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Diffstat (limited to 'waflib/extras/run_py_script.py')
| -rw-r--r-- | waflib/extras/run_py_script.py | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/waflib/extras/run_py_script.py b/waflib/extras/run_py_script.py new file mode 100644 index 0000000..3670381 --- /dev/null +++ b/waflib/extras/run_py_script.py @@ -0,0 +1,104 @@ +#!/usr/bin/env python +# encoding: utf-8 +# Hans-Martin von Gaudecker, 2012 + +""" +Run a Python script in the directory specified by **ctx.bldnode**. + +Select a Python version by specifying the **version** keyword for +the task generator instance as integer 2 or 3. Default is 3. + +If the build environment has an attribute "PROJECT_PATHS" with +a key "PROJECT_ROOT", its value will be appended to the PYTHONPATH. +Same a string passed to the optional **add_to_pythonpath** +keyword (appended after the PROJECT_ROOT). + +Usage:: + + ctx(features='run_py_script', version=3, + source='some_script.py', + target=['some_table.tex', 'some_figure.eps'], + deps='some_data.csv', + add_to_pythonpath='src/some/library') +""" + +import os, re +from waflib import Task, TaskGen, Logs + + +def configure(conf): + """TODO: Might need to be updated for Windows once + "PEP 397":http://www.python.org/dev/peps/pep-0397/ is settled. + """ + conf.find_program('python', var='PY2CMD', mandatory=False) + conf.find_program('python3', var='PY3CMD', mandatory=False) + if not conf.env.PY2CMD and not conf.env.PY3CMD: + conf.fatal("No Python interpreter found!") + +class run_py_2_script(Task.Task): + """Run a Python 2 script.""" + run_str = '${PY2CMD} ${SRC[0].abspath()}' + shell=True + +class run_py_3_script(Task.Task): + """Run a Python 3 script.""" + run_str = '${PY3CMD} ${SRC[0].abspath()}' + shell=True + +@TaskGen.feature('run_py_script') +@TaskGen.before_method('process_source') +def apply_run_py_script(tg): + """Task generator for running either Python 2 or Python 3 on a single + script. + + Attributes: + + * source -- A **single** source node or string. (required) + * target -- A single target or list of targets (nodes or strings) + * deps -- A single dependency or list of dependencies (nodes or strings) + * add_to_pythonpath -- A string that will be appended to the PYTHONPATH environment variable + + If the build environment has an attribute "PROJECT_PATHS" with + a key "PROJECT_ROOT", its value will be appended to the PYTHONPATH. + """ + + # Set the Python version to use, default to 3. + v = getattr(tg, 'version', 3) + if v not in (2, 3): + raise ValueError("Specify the 'version' attribute for run_py_script task generator as integer 2 or 3.\n Got: %s" %v) + + # Convert sources and targets to nodes + src_node = tg.path.find_resource(tg.source) + tgt_nodes = [tg.path.find_or_declare(t) for t in tg.to_list(tg.target)] + + # Create the task. + tsk = tg.create_task('run_py_%d_script' %v, src=src_node, tgt=tgt_nodes) + + # custom execution environment + # TODO use a list and os.sep.join(lst) at the end instead of concatenating strings + tsk.env.env = dict(os.environ) + tsk.env.env['PYTHONPATH'] = tsk.env.env.get('PYTHONPATH', '') + project_paths = getattr(tsk.env, 'PROJECT_PATHS', None) + if project_paths and 'PROJECT_ROOT' in project_paths: + tsk.env.env['PYTHONPATH'] += os.pathsep + project_paths['PROJECT_ROOT'].abspath() + if getattr(tg, 'add_to_pythonpath', None): + tsk.env.env['PYTHONPATH'] += os.pathsep + tg.add_to_pythonpath + + # Clean up the PYTHONPATH -- replace double occurrences of path separator + tsk.env.env['PYTHONPATH'] = re.sub(os.pathsep + '+', os.pathsep, tsk.env.env['PYTHONPATH']) + + # Clean up the PYTHONPATH -- doesn't like starting with path separator + if tsk.env.env['PYTHONPATH'].startswith(os.pathsep): + tsk.env.env['PYTHONPATH'] = tsk.env.env['PYTHONPATH'][1:] + + # dependencies (if the attribute 'deps' changes, trigger a recompilation) + for x in tg.to_list(getattr(tg, 'deps', [])): + node = tg.path.find_resource(x) + if not node: + tg.bld.fatal('Could not find dependency %r for running %r' % (x, src_node.abspath())) + tsk.dep_nodes.append(node) + Logs.debug('deps: found dependencies %r for running %r', tsk.dep_nodes, src_node.abspath()) + + # Bypass the execution of process_source by setting the source to an empty list + tg.source = [] + |