First attempt at fixing latex scientific notation

Ref: #31

src/xoctave/display.cpp

@@ -25,9 +25,10 @@
 #include <octave/symtab.h>
 
 #include <nlohmann/json.hpp>
+#include <regex>
 
-#include "xoctave_interpreter.hpp"
 #include "xeus/xinterpreter.hpp"
+#include "xoctave_interpreter.hpp"
 
 namespace xoctave::display {
 
@@ -113,6 +114,22 @@ octave_value_list matrix_to_html(const octave_value_list& args, int /*nargout*/)
 	return ovl(t.str());
 }
 
+std::string latex_fix_sci_not(std::string text) {
+	text = std::regex_replace(text, std::regex("e\\+[0]*([0-9]+)"), "\\mathrm{ᴇ}{$1}");
+	text = std::regex_replace(text, std::regex("e\\-[0]*([0-9]+)"), "\\mathrm{ᴇ\\text{-}}{$1}");
+
+	return text;
+}
+
+octave_value_list latex_fix_sci_not(const octave_value_list& args, int /*nargout*/) {
+	if (args.length() != 1)
+		print_usage();
+
+	std::string text = args(0).xstring_value("IN must be a string");
+
+	return ovl(latex_fix_sci_not(text));
+}
+
 octave_value_list matrix_to_latex(const octave_value_list& args, int /*nargout*/) {
 	std::ostringstream l;
 
@@ -148,23 +165,25 @@ octave_value_list matrix_to_latex(const octave_value_list& args, int /*nargout*/
 
 	l << "$$";
 
-	return ovl(l.str());
+	return ovl(latex_fix_sci_not(l.str()));
 }
 
 }  // namespace
 
 void register_all(octave::interpreter& i) {
-	auto &s = i.get_symbol_table();
+	auto& s = i.get_symbol_table();
 
 	auto display_data_func = new octave_builtin(display_data, "display_data", __FILE__, "");
 	auto override_path_func = new octave_builtin(override_path, "XOCTAVE_OVERRIDE_PATH", __FILE__, "");
 	auto matrix_to_html_func = new octave_builtin(matrix_to_html, "__matrix_to_html__", __FILE__, "");
 	auto matrix_to_latex_func = new octave_builtin(matrix_to_latex, "__matrix_to_latex__", __FILE__, "");
+	auto latex_fix_sci_not_func = new octave_builtin(latex_fix_sci_not, "__latex_fix_sci_not__", __FILE__, "");
 
 	s.install_built_in_function("display_data", display_data_func);
 	s.install_built_in_function("XOCTAVE_OVERRIDE_PATH", override_path_func);
 	s.install_built_in_function("__matrix_to_html__", matrix_to_html_func);
 	s.install_built_in_function("__matrix_to_latex__", matrix_to_latex_func);
+	s.install_built_in_function("__latex_fix_sci_not__", latex_fix_sci_not_func);
 }
 
 }  // namespace xoctave::display