implement first version of dtx formatter

PyTeX/format/dtx_formatter.py

@@ -1,3 +1,6 @@
+from .constants import INS_FILE, DRV_FILE
+from .enums import TeXFlavour, FormatterProperty, TeXType, FormatterMode
+from .generic_text import GenericText
 from .tex_formatter import TexFormatter
 from typing import List, Tuple
 from pathlib import Path
@@ -14,10 +17,64 @@ class DTXFormatter(TexFormatter):
 
     @property
     def output_files(self) -> List[str]:
-        return []  # TODO
+        files = [self.name + '.dtx']
+        if self.config.include_drv:
+            files.append(self.name + '.drv')
+        if self.config.include_ins:
+            files.append(self.name + '.ins')
+        return files
 
-    def open_output_stream(self, build_dir: Path) -> None:
-        pass
+    def _get_internal_file(self) -> str:
+        g = GenericText(INS_FILE)
+        switcher = {
+            TeXType.TeXPackage: '.sty',
+            TeXType.TeXClass: '.cls'
+        }
+        return g.format(
+            infile=self.name + '.dtx',
+            outfile=self.name + switcher[self.config.tex_out_type],
+            preamble='',  # TODO
+            postamble='',  # TODO
+            guards=', '.join(self.config.docstrip_guards)
+        )
 
-    def close_output_stream(self) -> None:
-        pass
+    def _get_drv_file(self) -> str:
+        g = GenericText(DRV_FILE)
+        return g.format(
+            documentclass='l3doc',  # TODO
+            preamble='',  # TODO
+            infile=self.name + '.dtx',
+        )
+
+    def format_pre_header(self) -> None:
+        self._shipout_line(r'% \iffalse meta-comment')
+
+    def format_post_header(self) -> None:
+        self._shipout_line('%</internal>')
+        self._shipout_line(
+            self._get_internal_file()
+        )
+        self._shipout_line('%')
+        self._shipout_line(
+            '%<{outtype}>{provides}'.format(
+                outtype=self.config.tex_out_type.value,
+                provides=self._get_provides_text()
+            )
+        )
+        self._shipout_line('%')
+        self._shipout_line('%<*driver>')
+        self._shipout_line(
+            self._get_drv_file()
+        )
+        self._shipout_line('%</driver>')
+        self._shipout_line(r'% \fi')
+        self._shipout_line('%')
+
+    def _post_process_line(self, line: str) -> str:
+        line = line.rstrip(' %\n')
+        if self.mode == FormatterMode.meta:
+            line = '% ' + line
+        if self.mode == FormatterMode.macrocode:
+            if self.config.tex_flavour == TeXFlavour.LaTeX2e:
+                line = line.rstrip(' %\n') + '%'
+        return line