Dependencies not executed for tasks selected on the command line

[henrus]

Hi,

thanks for this great tool.

import json

def task_read():
   def read():
       with open('data.txt') as json_file:
           data = json.load(json_file)
           return data
   return {
       'file_dep': ['data.txt'],
       'actions': [(read,)],
        'verbosity': 2,
   }

def show_getargs(x, y):
   print("this is x: {}".format(x))
   print("this is y: {}".format(y))

def task_use_python():
  return {
      'actions': [show_getargs],
      'getargs': {'x': ('read', 'x'),
                  'y': ('read', 'y')},
      'verbosity': 2,
  }

user@machine-> cat data.txt
{
"a": 1,
"x": 2,
"y": 3,
"z": 4
}
user@machine-> doit
.  read
.  use_python
this is x: 2
this is y: 3

--> This is OK.

user@machine-> sed -i 's/2/12/g' data.txt
user@machine-> doit
.  read
.  use_python
this is x: 12
this is y: 3

--> This is OK.

user@machine-> sed -i 's/3/13/g' data.txt
user@machine-> doit use_python
-- use_python

IMHO this is not OK since the read task should be fired up. I expected the following output

user@machine-> doit use_python
.  read
.  use_python
this is x: 12
this is y: 13

Best Regards,

Henrik

Environment

1. OS: Ubuntu 16.04
2. python version: 3.6
3. doit version: 0.32

[schettino72]

This is the expected behaviour. Docs says "getargs" creates an implicit "setup_task".

But your expectation is also valid. I actually decided that it implicitly creates a "setup_task" because it is easy to explicitly add "task_dep" to achieve what you want.
But if the implicit creation was "task_dep" it would not be possible for it to behave like a "setup_task".

I will tag this issue as "doc", so we can make the documentation clear.

TLDR:

Add the following to use_python:

 "task_dep": ["read"],