119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
//: 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")
|
|
put(Recipe_ordinal, "restore", RESTORE);
|
|
:(before "End Primitive Recipe Checks")
|
|
case RESTORE: {
|
|
if (SIZE(inst.ingredients) != 1) {
|
|
raise << maybe(get(Recipe, r).name) << "'restore' requires exactly one ingredient, but got '" << inst.original_string << "'\n" << end();
|
|
break;
|
|
}
|
|
string filename;
|
|
if (is_literal_text(inst.ingredients.at(0))) {
|
|
;
|
|
}
|
|
else if (is_mu_text(inst.ingredients.at(0))) {
|
|
;
|
|
}
|
|
else {
|
|
raise << maybe(get(Recipe, r).name) << "first ingredient of 'restore' should be a string, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
:(before "End Primitive Recipe Implementations")
|
|
case RESTORE: {
|
|
string filename;
|
|
if (is_literal_text(current_instruction().ingredients.at(0))) {
|
|
filename = current_instruction().ingredients.at(0).name;
|
|
}
|
|
else if (is_mu_text(current_instruction().ingredients.at(0))) {
|
|
filename = read_mu_text(ingredients.at(0).at(0));
|
|
}
|
|
if (Current_scenario) {
|
|
// do nothing in tests
|
|
products.resize(1);
|
|
products.at(0).push_back(0);
|
|
break;
|
|
}
|
|
string contents = slurp("lesson/"+filename);
|
|
products.resize(1);
|
|
if (contents.empty())
|
|
products.at(0).push_back(0);
|
|
else
|
|
products.at(0).push_back(new_mu_text(contents));
|
|
break;
|
|
}
|
|
|
|
:(code)
|
|
// http://cpp.indi.frih.net/blog/2014/09/how-to-read-an-entire-file-into-memory-in-cpp
|
|
string slurp(const string& filename) {
|
|
ifstream fin(filename.c_str());
|
|
fin.peek();
|
|
if (!fin) return ""; // don't bother checking errno
|
|
ostringstream result;
|
|
result << fin.rdbuf();
|
|
fin.close();
|
|
return result.str();
|
|
}
|
|
|
|
:(before "End Primitive Recipe Declarations")
|
|
SAVE,
|
|
:(before "End Primitive Recipe Numbers")
|
|
put(Recipe_ordinal, "save", SAVE);
|
|
:(before "End Primitive Recipe Checks")
|
|
case SAVE: {
|
|
if (SIZE(inst.ingredients) != 2) {
|
|
raise << maybe(get(Recipe, r).name) << "'save' requires exactly two ingredients, but got '" << inst.original_string << "'\n" << end();
|
|
break;
|
|
}
|
|
if (is_literal_text(inst.ingredients.at(0))) {
|
|
;
|
|
}
|
|
else if (is_mu_text(inst.ingredients.at(0))) {
|
|
;
|
|
}
|
|
else {
|
|
raise << maybe(get(Recipe, r).name) << "first ingredient of 'save' should be a string, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
|
|
break;
|
|
}
|
|
if (!is_mu_text(inst.ingredients.at(1))) {
|
|
raise << maybe(get(Recipe, r).name) << "second ingredient of 'save' should be an address:@:char, but got '" << to_string(inst.ingredients.at(1)) << "'\n" << end();
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
:(before "End Primitive Recipe Implementations")
|
|
case SAVE: {
|
|
if (Current_scenario) break; // do nothing in tests
|
|
string filename;
|
|
if (is_literal_text(current_instruction().ingredients.at(0))) {
|
|
filename = current_instruction().ingredients.at(0).name;
|
|
}
|
|
else if (is_mu_text(current_instruction().ingredients.at(0))) {
|
|
filename = read_mu_text(ingredients.at(0).at(0));
|
|
}
|
|
ofstream fout(("lesson/"+filename).c_str());
|
|
if (!fout) break;
|
|
string contents = read_mu_text(ingredients.at(1).at(0));
|
|
fout << contents;
|
|
fout.close();
|
|
if (!exists("lesson/.git")) break;
|
|
// bug in git: git diff -q messes up --exit-code
|
|
// explicitly say '--all' for git 1.9
|
|
int status = system("cd lesson; git add --all .; git diff HEAD --exit-code >/dev/null || git commit -a -m . >/dev/null");
|
|
if (status != 0)
|
|
raise << "error in commit: contents " << contents << '\n' << end();
|
|
break;
|
|
}
|
|
|
|
:(code)
|
|
bool exists(const string& filename) {
|
|
struct stat dummy;
|
|
return 0 == stat(filename.c_str(), &dummy);
|
|
}
|