forked from lix-project/lix
c94f3d5575
This adds about 0.1s to nix-shell runtime in the case where bashInteractive already exists. See discussion at https://github.com/NixOS/nixpkgs/issues/27493.
690 lines
20 KiB
C++
690 lines
20 KiB
C++
#include <iostream>
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#include <cstdlib>
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#include <setjmp.h>
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#include "shared.hh"
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#include "eval.hh"
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#include "eval-inline.hh"
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#include "store-api.hh"
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#include "common-opts.hh"
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#include "get-drvs.hh"
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#include "derivations.hh"
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#include "affinity.hh"
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#include "globals.hh"
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#include "command.hh"
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#include "finally.hh"
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#include "src/linenoise/linenoise.h"
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namespace nix {
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#define ESC_RED "\033[31m"
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#define ESC_GRE "\033[32m"
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#define ESC_YEL "\033[33m"
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#define ESC_BLU "\033[34;1m"
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#define ESC_MAG "\033[35m"
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#define ESC_CYA "\033[36m"
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#define ESC_END "\033[0m"
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struct NixRepl
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{
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string curDir;
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EvalState state;
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Strings loadedFiles;
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const static int envSize = 32768;
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StaticEnv staticEnv;
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Env * env;
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int displ;
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StringSet varNames;
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const Path historyFile;
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NixRepl(const Strings & searchPath, nix::ref<Store> store);
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~NixRepl();
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void mainLoop(const Strings & files);
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StringSet completePrefix(string prefix);
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bool getLine(string & input, const std::string &prompt);
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Path getDerivationPath(Value & v);
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bool processLine(string line);
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void loadFile(const Path & path);
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void initEnv();
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void reloadFiles();
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void addAttrsToScope(Value & attrs);
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void addVarToScope(const Symbol & name, Value & v);
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Expr * parseString(string s);
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void evalString(string s, Value & v);
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typedef set<Value *> ValuesSeen;
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std::ostream & printValue(std::ostream & str, Value & v, unsigned int maxDepth);
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std::ostream & printValue(std::ostream & str, Value & v, unsigned int maxDepth, ValuesSeen & seen);
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};
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void printHelp()
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{
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std::cout
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<< "Usage: nix-repl [--help] [--version] [-I path] paths...\n"
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<< "\n"
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<< "nix-repl is a simple read-eval-print loop (REPL) for the Nix package manager.\n"
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<< "\n"
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<< "Options:\n"
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<< " --help\n"
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<< " Prints out a summary of the command syntax and exits.\n"
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<< "\n"
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<< " --version\n"
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<< " Prints out the Nix version number on standard output and exits.\n"
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<< "\n"
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<< " -I path\n"
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<< " Add a path to the Nix expression search path. This option may be given\n"
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<< " multiple times. See the NIX_PATH environment variable for information on\n"
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<< " the semantics of the Nix search path. Paths added through -I take\n"
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<< " precedence over NIX_PATH.\n"
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<< "\n"
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<< " paths...\n"
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<< " A list of paths to files containing Nix expressions which nix-repl will\n"
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<< " load and add to its scope.\n"
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<< "\n"
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<< " A path surrounded in < and > will be looked up in the Nix expression search\n"
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<< " path, as in the Nix language itself.\n"
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<< "\n"
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<< " If an element of paths starts with http:// or https://, it is interpreted\n"
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<< " as the URL of a tarball that will be downloaded and unpacked to a temporary\n"
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<< " location. The tarball must include a single top-level directory containing\n"
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<< " at least a file named default.nix.\n";
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}
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string removeWhitespace(string s)
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{
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s = chomp(s);
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size_t n = s.find_first_not_of(" \n\r\t");
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if (n != string::npos) s = string(s, n);
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return s;
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}
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NixRepl::NixRepl(const Strings & searchPath, nix::ref<Store> store)
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: state(searchPath, store)
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, staticEnv(false, &state.staticBaseEnv)
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, historyFile(getDataDir() + "/nix/repl-history")
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{
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curDir = absPath(".");
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}
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NixRepl::~NixRepl()
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{
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linenoiseHistorySave(historyFile.c_str());
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}
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static NixRepl * curRepl; // ugly
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static void completionCallback(const char * s, linenoiseCompletions *lc)
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{
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/* Otherwise, return all symbols that start with the prefix. */
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for (auto & c : curRepl->completePrefix(s))
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linenoiseAddCompletion(lc, c.c_str());
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}
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void NixRepl::mainLoop(const Strings & files)
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{
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string error = ANSI_RED "error:" ANSI_NORMAL " ";
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std::cout << "Welcome to Nix version " << nixVersion << ". Type :? for help." << std::endl << std::endl;
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for (auto & i : files)
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loadedFiles.push_back(i);
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reloadFiles();
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if (!loadedFiles.empty()) std::cout << std::endl;
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createDirs(dirOf(historyFile));
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linenoiseHistorySetMaxLen(1000);
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linenoiseHistoryLoad(historyFile.c_str());
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curRepl = this;
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linenoiseSetCompletionCallback(completionCallback);
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std::string input;
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while (true) {
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// When continuing input from previous lines, don't print a prompt, just align to the same
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// number of chars as the prompt.
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if (!getLine(input, input.empty() ? "nix-repl> " : " "))
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break;
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try {
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if (!removeWhitespace(input).empty() && !processLine(input)) return;
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} catch (ParseError & e) {
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if (e.msg().find("unexpected $end") != std::string::npos) {
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// For parse errors on incomplete input, we continue waiting for the next line of
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// input without clearing the input so far.
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continue;
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} else {
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printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
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}
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} catch (Error & e) {
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printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
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} catch (Interrupted & e) {
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printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
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}
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// We handled the current input fully, so we should clear it
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// and read brand new input.
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linenoiseHistoryAdd(input.c_str());
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input.clear();
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std::cout << std::endl;
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}
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}
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bool NixRepl::getLine(string & input, const std::string &prompt)
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{
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char * s = linenoise(prompt.c_str());
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Finally doFree([&]() { linenoiseFree(s); });
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if (!s) return false;
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input += s;
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return true;
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}
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StringSet NixRepl::completePrefix(string prefix)
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{
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StringSet completions;
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size_t start = prefix.find_last_of(" \n\r\t(){}[]");
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std::string prev, cur;
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if (start == std::string::npos) {
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prev = "";
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cur = prefix;
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} else {
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prev = std::string(prefix, 0, start + 1);
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cur = std::string(prefix, start + 1);
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}
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size_t slash, dot;
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if ((slash = cur.rfind('/')) != string::npos) {
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try {
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auto dir = std::string(cur, 0, slash);
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auto prefix2 = std::string(cur, slash + 1);
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for (auto & entry : readDirectory(dir == "" ? "/" : dir)) {
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if (entry.name[0] != '.' && hasPrefix(entry.name, prefix2))
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completions.insert(prev + dir + "/" + entry.name);
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}
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} catch (Error &) {
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}
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} else if ((dot = cur.rfind('.')) == string::npos) {
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/* This is a variable name; look it up in the current scope. */
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StringSet::iterator i = varNames.lower_bound(cur);
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while (i != varNames.end()) {
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if (string(*i, 0, cur.size()) != cur) break;
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completions.insert(prev + *i);
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i++;
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}
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} else {
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try {
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/* This is an expression that should evaluate to an
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attribute set. Evaluate it to get the names of the
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attributes. */
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string expr(cur, 0, dot);
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string cur2 = string(cur, dot + 1);
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Expr * e = parseString(expr);
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Value v;
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e->eval(state, *env, v);
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state.forceAttrs(v);
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for (auto & i : *v.attrs) {
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string name = i.name;
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if (string(name, 0, cur2.size()) != cur2) continue;
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completions.insert(prev + expr + "." + name);
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}
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} catch (ParseError & e) {
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// Quietly ignore parse errors.
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} catch (EvalError & e) {
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// Quietly ignore evaluation errors.
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} catch (UndefinedVarError & e) {
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// Quietly ignore undefined variable errors.
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}
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}
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return completions;
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}
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static int runProgram(const string & program, const Strings & args)
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{
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Strings args2(args);
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args2.push_front(program);
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Pid pid;
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pid = fork();
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if (pid == -1) throw SysError("forking");
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if (pid == 0) {
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restoreAffinity();
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execvp(program.c_str(), stringsToCharPtrs(args2).data());
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_exit(1);
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}
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return pid.wait();
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}
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bool isVarName(const string & s)
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{
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if (s.size() == 0) return false;
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char c = s[0];
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if ((c >= '0' && c <= '9') || c == '-' || c == '\'') return false;
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for (auto & i : s)
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if (!((i >= 'a' && i <= 'z') ||
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(i >= 'A' && i <= 'Z') ||
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(i >= '0' && i <= '9') ||
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i == '_' || i == '-' || i == '\''))
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return false;
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return true;
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}
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Path NixRepl::getDerivationPath(Value & v) {
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auto drvInfo = getDerivation(state, v, false);
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if (!drvInfo)
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throw Error("expression does not evaluate to a derivation, so I can't build it");
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Path drvPath = drvInfo->queryDrvPath();
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if (drvPath == "" || !state.store->isValidPath(drvPath))
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throw Error("expression did not evaluate to a valid derivation");
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return drvPath;
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}
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bool NixRepl::processLine(string line)
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{
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if (line == "") return true;
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string command, arg;
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if (line[0] == ':') {
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size_t p = line.find_first_of(" \n\r\t");
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command = string(line, 0, p);
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if (p != string::npos) arg = removeWhitespace(string(line, p));
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} else {
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arg = line;
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}
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if (command == ":?" || command == ":help") {
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std::cout
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<< "The following commands are available:\n"
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<< "\n"
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<< " <expr> Evaluate and print expression\n"
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<< " <x> = <expr> Bind expression to variable\n"
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<< " :a <expr> Add attributes from resulting set to scope\n"
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<< " :b <expr> Build derivation\n"
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<< " :i <expr> Build derivation, then install result into current profile\n"
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<< " :l <path> Load Nix expression and add it to scope\n"
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<< " :p <expr> Evaluate and print expression recursively\n"
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<< " :q Exit nix-repl\n"
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<< " :r Reload all files\n"
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<< " :s <expr> Build dependencies of derivation, then start nix-shell\n"
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<< " :t <expr> Describe result of evaluation\n"
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<< " :u <expr> Build derivation, then start nix-shell\n";
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}
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else if (command == ":a" || command == ":add") {
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Value v;
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evalString(arg, v);
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addAttrsToScope(v);
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}
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else if (command == ":l" || command == ":load") {
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state.resetFileCache();
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loadFile(arg);
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}
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else if (command == ":r" || command == ":reload") {
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state.resetFileCache();
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reloadFiles();
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}
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else if (command == ":t") {
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Value v;
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evalString(arg, v);
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std::cout << showType(v) << std::endl;
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} else if (command == ":u") {
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Value v, f, result;
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evalString(arg, v);
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evalString("drv: (import <nixpkgs> {}).runCommand \"shell\" { buildInputs = [ drv ]; } \"\"", f);
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state.callFunction(f, v, result, Pos());
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Path drvPath = getDerivationPath(result);
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runProgram(settings.nixBinDir + "/nix-shell", Strings{drvPath});
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}
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else if (command == ":b" || command == ":i" || command == ":s") {
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Value v;
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evalString(arg, v);
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Path drvPath = getDerivationPath(v);
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if (command == ":b") {
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/* We could do the build in this process using buildPaths(),
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but doing it in a child makes it easier to recover from
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problems / SIGINT. */
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if (runProgram(settings.nixBinDir + "/nix-store", Strings{"-r", drvPath}) == 0) {
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Derivation drv = readDerivation(drvPath);
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std::cout << std::endl << "this derivation produced the following outputs:" << std::endl;
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for (auto & i : drv.outputs)
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std::cout << format(" %1% -> %2%") % i.first % i.second.path << std::endl;
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}
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} else if (command == ":i") {
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runProgram(settings.nixBinDir + "/nix-env", Strings{"-i", drvPath});
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} else {
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runProgram(settings.nixBinDir + "/nix-shell", Strings{drvPath});
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}
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}
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else if (command == ":p" || command == ":print") {
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Value v;
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evalString(arg, v);
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printValue(std::cout, v, 1000000000) << std::endl;
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}
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else if (command == ":q" || command == ":quit")
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return false;
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else if (command != "")
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throw Error(format("unknown command ‘%1%’") % command);
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else {
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size_t p = line.find('=');
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string name;
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if (p != string::npos &&
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p < line.size() &&
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line[p + 1] != '=' &&
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isVarName(name = removeWhitespace(string(line, 0, p))))
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{
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Expr * e = parseString(string(line, p + 1));
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Value & v(*state.allocValue());
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v.type = tThunk;
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v.thunk.env = env;
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v.thunk.expr = e;
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addVarToScope(state.symbols.create(name), v);
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} else {
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Value v;
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evalString(line, v);
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printValue(std::cout, v, 1) << std::endl;
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}
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}
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return true;
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}
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void NixRepl::loadFile(const Path & path)
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{
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loadedFiles.remove(path);
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loadedFiles.push_back(path);
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Value v, v2;
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state.evalFile(lookupFileArg(state, path), v);
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Bindings & bindings(*state.allocBindings(0));
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state.autoCallFunction(bindings, v, v2);
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addAttrsToScope(v2);
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}
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void NixRepl::initEnv()
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{
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env = &state.allocEnv(envSize);
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env->up = &state.baseEnv;
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displ = 0;
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staticEnv.vars.clear();
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varNames.clear();
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for (auto & i : state.staticBaseEnv.vars)
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varNames.insert(i.first);
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}
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void NixRepl::reloadFiles()
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{
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initEnv();
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Strings old = loadedFiles;
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loadedFiles.clear();
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bool first = true;
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for (auto & i : old) {
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if (!first) std::cout << std::endl;
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first = false;
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std::cout << format("Loading ‘%1%’...") % i << std::endl;
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loadFile(i);
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}
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}
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void NixRepl::addAttrsToScope(Value & attrs)
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{
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state.forceAttrs(attrs);
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for (auto & i : *attrs.attrs)
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addVarToScope(i.name, *i.value);
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std::cout << format("Added %1% variables.") % attrs.attrs->size() << std::endl;
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}
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void NixRepl::addVarToScope(const Symbol & name, Value & v)
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{
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if (displ >= envSize)
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throw Error("environment full; cannot add more variables");
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staticEnv.vars[name] = displ;
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env->values[displ++] = &v;
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varNames.insert((string) name);
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}
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Expr * NixRepl::parseString(string s)
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{
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Expr * e = state.parseExprFromString(s, curDir, staticEnv);
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return e;
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}
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void NixRepl::evalString(string s, Value & v)
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{
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Expr * e = parseString(s);
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e->eval(state, *env, v);
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state.forceValue(v);
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}
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std::ostream & NixRepl::printValue(std::ostream & str, Value & v, unsigned int maxDepth)
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{
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ValuesSeen seen;
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return printValue(str, v, maxDepth, seen);
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}
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std::ostream & printStringValue(std::ostream & str, const char * string) {
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str << "\"";
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for (const char * i = string; *i; i++)
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if (*i == '\"' || *i == '\\') str << "\\" << *i;
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else if (*i == '\n') str << "\\n";
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else if (*i == '\r') str << "\\r";
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else if (*i == '\t') str << "\\t";
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else str << *i;
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str << "\"";
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return str;
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}
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// 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;
|
||
}
|
||
|
||
struct CmdRepl : StoreCommand
|
||
{
|
||
Strings files;
|
||
|
||
CmdRepl()
|
||
{
|
||
expectArgs("files", &files);
|
||
}
|
||
|
||
std::string name() override { return "repl"; }
|
||
|
||
std::string description() override
|
||
{
|
||
return "start an interactive environment for evaluating Nix expressions";
|
||
}
|
||
|
||
void run(ref<Store> store) override
|
||
{
|
||
// FIXME: pass searchPath
|
||
NixRepl repl({}, openStore());
|
||
repl.mainLoop(files);
|
||
}
|
||
};
|
||
|
||
static RegisterCommand r1(make_ref<CmdRepl>());
|
||
|
||
}
|