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Refactor option handling

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This commit is contained in:
Eelco Dolstra 2014-08-13 03:50:44 +02:00
parent 5bed74d1b0
commit 47e185847e
10 changed files with 503 additions and 531 deletions
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194
src/nix-instantiate/nix-instantiate.cc
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@ -18,12 +18,6 @@
using namespace nix;
void printHelp()
{
showManPage("nix-instantiate");
}
static Expr * parseStdin(EvalState & state)
{
startNest(nest, lvlTalkative, format("parsing standard input"));
@ -95,112 +89,108 @@ void processExpr(EvalState & state, const Strings & attrPaths,
}
void run(Strings args)
int main(int argc, char * * argv)
{
/* FIXME: hack. */
Strings searchPath;
Strings args2;
for (Strings::iterator i = args.begin(); i != args.end(); ) {
string arg = *i++;
if (!parseSearchPathArg(arg, i, args.end(), searchPath))
args2.push_back(arg);
}
args = args2;
return handleExceptions(argv[0], [&]() {
initNix();
EvalState state(searchPath);
Strings files;
bool readStdin = false;
bool fromArgs = false;
bool findFile = false;
bool evalOnly = false;
bool parseOnly = false;
OutputKind outputKind = okPlain;
bool xmlOutputSourceLocation = true;
bool strict = false;
Strings attrPaths;
Bindings autoArgs;
bool wantsReadWrite = false;
Strings files, searchPath;
bool readStdin = false;
bool fromArgs = false;
bool findFile = false;
bool evalOnly = false;
bool parseOnly = false;
OutputKind outputKind = okPlain;
bool xmlOutputSourceLocation = true;
bool strict = false;
Strings attrPaths;
bool wantsReadWrite = false;
std::map<string, string> autoArgs_;
bool repair = false;
for (Strings::iterator i = args.begin(); i != args.end(); ) {
string arg = *i++;
parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
if (*arg == "--help")
showManPage("nix-instantiate");
else if (*arg == "--version")
printVersion("nix-instantiate");
else if (*arg == "-")
readStdin = true;
else if (*arg == "--expr" || *arg == "-E")
fromArgs = true;
else if (*arg == "--eval" || *arg == "--eval-only")
evalOnly = true;
else if (*arg == "--read-write-mode")
wantsReadWrite = true;
else if (*arg == "--parse" || *arg == "--parse-only")
parseOnly = evalOnly = true;
else if (*arg == "--find-file")
findFile = true;
else if (*arg == "--attr" || *arg == "-A")
attrPaths.push_back(getArg(*arg, arg, end));
else if (parseAutoArgs(arg, end, autoArgs_))
;
else if (parseSearchPathArg(arg, end, searchPath))
;
else if (*arg == "--add-root")
gcRoot = getArg(*arg, arg, end);
else if (*arg == "--indirect")
indirectRoot = true;
else if (*arg == "--xml")
outputKind = okXML;
else if (*arg == "--json")
outputKind = okJSON;
else if (*arg == "--no-location")
xmlOutputSourceLocation = false;
else if (*arg == "--strict")
strict = true;
else if (*arg == "--repair")
repair = true;
else if (*arg == "--dry-run")
settings.readOnlyMode = true;
else if (*arg != "" && arg->at(0) == '-')
return false;
else
files.push_back(*arg);
return true;
});
if (arg == "-")
readStdin = true;
else if (arg == "--expr" || arg == "-E")
fromArgs = true;
else if (arg == "--eval" || arg == "--eval-only")
evalOnly = true;
else if (arg == "--read-write-mode")
wantsReadWrite = true;
else if (arg == "--parse" || arg == "--parse-only")
parseOnly = evalOnly = true;
else if (arg == "--find-file")
findFile = true;
else if (arg == "--attr" || arg == "-A") {
if (i == args.end())
throw UsageError("`--attr' requires an argument");
attrPaths.push_back(*i++);
}
else if (parseOptionArg(arg, i, args.end(), state, autoArgs))
;
else if (arg == "--add-root") {
if (i == args.end())
throw UsageError("`--add-root' requires an argument");
gcRoot = absPath(*i++);
}
else if (arg == "--indirect")
indirectRoot = true;
else if (arg == "--xml")
outputKind = okXML;
else if (arg == "--json")
outputKind = okJSON;
else if (arg == "--no-location")
xmlOutputSourceLocation = false;
else if (arg == "--strict")
strict = true;
else if (arg == "--repair")
state.repair = true;
else if (arg == "--dry-run")
EvalState state(searchPath);
state.repair = repair;
Bindings autoArgs;
evalAutoArgs(state, autoArgs_, autoArgs);
if (evalOnly && !wantsReadWrite)
settings.readOnlyMode = true;
else if (arg[0] == '-')
throw UsageError(format("unknown flag `%1%'") % arg);
else
files.push_back(arg);
}
if (evalOnly && !wantsReadWrite)
settings.readOnlyMode = true;
if (attrPaths.empty()) attrPaths.push_back("");
if (attrPaths.empty()) attrPaths.push_back("");
if (findFile) {
foreach (Strings::iterator, i, files) {
Path p = state.findFile(*i);
if (p == "") throw Error(format("unable to find `%1%'") % *i);
std::cout << p << std::endl;
if (findFile) {
foreach (Strings::iterator, i, files) {
Path p = state.findFile(*i);
if (p == "") throw Error(format("unable to find `%1%'") % *i);
std::cout << p << std::endl;
}
return;
}
return;
}
store = openStore();
store = openStore();
if (readStdin) {
Expr * e = parseStdin(state);
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, outputKind, xmlOutputSourceLocation, e);
} else if (files.empty() && !fromArgs)
files.push_back("./default.nix");
if (readStdin) {
Expr * e = parseStdin(state);
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, outputKind, xmlOutputSourceLocation, e);
} else if (files.empty() && !fromArgs)
files.push_back("./default.nix");
foreach (Strings::iterator, i, files) {
Expr * e = fromArgs
? state.parseExprFromString(*i, absPath("."))
: state.parseExprFromFile(resolveExprPath(lookupFileArg(state, *i)));
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, outputKind, xmlOutputSourceLocation, e);
}
foreach (Strings::iterator, i, files) {
Expr * e = fromArgs
? state.parseExprFromString(*i, absPath("."))
: state.parseExprFromFile(resolveExprPath(lookupFileArg(state, *i)));
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, outputKind, xmlOutputSourceLocation, e);
}
state.printStats();
state.printStats();
});
}
string programId = "nix-instantiate";