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Add :quit command

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This commit is contained in:
Eelco Dolstra 2013-09-09 15:02:56 +02:00
parent a5dffb3d3d
commit 3567bdb514
1 changed files with 36 additions and 19 deletions
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47
nix-repl.cc
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@ -39,7 +39,7 @@ struct NixRepl
void mainLoop(const Strings & args);
void completePrefix(string prefix);
bool getLine(string & line);
void processLine(string line);
bool processLine(string line);
void loadFile(const Path & path);
void addAttrsToScope(Value & attrs);
void addVarToScope(const Symbol & name, Value & v);
@ -95,10 +95,13 @@ void NixRepl::mainLoop(const Strings & args)
while (true) {
string line;
if (!getLine(line)) break;
if (!getLine(line)) {
std::cout << std::endl;
break;
}
try {
processLine(removeWhitespace(line));
if (!processLine(removeWhitespace(line))) return;
} catch (Error & e) {
printMsg(lvlError, "error: " + e.msg());
} catch (Interrupted & e) {
@ -108,7 +111,6 @@ void NixRepl::mainLoop(const Strings & args)
std::cout << std::endl;
}
std::cout << std::endl;
}
@ -255,11 +257,19 @@ bool isVarName(const string & s)
}
void NixRepl::processLine(string line)
bool NixRepl::processLine(string line)
{
if (line == "") return;
if (line == "") return true;
string command = string(line, 0, 2);
string command, arg;
if (line[0] == ':') {
size_t p = line.find(' ');
command = string(line, 0, p);
if (p != string::npos) arg = removeWhitespace(string(line, p));
} else {
arg = line;
}
if (command == ":?") {
cout << "The following commands are available:\n"
@ -270,30 +280,31 @@ void NixRepl::processLine(string line)
<< " :b <expr> Build derivation\n"
<< " :l <path> Load Nix expression and add it to scope\n"
<< " :p <expr> Evaluate and print expression recursively\n"
<< " :q Exit nix-repl\n"
<< " :s <expr> Build dependencies of derivation, then start nix-shell\n"
<< " :t <expr> Describe result of evaluation\n";
}
else if (command == ":a") {
Value v;
evalString(string(line, 2), v);
evalString(arg, v);
addAttrsToScope(v);
}
else if (command == ":l") {
state.resetFileCache();
loadFile(removeWhitespace(string(line, 2)));
loadFile(arg);
}
else if (command == ":t") {
Value v;
evalString(string(line, 2), v);
evalString(arg, v);
std::cout << showType(v) << std::endl;
}
else if (command == ":b" || command == ":s") {
Value v;
evalString(string(line, 2), v);
evalString(arg, v);
DrvInfo drvInfo;
if (!getDerivation(state, v, drvInfo, false))
throw Error("expression does not evaluation to a derivation, so I can't build it");
@ -305,23 +316,27 @@ void NixRepl::processLine(string line)
/* We could do the build in this process using buildPaths(),
but doing it in a child makes it easier to recover from
problems / SIGINT. */
if (runProgram("nix-store", Strings{"-r", drvPath}) != 0) return;
if (runProgram("nix-store", Strings{"-r", drvPath}) == 0) {
Derivation drv = parseDerivation(readFile(drvPath));
std::cout << std::endl << "this derivation produced the following outputs:" << std::endl;
foreach (DerivationOutputs::iterator, i, drv.outputs)
std::cout << format(" %1% -> %2%") % i->first % i->second.path << std::endl;
}
} else
runProgram("nix-shell", Strings{drvPath});
}
else if (command == ":p") {
Value v;
evalString(string(line, 2), v);
evalString(arg, v);
printValue(std::cout, v, 1000000000) << std::endl;
}
else if (string(line, 0, 1) == ":")
throw Error(format("unknown command ‘%1%’") % string(line, 0, 2));
else if (command == ":q" || command == ":quit")
return false;
else if (command != "")
throw Error(format("unknown command ‘%1%’") % command);
else {
size_t p = line.find('=');
@ -341,6 +356,8 @@ void NixRepl::processLine(string line)
printValue(std::cout, v, 1) << std::endl;
}
}
return true;
}