crontab bugfix: inserting header row was clobbering the first data row

changelog.txt

@@ -8,6 +8,7 @@ jc changelog
 - Add crontab file parser with user support
 - Add __version__ variable to parser modules
 - Updated history parser to output "line" as an integer
+- Bugfix in crontab file parser: header insertion was clobbering first row
 - Just-in-time loading of parser modules instead of loading all at start
 
 20191217 v1.6.1

jc/parsers/crontab.py

@@ -132,7 +132,7 @@ import jc.parsers.universal
 
 
 class info():
-    version = '1.0'
+    version = '1.1'
     description = 'crontab file parser'
     author = 'Kelly Brazil'
     author_email = 'kellyjonbrazil@gmail.com'
@@ -252,7 +252,7 @@ def parse(data, raw=False, quiet=False):
                                   'command': cmd})
 
     # Add header row for parsing
-    cleandata[0] = 'minute hour day_of_month month day_of_week command'
+    cleandata[:0] = ['minute hour day_of_month month day_of_week command']
 
     if len(cleandata) > 1:
         cron_list = jc.parsers.universal.simple_table_parse(cleandata)

jc/parsers/crontab_u.py

@@ -254,7 +254,7 @@ def parse(data, raw=False, quiet=False):
                                   'command': cmd})
 
     # Add header row for parsing
-    cleandata[0] = 'minute hour day_of_month month day_of_week user command'
+    cleandata[:0] = ['minute hour day_of_month month day_of_week user command']
 
     if len(cleandata) > 1:
         cron_list = jc.parsers.universal.simple_table_parse(cleandata)

tests/fixtures/centos-7.7/crontab2.out

@@ -0,0 +1,5 @@
+# Run the hourly jobs
+SHELL=/bin/bash
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+MAILTO=root
+01 * * * * root run-parts /etc/cron.hourly