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105 lines
3.8 KiB
Python
105 lines
3.8 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Hans-Martin von Gaudecker, 2012
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"""
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Run a Python script in the directory specified by **ctx.bldnode**.
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Select a Python version by specifying the **version** keyword for
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the task generator instance as integer 2 or 3. Default is 3.
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If the build environment has an attribute "PROJECT_PATHS" with
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a key "PROJECT_ROOT", its value will be appended to the PYTHONPATH.
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Same a string passed to the optional **add_to_pythonpath**
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keyword (appended after the PROJECT_ROOT).
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Usage::
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ctx(features='run_py_script', version=3,
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source='some_script.py',
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target=['some_table.tex', 'some_figure.eps'],
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deps='some_data.csv',
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add_to_pythonpath='src/some/library')
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"""
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import os, re
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from waflib import Task, TaskGen, Logs
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def configure(conf):
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"""TODO: Might need to be updated for Windows once
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"PEP 397":http://www.python.org/dev/peps/pep-0397/ is settled.
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"""
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conf.find_program('python', var='PY2CMD', mandatory=False)
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conf.find_program('python3', var='PY3CMD', mandatory=False)
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if not conf.env.PY2CMD and not conf.env.PY3CMD:
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conf.fatal("No Python interpreter found!")
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class run_py_2_script(Task.Task):
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"""Run a Python 2 script."""
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run_str = '${PY2CMD} ${SRC[0].abspath()}'
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shell=True
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class run_py_3_script(Task.Task):
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"""Run a Python 3 script."""
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run_str = '${PY3CMD} ${SRC[0].abspath()}'
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shell=True
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@TaskGen.feature('run_py_script')
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@TaskGen.before_method('process_source')
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def apply_run_py_script(tg):
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"""Task generator for running either Python 2 or Python 3 on a single
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script.
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Attributes:
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* source -- A **single** source node or string. (required)
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* target -- A single target or list of targets (nodes or strings)
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* deps -- A single dependency or list of dependencies (nodes or strings)
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* add_to_pythonpath -- A string that will be appended to the PYTHONPATH environment variable
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If the build environment has an attribute "PROJECT_PATHS" with
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a key "PROJECT_ROOT", its value will be appended to the PYTHONPATH.
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"""
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# Set the Python version to use, default to 3.
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v = getattr(tg, 'version', 3)
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if v not in (2, 3):
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raise ValueError("Specify the 'version' attribute for run_py_script task generator as integer 2 or 3.\n Got: %s" %v)
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# Convert sources and targets to nodes
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src_node = tg.path.find_resource(tg.source)
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tgt_nodes = [tg.path.find_or_declare(t) for t in tg.to_list(tg.target)]
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# Create the task.
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tsk = tg.create_task('run_py_%d_script' %v, src=src_node, tgt=tgt_nodes)
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# custom execution environment
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# TODO use a list and os.sep.join(lst) at the end instead of concatenating strings
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tsk.env.env = dict(os.environ)
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tsk.env.env['PYTHONPATH'] = tsk.env.env.get('PYTHONPATH', '')
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project_paths = getattr(tsk.env, 'PROJECT_PATHS', None)
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if project_paths and 'PROJECT_ROOT' in project_paths:
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tsk.env.env['PYTHONPATH'] += os.pathsep + project_paths['PROJECT_ROOT'].abspath()
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if getattr(tg, 'add_to_pythonpath', None):
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tsk.env.env['PYTHONPATH'] += os.pathsep + tg.add_to_pythonpath
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# Clean up the PYTHONPATH -- replace double occurrences of path separator
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tsk.env.env['PYTHONPATH'] = re.sub(os.pathsep + '+', os.pathsep, tsk.env.env['PYTHONPATH'])
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# Clean up the PYTHONPATH -- doesn't like starting with path separator
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if tsk.env.env['PYTHONPATH'].startswith(os.pathsep):
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tsk.env.env['PYTHONPATH'] = tsk.env.env['PYTHONPATH'][1:]
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# dependencies (if the attribute 'deps' changes, trigger a recompilation)
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for x in tg.to_list(getattr(tg, 'deps', [])):
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node = tg.path.find_resource(x)
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if not node:
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tg.bld.fatal('Could not find dependency %r for running %r' % (x, src_node.abspath()))
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tsk.dep_nodes.append(node)
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Logs.debug('deps: found dependencies %r for running %r', tsk.dep_nodes, src_node.abspath())
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# Bypass the execution of process_source by setting the source to an empty list
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tg.source = []
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