Add PLIPs script

This fixes #68

Create a script that checkouts buildout.coredev, looks for PLIPs
cfg files and update jobs.yml with them.

jobs.yml

@@ -394,7 +394,7 @@
 
     scm:
         - buildout-coredev:
-            branch: '5.0'
+            branch: '{branch}'
 
     builders:
         - shell: |

plips.py

@@ -0,0 +1,101 @@
+# -*- coding: utf-8 -*-
+"""Add all existing PLIPs to jobs.yml
+
+Scan buildout.coredev active branches for PLIPs cfg files and add them to
+the list of jobs to be created by jenkins-job-builder.
+"""
+import os
+import re
+import subprocess
+
+
+GIT_FOLDER = 'tmp'
+GIT_URL = 'https://github.com/plone/buildout.coredev.git'
+BRANCHES = (
+    '4.3',
+    '5.0',
+)
+
+
+def get_plips():
+    """Find all PLIPs cfg files on buildout.coredev branches."""
+    regex = re.compile(r'plip(\d+)-*(.+).cfg')
+    plips = []
+
+    for branch in BRANCHES:
+        p = subprocess.Popen(
+            ['git', 'checkout', branch, ],
+            cwd=GIT_FOLDER
+        )
+        p.wait()
+
+        for plip in sorted(os.listdir('{0}/plips'.format(GIT_FOLDER))):
+            data = regex.match(plip)
+            if data:
+                plip_number = data.groups()[0]
+                plip_name = data.groups()[1]
+                plips.append(
+                    {'branch': branch,
+                     'number': plip_number,
+                     'name': plip_name,
+                     'cfg': 'plips/{0}'.format(plip),
+                     }
+                )
+    return plips
+
+
+def update_jobs_yml(plips):
+    """Read jjb jobs definition and update PLIPs project."""
+    jobs_file = 'jobs.yml'
+    new_jobs_file = 'jobs-tmp.yml'
+
+    with open(jobs_file) as jobs_file_handler, \
+            open(new_jobs_file, 'w') as new_jobs_file_handler:
+
+        found = False
+        for line in jobs_file_handler.readlines():
+            # look for the marker PLIPs project and override
+            if not found and line.strip() == 'name: PLIPs':
+                found = True
+
+                new_jobs_file_handler.write(line)
+                new_jobs_file_handler.write('    plip:\n')
+                for plip in plips:
+                    write_job_definition(plip, new_jobs_file_handler)
+
+            elif not found:
+                new_jobs_file_handler.write(line)
+
+            # once all previously defined plips are processed,
+            # write the ending jobs and template and let it copy verbatim again
+            if found and line.strip() == "- 'plip-{plip}'":
+                new_jobs_file_handler.write('\n    jobs:\n')
+                new_jobs_file_handler.write(line)
+                found = False
+
+    os.rename(new_jobs_file, jobs_file)
+
+
+def write_job_definition(plip, file_handler):
+    """Write jjb definition for the given plip on the given file."""
+    job_id = '{0}-{1}-{2}'.format(
+        plip['branch'],
+        plip['number'],
+        plip['name'],
+    )
+    file_handler.write('        - {0}:\n'.format(job_id))
+    file_handler.write('            buildout: {0}\n'.format(plip['cfg']))
+    file_handler.write('            branch: {0}\n'.format(plip['branch']))
+
+
+def main():
+    # remove and download again buildout.coredev
+    subprocess.call(['rm', '-rf', GIT_FOLDER ])
+    subprocess.call(['git', 'clone', '-q', GIT_URL, GIT_FOLDER])
+
+    plips = get_plips()
+    update_jobs_yml(plips)
+
+
+if __name__ == '__main__':
+    main()