Include build step for a file containing just the sage in main.tex

.gitignore

 main.*
 !main.tex
+filtered_sage.txt

Makefile

@@ -14,6 +14,9 @@ main.sagetex.sout: ${SAGETEXSCRIPT} ${PYPLOTFILES}
 ${SAGETEXSCRIPT}: ${TEXFILES}
 	latexmk -interaction=nonstopmode ${MAINTEXFILE} || echo this shoud fail
 
+filtered_sage.txt: ${MAINTEXFILE} filter_sage.sed
+	./filter_sage.sed ${MAINTEXFILE} > $@
+
 .PHONY: clean
 clean:
 	rm -rf **/__pycache__

filter_sage.sed

+#!/usr/bin/sed -f
+
+0,/^\\begin{sagesilent}/d
+/^\\end{sagesilent}/,/^\\begin{sagesilent}/{
+	s;.*\\sage{\(.*\)}.*;\n# RENDERED TO LATEX: \1\n;p
+	d
+}