pymk is a script that provides the sam functionality that "makefile" does, but the "makefile" (mkfile.py) is a python script. Code of mkfile.py is clean, and it can do more things (like check all files from all folders and subfolders named "migrations").
Setting dependency in makefile is not flexible. Supports only "if file is newear, then rebuild". Pymk can have in it's dependency whatever python code you want. Event if you want to check something using network.
Full documentation can be found here: http://pythonhosted.org/Pymk/
First, we need to make an empty "mkfile.py". Pymk will try to search for a list of taks and will find nothing.
$ touch mkfile.py $ pymk Avalible tasks:
Now we need to make simple task. Put this in mkfile.py
from pymk.task import Task class task(Task): dependencys = [] def build(cls): print 'Hello'
And now we can execute
$ pymk Avalible tasks: task $ pymk task * Building 'task' Hello
If you want pymk to run some task by default, just put this line at the end of the mkfile.py
SETTINGS = { 'default task' : task, }
And run
$ pymk * Building 'task' Hello
Ok, but now our task are build every time we make it. We need to make a file in our script, and point which file we are creating. Out mkfile.py should look like this
from pymk.task import Task from pymk.extra import touch class task(Task): dependencys = [] output_file = 'a.out' def build(cls): touch(cls.output_file) SETTINGS = { 'default task' : task, }
And then we execute
$ pymk * Building 'task' $ pymk * 'task' is up to date $ ls a.out a.out
And now we start playing. We need some dependency. Here's the file
from pymk.task import Task from pymk.dependency import FileChanged class task(Task): output_file = 'a.out' dependencys = [ FileChanged('b.out'), ] def build(cls): fp = open(cls.output_file, 'a') fp.write('bulded!\n') fp.close() SETTINGS = { 'default task' : task, }
We can now try:
$ pymk Could not create file b.out $ ls mkfile.py mkfile.pyc
But this will not work becouse of absance of b.out file. So we will create it and try again.
$ touch b.out $ pymk * Building 'task' $ ls a.out b.out mkfile.py mkfile.pyc $ pymk * 'task' is up to date $ touch b.out $ pymk * Building 'task'
As we can see, a.out will be created when b.out will be changed. This dependency is implemented for files that can changed by external programs (or programmers). If we need a task depedency, like "if task changed, rebuild me" we can make something like that
from pymk.task import Task class secon_task(Task): output_file = 'b.out' dependencys = [] def build(cls): fp = open(cls.output_file, 'a') fp.write('bulded!\n') fp.close() class task(Task): output_file = 'a.out' dependencys = [ secon_task.dependency_FileChanged(), ] def build(cls): fp = open(cls.output_file, 'a') fp.write('bulded!\n') fp.close() SETTINGS = { 'default task' : task, }
And new can run this:
$ rm *.out # if something was left before $ pymk * Building 'secon_task' * Building 'task' $ pymk * 'task' is up to date $ touch b.out $ pymk * Building 'task'