argument('inputfilename', type=click.Path(exists=True))
+def dump(inputfilename):
+    """ Dump the contents of a CNV file
+    """
+
+    try:
+        data = fCNV(inputfilename)
+    except CNVError as e:
+        print("\033[91m%s\033[0m" % e.msg)
+        import sys; sys.exit()
+    except:
+        raise
+
+    print("file: %s" % inputfilename)
+    print("Global attributes")
+    for a in sorted(data.attributes.keys()):
+        print("\t\033[93m%s\033[0m: %s" % (a, data.attributes[a]))
+
+    print("\nVariabes")
+    for k in data.keys():
+        print("\033[91m%s\033[0m" % k)
+        for a in data[k].attributes.keys():
+            print("\t\033[93m%s\033[0m: %s" % (a, data[k].attributes[a]))
+
+@cli.command(name='cnv2nc')
+@click.option('--outputfilename', default=None,
+        help='The output netCDF filename.')
+@click.argument('inputfilename', type=click.Path(exists=True))
+def nc(inputfilename, outputfilename):
+    """ Export a CNV file as a netCDF
+    """
+    if outputfilename is None:
+        outputfilename = inputfilename.replace('.cnv','.nc')
+        click.echo('Saving on %s' % outputfilename)
+    data = fCNV(inputfilename)
+    cnv2nc(data, outputfilename)