add driver and ins file generics

PyTeX/format/constants.py

@@ -33,3 +33,36 @@ YAML_TEXT = 'text'
 YAML_REPO = 'repo'
 YAML_PYTEX = 'pytex'
 YAML_DOCSTRIP = 'docstrip'
+
+
+INS_FILE = [
+    r'\begingroup',
+    r'\input docstrip.tex',
+    r'\keepsilent',
+    r'\usedir{{{directory}}}',
+    r'\preamble',
+    r'___________________________________________________________',
+    r'{preamble}',
+    r'',
+    r'\endpreamble',
+    r'\postamble',
+    r'',
+    r'{postamble}',
+    r'',
+    r'\endpostamble',
+    r'\askforoverwritefalse',
+    r''','''
+    r'\generate{{\file{{{{outfile}}}{{\from{{{infile}}}{{{guards}}}}}}}',
+    r''','''
+    r'\def\tmpa{{plain}}',
+    r'\ifx\tmpa\fmtname\endgroup\expandafter\bye\fi',
+    r'\endgroup',
+]
+
+DRV_FILE = [
+    r'\documentclass{{{documentclass}}}',
+    r'{{{preamble}}}',
+    r'\begin{{document}}',
+    r'\DocInput{{{infile}}}',
+    r'\end{{document}}'
+]