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//: Dead simple persistence.
//: 'restore' - reads string from a file
//: 'save' - writes string to a file
:(before "End Primitive Recipe Declarations")
RESTORE,
:(before "End Primitive Recipe Numbers")
Recipe_ordinal["restore"] = RESTORE;
:(before "End Primitive Recipe Implementations")
case RESTORE: {
if (!scalar(ingredients.at(0)))
raise << "restore: illegal operand " << current_instruction().ingredients.at(0).to_string() << '\n';
products.resize(1);
products.at(0).push_back(new_string(slurp("lesson/"+current_instruction().ingredients.at(0).name)));
break;
}
:(code)
string slurp(const string& filename) {
//? cerr << filename << '\n'; //? 1
ostringstream result;
ifstream fin(filename.c_str());
fin.peek();
if (!fin) return result.str(); // don't bother checking errno
const int N = 1024;
char buf[N];
while (!fin.eof()) {
bzero(buf, N);
fin.read(buf, N-1); // leave at least one null
result << buf;
}
fin.close();
//? cerr << "=> " << result.str(); //? 1
return result.str();
}
:(before "End Primitive Recipe Declarations")
SAVE,
:(before "End Primitive Recipe Numbers")
Recipe_ordinal["save"] = SAVE;
:(before "End Primitive Recipe Implementations")
case SAVE: {
if (!scalar(ingredients.at(0)))
raise << "save: illegal operand 0 " << current_instruction().ingredients.at(0).to_string() << '\n';
string filename = current_instruction().ingredients.at(0).name;
if (!is_literal(current_instruction().ingredients.at(0))) {
ostringstream tmp;
tmp << ingredients.at(0).at(0);
filename = tmp.str();
}
ofstream fout(("lesson/"+filename).c_str());
if (!scalar(ingredients.at(1)))
raise << "save: illegal operand 1 " << current_instruction().ingredients.at(1).to_string() << '\n';
string contents = to_string(ingredients.at(1).at(0));
fout << contents;
fout.close();
if (!exists("lesson/.git")) break;
// bug in git: git diff -q messes up --exit-code
int status = system("cd lesson; git add .; git diff HEAD --exit-code >/dev/null || git commit -a -m . >/dev/null");
if (status != 0)
raise << "error in commit: contents " << contents << '\n';
break;
}
:(code)
bool exists(const string& filename) {
struct stat dummy;
return 0 == stat(filename.c_str(), &dummy);
}
:(before "End Includes")
#include<sys/stat.h>
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