+ string command = "echo '" + data + "' | " + cmd;
+ lyxerr << "calling: " << command << endl;
+ cmd_ret const ret = RunCommand(command);
+ return ret.second;
+ }
+
+ string::size_type get_matching_brace(string const & str, string::size_type i)
+ {
+ int count = 1;
+ string::size_type n = str.size();
+ while (i < n) {
+ i = str.find_first_of("{}", i+1);
+ if (i == string::npos) return i;
+ if (str[i] == '{')
+ ++count;
+ else
+ --count;
+ if (count == 0)
+ return i;
+ }
+ return string::npos;
+ }
+
+ string::size_type get_matching_brace_back(string const & str, string::size_type i)
+ {
+ int count = 1;
+ while (i > 0) {
+ i = str.find_last_of("{}", i-1);
+ if (i == string::npos) return i;
+ if (str[i] == '}')
+ ++count;
+ else
+ --count;
+ if (count == 0)
+ return i;
+ }
+ return string::npos;
+ }
+
+ MathArray pipeThroughMaxima(string const &, MathArray const & ar)
+ {
+ ostringstream os;
+ MaximaStream ms(os);
+ ms << ar;
+ string expr = os.str();
+ string const header = "SIMPSUM:true;";
+
+ string out;
+ for (int i = 0; i < 100; ++i) { // at most 100 attempts
+ // try to fix missing '*' the hard way
+ //
+ // > echo "2x;" | maxima
+ // ...
+ // (C1) Incorrect syntax: x is not an infix operator
+ // 2x;
+ // ^
+ //
+ lyxerr << "checking expr: '" << expr << "'" << endl;
+ string full = header + "tex(" + expr + ");";
+ out = captureOutput("maxima", full);
+
+ // leave loop if expression syntax is probably ok
+ if (out.find("Incorrect syntax") == string::npos)
+ break;
+
+ // search line with "Incorrect syntax"
+ istringstream is(out.c_str());
+ string line;
+ while (is) {
+ getline(is, line);
+ if (line.find("Incorrect syntax") != string::npos)
+ break;
+ }
+
+ // 2nd next line is the one with caret
+ getline(is, line);
+ getline(is, line);
+ string::size_type pos = line.find('^');
+ lyxerr << "found caret at pos: '" << pos << "'" << endl;
+ if (pos == string::npos || pos < 4)
+ break; // caret position not found
+ pos -= 4; // skip the "tex(" part
+ if (expr[pos] == '*')
+ break; // two '*' in a row are definitely bad
+ expr.insert(pos, "*");
+ }
+
+ vector<string> tmp = getVectorFromString(out, "$$");
+ if (tmp.size() < 2)
+ return MathArray();
+
+ out = subst(tmp[1],"\\>", "");
+ lyxerr << "out: '" << out << "'" << endl;
+
+ // Ugly code that tries to make the result prettier
+
+ string::size_type i = out.find("\\mathchoice");
+ while (i != string::npos) {
+ string::size_type j = get_matching_brace(out, i + 12);
+ string::size_type k = get_matching_brace(out, j + 1);
+ k = get_matching_brace(out, k + 1);
+ k = get_matching_brace(out, k + 1);
+ string mid = out.substr(i + 13,j - i - 13);
+ if (mid.find("\\over") != string::npos)
+ mid = '{' + mid + '}';
+ out = out.substr(0,i)
+ + mid
+ + out.substr(k + 1);
+ //lyxerr << "out: " << out << endl;
+ i = out.find("\\mathchoice", i);
+ break;
+ }
+
+ i = out.find("\\over");
+ while (i != string::npos) {
+ string::size_type j = get_matching_brace_back(out, i - 1);
+ if (j == string::npos || j == 0) break;
+ string::size_type k = get_matching_brace(out, i + 5);
+ if (k == string::npos || k + 1 == out.size()) break;
+ out = out.substr(0,j - 1)
+ + "\\frac"
+ + out.substr(j,i - j)
+ + out.substr(i + 5,k - i - 4)
+ + out.substr(k + 2);
+ //lyxerr << "out: " << out << endl;
+ i = out.find("\\over", i + 4);
+ }
+ MathArray res;
+ mathed_parse_cell(res, out);
+ return res;