719 lines
21 KiB
C++
719 lines
21 KiB
C++
#include <nix/config.h>
|
||
|
||
#include <iostream>
|
||
#include <cstdlib>
|
||
|
||
#include <setjmp.h>
|
||
|
||
#include <readline/readline.h>
|
||
#include <readline/history.h>
|
||
|
||
#include "shared.hh"
|
||
#include "eval.hh"
|
||
#include "eval-inline.hh"
|
||
#include "store-api.hh"
|
||
#include "common-opts.hh"
|
||
#include "get-drvs.hh"
|
||
#include "derivations.hh"
|
||
#include "affinity.hh"
|
||
#include "globals.hh"
|
||
|
||
using namespace std;
|
||
using namespace nix;
|
||
|
||
#define ESC_RED "\033[31m"
|
||
#define ESC_GRE "\033[32m"
|
||
#define ESC_YEL "\033[33m"
|
||
#define ESC_BLU "\033[34;1m"
|
||
#define ESC_MAG "\033[35m"
|
||
#define ESC_CYA "\033[36m"
|
||
#define ESC_END "\033[0m"
|
||
|
||
string programId = "nix-repl";
|
||
const string historyFile = string(getenv("HOME")) + "/.nix-repl-history";
|
||
|
||
struct NixRepl
|
||
{
|
||
string curDir;
|
||
EvalState state;
|
||
|
||
Strings loadedFiles;
|
||
|
||
const static int envSize = 32768;
|
||
StaticEnv staticEnv;
|
||
Env * env;
|
||
int displ;
|
||
StringSet varNames;
|
||
|
||
StringSet completions;
|
||
StringSet::iterator curCompletion;
|
||
|
||
NixRepl(const Strings & searchPath, nix::ref<Store> store);
|
||
void mainLoop(const Strings & files);
|
||
void completePrefix(string prefix);
|
||
bool getLine(string & input, const char * prompt);
|
||
Path getDerivationPath(Value & v);
|
||
bool processLine(string line);
|
||
void loadFile(const Path & path);
|
||
void initEnv();
|
||
void reloadFiles();
|
||
void addAttrsToScope(Value & attrs);
|
||
void addVarToScope(const Symbol & name, Value & v);
|
||
Expr * parseString(string s);
|
||
void evalString(string s, Value & v);
|
||
|
||
typedef set<Value *> ValuesSeen;
|
||
std::ostream & printValue(std::ostream & str, Value & v, unsigned int maxDepth);
|
||
std::ostream & printValue(std::ostream & str, Value & v, unsigned int maxDepth, ValuesSeen & seen);
|
||
};
|
||
|
||
|
||
void printHelp()
|
||
{
|
||
cout << "Usage: nix-repl [--help] [--version] [-I path] paths...\n"
|
||
<< "\n"
|
||
<< "nix-repl is a simple read-eval-print loop (REPL) for the Nix package manager.\n"
|
||
<< "\n"
|
||
<< "Options:\n"
|
||
<< " --help\n"
|
||
<< " Prints out a summary of the command syntax and exits.\n"
|
||
<< "\n"
|
||
<< " --version\n"
|
||
<< " Prints out the Nix version number on standard output and exits.\n"
|
||
<< "\n"
|
||
<< " -I path\n"
|
||
<< " Add a path to the Nix expression search path. This option may be given\n"
|
||
<< " multiple times. See the NIX_PATH environment variable for information on\n"
|
||
<< " the semantics of the Nix search path. Paths added through -I take\n"
|
||
<< " precedence over NIX_PATH.\n"
|
||
<< "\n"
|
||
<< " paths...\n"
|
||
<< " A list of paths to files containing Nix expressions which nix-repl will\n"
|
||
<< " load and add to its scope.\n"
|
||
<< "\n"
|
||
<< " A path surrounded in < and > will be looked up in the Nix expression search\n"
|
||
<< " path, as in the Nix language itself.\n"
|
||
<< "\n"
|
||
<< " If an element of paths starts with http:// or https://, it is interpreted\n"
|
||
<< " as the URL of a tarball that will be downloaded and unpacked to a temporary\n"
|
||
<< " location. The tarball must include a single top-level directory containing\n"
|
||
<< " at least a file named default.nix.\n"
|
||
<< flush;
|
||
}
|
||
|
||
|
||
string removeWhitespace(string s)
|
||
{
|
||
s = chomp(s);
|
||
size_t n = s.find_first_not_of(" \n\r\t");
|
||
if (n != string::npos) s = string(s, n);
|
||
return s;
|
||
}
|
||
|
||
|
||
NixRepl::NixRepl(const Strings & searchPath, nix::ref<Store> store)
|
||
: state(searchPath, store)
|
||
, staticEnv(false, &state.staticBaseEnv)
|
||
{
|
||
curDir = absPath(".");
|
||
}
|
||
|
||
|
||
void NixRepl::mainLoop(const Strings & files)
|
||
{
|
||
string error = ANSI_RED "error:" ANSI_NORMAL " ";
|
||
std::cout << "Welcome to Nix version " << NIX_VERSION << ". Type :? for help." << std::endl << std::endl;
|
||
|
||
for (auto & i : files)
|
||
loadedFiles.push_back(i);
|
||
|
||
reloadFiles();
|
||
if (!loadedFiles.empty()) std::cout << std::endl;
|
||
|
||
// Allow nix-repl specific settings in .inputrc
|
||
rl_readline_name = "nix-repl";
|
||
using_history();
|
||
read_history(historyFile.c_str());
|
||
|
||
string input;
|
||
|
||
while (true) {
|
||
// When continuing input from previous lines, don't print a prompt, just align to the same
|
||
// number of chars as the prompt.
|
||
const char * prompt = input.empty() ? "nix-repl> " : " ";
|
||
if (!getLine(input, prompt)) {
|
||
std::cout << std::endl;
|
||
break;
|
||
}
|
||
|
||
try {
|
||
if (!removeWhitespace(input).empty() && !processLine(input)) return;
|
||
} catch (ParseError & e) {
|
||
if (e.msg().find("unexpected $end") != std::string::npos) {
|
||
// For parse errors on incomplete input, we continue waiting for the next line of
|
||
// input without clearing the input so far.
|
||
continue;
|
||
} else {
|
||
printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
|
||
}
|
||
} catch (Error & e) {
|
||
printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
|
||
} catch (Interrupted & e) {
|
||
printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
|
||
}
|
||
|
||
// We handled the current input fully, so we should clear it and read brand new input.
|
||
input.clear();
|
||
std::cout << std::endl;
|
||
}
|
||
}
|
||
|
||
|
||
/* Apparently, the only way to get readline() to return on Ctrl-C
|
||
(SIGINT) is to use siglongjmp(). That's fucked up... */
|
||
static sigjmp_buf sigintJmpBuf;
|
||
|
||
|
||
static void sigintHandler(int signo)
|
||
{
|
||
siglongjmp(sigintJmpBuf, 1);
|
||
}
|
||
|
||
|
||
/* Oh, if only g++ had nested functions... */
|
||
NixRepl * curRepl;
|
||
|
||
char * completerThunk(const char * s, int state)
|
||
{
|
||
string prefix(s);
|
||
|
||
/* If the prefix has a slash in it, use readline's builtin filename
|
||
completer. */
|
||
if (prefix.find('/') != string::npos)
|
||
return rl_filename_completion_function(s, state);
|
||
|
||
/* Otherwise, return all symbols that start with the prefix. */
|
||
if (state == 0) {
|
||
curRepl->completePrefix(s);
|
||
curRepl->curCompletion = curRepl->completions.begin();
|
||
}
|
||
if (curRepl->curCompletion == curRepl->completions.end()) return 0;
|
||
return strdup((curRepl->curCompletion++)->c_str());
|
||
}
|
||
|
||
|
||
bool NixRepl::getLine(string & input, const char * prompt)
|
||
{
|
||
struct sigaction act, old;
|
||
act.sa_handler = sigintHandler;
|
||
sigfillset(&act.sa_mask);
|
||
act.sa_flags = 0;
|
||
if (sigaction(SIGINT, &act, &old))
|
||
throw SysError("installing handler for SIGINT");
|
||
|
||
if (sigsetjmp(sigintJmpBuf, 1)) {
|
||
input.clear();
|
||
} else {
|
||
curRepl = this;
|
||
rl_completion_entry_function = completerThunk;
|
||
|
||
char * s = readline(prompt);
|
||
if (!s) return false;
|
||
input.append(s);
|
||
input.push_back('\n');
|
||
if (!removeWhitespace(s).empty()) {
|
||
add_history(s);
|
||
append_history(1, 0);
|
||
}
|
||
free(s);
|
||
}
|
||
|
||
_isInterrupted = 0;
|
||
|
||
if (sigaction(SIGINT, &old, 0))
|
||
throw SysError("restoring handler for SIGINT");
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
void NixRepl::completePrefix(string prefix)
|
||
{
|
||
completions.clear();
|
||
|
||
size_t dot = prefix.rfind('.');
|
||
|
||
if (dot == string::npos) {
|
||
/* This is a variable name; look it up in the current scope. */
|
||
StringSet::iterator i = varNames.lower_bound(prefix);
|
||
while (i != varNames.end()) {
|
||
if (string(*i, 0, prefix.size()) != prefix) break;
|
||
completions.insert(*i);
|
||
i++;
|
||
}
|
||
} else {
|
||
try {
|
||
/* This is an expression that should evaluate to an
|
||
attribute set. Evaluate it to get the names of the
|
||
attributes. */
|
||
string expr(prefix, 0, dot);
|
||
string prefix2 = string(prefix, dot + 1);
|
||
|
||
Expr * e = parseString(expr);
|
||
Value v;
|
||
e->eval(state, *env, v);
|
||
state.forceAttrs(v);
|
||
|
||
for (auto & i : *v.attrs) {
|
||
string name = i.name;
|
||
if (string(name, 0, prefix2.size()) != prefix2) continue;
|
||
completions.insert(expr + "." + name);
|
||
}
|
||
|
||
} catch (ParseError & e) {
|
||
// Quietly ignore parse errors.
|
||
} catch (EvalError & e) {
|
||
// Quietly ignore evaluation errors.
|
||
} catch (UndefinedVarError & e) {
|
||
// Quietly ignore undefined variable errors.
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
static int runProgram(const string & program, const Strings & args)
|
||
{
|
||
std::vector<const char *> cargs; /* careful with c_str()! */
|
||
cargs.push_back(program.c_str());
|
||
for (Strings::const_iterator i = args.begin(); i != args.end(); ++i)
|
||
cargs.push_back(i->c_str());
|
||
cargs.push_back(0);
|
||
|
||
Pid pid;
|
||
pid = fork();
|
||
if (pid == -1) throw SysError("forking");
|
||
if (pid == 0) {
|
||
restoreAffinity();
|
||
execvp(program.c_str(), (char * *) &cargs[0]);
|
||
_exit(1);
|
||
}
|
||
|
||
return pid.wait();
|
||
}
|
||
|
||
|
||
bool isVarName(const string & s)
|
||
{
|
||
if (s.size() == 0) return false;
|
||
char c = s[0];
|
||
if ((c >= '0' && c <= '9') || c == '-' || c == '\'') return false;
|
||
for (auto & i : s)
|
||
if (!((i >= 'a' && i <= 'z') ||
|
||
(i >= 'A' && i <= 'Z') ||
|
||
(i >= '0' && i <= '9') ||
|
||
i == '_' || i == '-' || i == '\''))
|
||
return false;
|
||
return true;
|
||
}
|
||
|
||
|
||
Path NixRepl::getDerivationPath(Value & v) {
|
||
DrvInfo drvInfo(state);
|
||
if (!getDerivation(state, v, drvInfo, false))
|
||
throw Error("expression does not evaluate to a derivation, so I can't build it");
|
||
Path drvPath = drvInfo.queryDrvPath();
|
||
if (drvPath == "" || !state.store->isValidPath(drvPath))
|
||
throw Error("expression did not evaluate to a valid derivation");
|
||
return drvPath;
|
||
}
|
||
|
||
|
||
bool NixRepl::processLine(string line)
|
||
{
|
||
if (line == "") return true;
|
||
|
||
string command, arg;
|
||
|
||
if (line[0] == ':') {
|
||
size_t p = line.find_first_of(" \n\r\t");
|
||
command = string(line, 0, p);
|
||
if (p != string::npos) arg = removeWhitespace(string(line, p));
|
||
} else {
|
||
arg = line;
|
||
}
|
||
|
||
if (command == ":?" || command == ":help") {
|
||
cout << "The following commands are available:\n"
|
||
<< "\n"
|
||
<< " <expr> Evaluate and print expression\n"
|
||
<< " <x> = <expr> Bind expression to variable\n"
|
||
<< " :a <expr> Add attributes from resulting set to scope\n"
|
||
<< " :b <expr> Build derivation\n"
|
||
<< " :i <expr> Build derivation, then install result into current profile\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"
|
||
<< " :r Reload all files\n"
|
||
<< " :s <expr> Build dependencies of derivation, then start nix-shell\n"
|
||
<< " :t <expr> Describe result of evaluation\n"
|
||
<< " :u <expr> Build derivation, then start nix-shell\n";
|
||
}
|
||
|
||
else if (command == ":a" || command == ":add") {
|
||
Value v;
|
||
evalString(arg, v);
|
||
addAttrsToScope(v);
|
||
}
|
||
|
||
else if (command == ":l" || command == ":load") {
|
||
state.resetFileCache();
|
||
loadFile(arg);
|
||
}
|
||
|
||
else if (command == ":r" || command == ":reload") {
|
||
state.resetFileCache();
|
||
reloadFiles();
|
||
}
|
||
|
||
else if (command == ":t") {
|
||
Value v;
|
||
evalString(arg, v);
|
||
std::cout << showType(v) << std::endl;
|
||
|
||
} else if (command == ":u") {
|
||
Value v, f, result;
|
||
evalString(arg, v);
|
||
evalString("drv: (import <nixpkgs> {}).runCommand \"shell\" { buildInputs = [ drv ]; } \"\"", f);
|
||
state.callFunction(f, v, result, Pos());
|
||
|
||
Path drvPath = getDerivationPath(result);
|
||
runProgram("nix-shell", Strings{drvPath});
|
||
}
|
||
|
||
else if (command == ":b" || command == ":i" || command == ":s") {
|
||
Value v;
|
||
evalString(arg, v);
|
||
Path drvPath = getDerivationPath(v);
|
||
|
||
if (command == ":b") {
|
||
/* 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) {
|
||
Derivation drv = readDerivation(drvPath);
|
||
std::cout << std::endl << "this derivation produced the following outputs:" << std::endl;
|
||
for (auto & i : drv.outputs)
|
||
std::cout << format(" %1% -> %2%") % i.first % i.second.path << std::endl;
|
||
}
|
||
} else if (command == ":i") {
|
||
runProgram("nix-env", Strings{"-i", drvPath});
|
||
} else {
|
||
runProgram("nix-shell", Strings{drvPath});
|
||
}
|
||
}
|
||
|
||
else if (command == ":p" || command == ":print") {
|
||
Value v;
|
||
evalString(arg, v);
|
||
printValue(std::cout, v, 1000000000) << std::endl;
|
||
}
|
||
|
||
else if (command == ":q" || command == ":quit")
|
||
return false;
|
||
|
||
else if (command != "")
|
||
throw Error(format("unknown command ‘%1%’") % command);
|
||
|
||
else {
|
||
size_t p = line.find('=');
|
||
string name;
|
||
if (p != string::npos &&
|
||
p < line.size() &&
|
||
line[p + 1] != '=' &&
|
||
isVarName(name = removeWhitespace(string(line, 0, p))))
|
||
{
|
||
Expr * e = parseString(string(line, p + 1));
|
||
Value & v(*state.allocValue());
|
||
v.type = tThunk;
|
||
v.thunk.env = env;
|
||
v.thunk.expr = e;
|
||
addVarToScope(state.symbols.create(name), v);
|
||
} else {
|
||
Value v;
|
||
evalString(line, v);
|
||
printValue(std::cout, v, 1) << std::endl;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
void NixRepl::loadFile(const Path & path)
|
||
{
|
||
loadedFiles.remove(path);
|
||
loadedFiles.push_back(path);
|
||
Value v, v2;
|
||
state.evalFile(lookupFileArg(state, path), v);
|
||
Bindings & bindings(*state.allocBindings(0));
|
||
state.autoCallFunction(bindings, v, v2);
|
||
addAttrsToScope(v2);
|
||
}
|
||
|
||
|
||
void NixRepl::initEnv()
|
||
{
|
||
env = &state.allocEnv(envSize);
|
||
env->up = &state.baseEnv;
|
||
displ = 0;
|
||
staticEnv.vars.clear();
|
||
|
||
varNames.clear();
|
||
for (auto & i : state.staticBaseEnv.vars)
|
||
varNames.insert(i.first);
|
||
}
|
||
|
||
|
||
void NixRepl::reloadFiles()
|
||
{
|
||
initEnv();
|
||
|
||
Strings old = loadedFiles;
|
||
loadedFiles.clear();
|
||
|
||
bool first = true;
|
||
for (auto & i : old) {
|
||
if (!first) std::cout << std::endl;
|
||
first = false;
|
||
std::cout << format("Loading ‘%1%’...") % i << std::endl;
|
||
loadFile(i);
|
||
}
|
||
}
|
||
|
||
|
||
void NixRepl::addAttrsToScope(Value & attrs)
|
||
{
|
||
state.forceAttrs(attrs);
|
||
for (auto & i : *attrs.attrs)
|
||
addVarToScope(i.name, *i.value);
|
||
std::cout << format("Added %1% variables.") % attrs.attrs->size() << std::endl;
|
||
}
|
||
|
||
|
||
void NixRepl::addVarToScope(const Symbol & name, Value & v)
|
||
{
|
||
if (displ >= envSize)
|
||
throw Error("environment full; cannot add more variables");
|
||
staticEnv.vars[name] = displ;
|
||
env->values[displ++] = &v;
|
||
varNames.insert((string) name);
|
||
}
|
||
|
||
|
||
Expr * NixRepl::parseString(string s)
|
||
{
|
||
Expr * e = state.parseExprFromString(s, curDir, staticEnv);
|
||
return e;
|
||
}
|
||
|
||
|
||
void NixRepl::evalString(string s, Value & v)
|
||
{
|
||
Expr * e = parseString(s);
|
||
e->eval(state, *env, v);
|
||
state.forceValue(v);
|
||
}
|
||
|
||
|
||
std::ostream & NixRepl::printValue(std::ostream & str, Value & v, unsigned int maxDepth)
|
||
{
|
||
ValuesSeen seen;
|
||
return printValue(str, v, maxDepth, seen);
|
||
}
|
||
|
||
|
||
std::ostream & printStringValue(std::ostream & str, const char * string) {
|
||
str << "\"";
|
||
for (const char * i = string; *i; i++)
|
||
if (*i == '\"' || *i == '\\') str << "\\" << *i;
|
||
else if (*i == '\n') str << "\\n";
|
||
else if (*i == '\r') str << "\\r";
|
||
else if (*i == '\t') str << "\\t";
|
||
else str << *i;
|
||
str << "\"";
|
||
return str;
|
||
}
|
||
|
||
|
||
// FIXME: lot of cut&paste from Nix's eval.cc.
|
||
std::ostream & NixRepl::printValue(std::ostream & str, Value & v, unsigned int maxDepth, ValuesSeen & seen)
|
||
{
|
||
str.flush();
|
||
checkInterrupt();
|
||
|
||
state.forceValue(v);
|
||
|
||
switch (v.type) {
|
||
|
||
case tInt:
|
||
str << ESC_CYA << v.integer << ESC_END;
|
||
break;
|
||
|
||
case tBool:
|
||
str << ESC_CYA << (v.boolean ? "true" : "false") << ESC_END;
|
||
break;
|
||
|
||
case tString:
|
||
str << ESC_YEL;
|
||
printStringValue(str, v.string.s);
|
||
str << ESC_END;
|
||
break;
|
||
|
||
case tPath:
|
||
str << ESC_GRE << v.path << ESC_END; // !!! escaping?
|
||
break;
|
||
|
||
case tNull:
|
||
str << ESC_CYA "null" ESC_END;
|
||
break;
|
||
|
||
case tAttrs: {
|
||
seen.insert(&v);
|
||
|
||
bool isDrv = state.isDerivation(v);
|
||
|
||
if (isDrv) {
|
||
str << "«derivation ";
|
||
Bindings::iterator i = v.attrs->find(state.sDrvPath);
|
||
PathSet context;
|
||
Path drvPath = i != v.attrs->end() ? state.coerceToPath(*i->pos, *i->value, context) : "???";
|
||
str << drvPath << "»";
|
||
}
|
||
|
||
else if (maxDepth > 0) {
|
||
str << "{ ";
|
||
|
||
typedef std::map<string, Value *> Sorted;
|
||
Sorted sorted;
|
||
for (auto & i : *v.attrs)
|
||
sorted[i.name] = i.value;
|
||
|
||
/* If this is a derivation, then don't show the
|
||
self-references ("all", "out", etc.). */
|
||
StringSet hidden;
|
||
if (isDrv) {
|
||
hidden.insert("all");
|
||
Bindings::iterator i = v.attrs->find(state.sOutputs);
|
||
if (i == v.attrs->end())
|
||
hidden.insert("out");
|
||
else {
|
||
state.forceList(*i->value);
|
||
for (unsigned int j = 0; j < i->value->listSize(); ++j)
|
||
hidden.insert(state.forceStringNoCtx(*i->value->listElems()[j]));
|
||
}
|
||
}
|
||
|
||
for (auto & i : sorted) {
|
||
if (isVarName(i.first))
|
||
str << i.first;
|
||
else
|
||
printStringValue(str, i.first.c_str());
|
||
str << " = ";
|
||
if (hidden.find(i.first) != hidden.end())
|
||
str << "«...»";
|
||
else if (seen.find(i.second) != seen.end())
|
||
str << "«repeated»";
|
||
else
|
||
try {
|
||
printValue(str, *i.second, maxDepth - 1, seen);
|
||
} catch (AssertionError & e) {
|
||
str << ESC_RED "«error: " << e.msg() << "»" ESC_END;
|
||
}
|
||
str << "; ";
|
||
}
|
||
|
||
str << "}";
|
||
} else
|
||
str << "{ ... }";
|
||
|
||
break;
|
||
}
|
||
|
||
case tList1:
|
||
case tList2:
|
||
case tListN:
|
||
seen.insert(&v);
|
||
|
||
str << "[ ";
|
||
if (maxDepth > 0)
|
||
for (unsigned int n = 0; n < v.listSize(); ++n) {
|
||
if (seen.find(v.listElems()[n]) != seen.end())
|
||
str << "«repeated»";
|
||
else
|
||
try {
|
||
printValue(str, *v.listElems()[n], maxDepth - 1, seen);
|
||
} catch (AssertionError & e) {
|
||
str << ESC_RED "«error: " << e.msg() << "»" ESC_END;
|
||
}
|
||
str << " ";
|
||
}
|
||
else
|
||
str << "... ";
|
||
str << "]";
|
||
break;
|
||
|
||
case tLambda: {
|
||
std::ostringstream s;
|
||
s << v.lambda.fun->pos;
|
||
str << ESC_BLU "«lambda @ " << filterANSIEscapes(s.str()) << "»" ESC_END;
|
||
break;
|
||
}
|
||
|
||
case tPrimOp:
|
||
str << ESC_MAG "«primop»" ESC_END;
|
||
break;
|
||
|
||
case tPrimOpApp:
|
||
str << ESC_BLU "«primop-app»" ESC_END;
|
||
break;
|
||
|
||
default:
|
||
str << ESC_RED "«unknown»" ESC_END;
|
||
break;
|
||
}
|
||
|
||
return str;
|
||
}
|
||
|
||
|
||
int main(int argc, char * * argv)
|
||
{
|
||
return handleExceptions(argv[0], [&]() {
|
||
initNix();
|
||
initGC();
|
||
|
||
Strings files, searchPath;
|
||
|
||
parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
|
||
if (*arg == "--version")
|
||
printVersion("nix-repl");
|
||
else if (*arg == "--help") {
|
||
printHelp();
|
||
// exit with 0 since user asked for help
|
||
_exit(0);
|
||
}
|
||
else if (parseSearchPathArg(arg, end, searchPath))
|
||
;
|
||
else if (*arg != "" && arg->at(0) == '-')
|
||
return false;
|
||
else
|
||
files.push_back(*arg);
|
||
return true;
|
||
});
|
||
|
||
NixRepl repl(searchPath, openStore());
|
||
repl.mainLoop(files);
|
||
|
||
write_history(historyFile.c_str());
|
||
});
|
||
}
|