1 files changed, 86 insertions, 0 deletions
diff --git a/extras/run_r_script.py b/extras/run_r_script.py
new file mode 100644
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+++ b/extras/run_r_script.py
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+#!/usr/bin/env python
+# encoding: utf-8
+# Hans-Martin von Gaudecker, 2012
+
+"""
+Run a R script in the directory specified by **ctx.bldnode**.
+
+For error-catching purposes, keep an own log-file that is destroyed if the
+task finished without error. If not, it will show up as rscript_[index].log
+in the bldnode directory.
+
+Usage::
+
+    ctx(features='run_r_script',
+        source='some_script.r',
+        target=['some_table.tex', 'some_figure.eps'],
+        deps='some_data.csv')
+"""
+
+
+import os, sys
+from waflib import Task, TaskGen, Logs
+
+R_COMMANDS = ['RTerm', 'R', 'r']
+
+def configure(ctx):
+	ctx.find_program(R_COMMANDS, var='RCMD', errmsg = """\n
+No R executable found!\n\n
+If R is needed:\n
+	1) Check the settings of your system path.
+	2) Note we are looking for R executables called: %s
+	   If yours has a different name, please report to hmgaudecker [at] gmail\n
+Else:\n
+	Do not load the 'run_r_script' tool in the main wscript.\n\n"""  % R_COMMANDS)
+	ctx.env.RFLAGS = 'CMD BATCH --slave'
+
+class run_r_script_base(Task.Task):
+	"""Run a R script."""
+	run_str = '"${RCMD}" ${RFLAGS} "${SRC[0].abspath()}" "${LOGFILEPATH}"'
+	shell = True
+
+class run_r_script(run_r_script_base):
+	"""Erase the R overall log file if everything went okay, else raise an
+	error and print its 10 last lines.
+	"""
+	def run(self):
+		ret = run_r_script_base.run(self)
+		logfile = self.env.LOGFILEPATH
+		if ret:
+			mode = 'r'
+			if sys.version_info.major >= 3:
+				mode = 'rb'
+			with open(logfile, mode=mode) as f:
+				tail = f.readlines()[-10:]
+			Logs.error("""Running R on %r returned the error %r\n\nCheck the log file %s, last 10 lines\n\n%s\n\n\n""",
+				self.inputs[0], ret, logfile, '\n'.join(tail))
+		else:
+			os.remove(logfile)
+		return ret
+
+
+@TaskGen.feature('run_r_script')
+@TaskGen.before_method('process_source')
+def apply_run_r_script(tg):
+	"""Task generator customising the options etc. to call R in batch
+	mode for running a R script.
+	"""
+
+	# 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)]
+
+	tsk = tg.create_task('run_r_script', src=src_node, tgt=tgt_nodes)
+	tsk.env.LOGFILEPATH = os.path.join(tg.bld.bldnode.abspath(), '%s_%d.log' % (os.path.splitext(src_node.name)[0], tg.idx))
+
+	# 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 = []
+