Push some stuff I forgot to push 2 weeks ago
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f01ea8af6d
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170
src/main.cpp
170
src/main.cpp
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@ -10,12 +10,13 @@
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#include <cstring>
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#include <limits.h>
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#include <fstream>
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#include <signal.h>
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using namespace std;
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vector<string> builtInFunctions = {"exit", "cd", "sub"};
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vector<string> functions = {"exit", "cd", "sub", "listsubs", "set", "get", "run"};
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vector<pair<string, vector<string>>> substitutions = {{"ls", {"ls", "--color"}}};
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vector<pair<string, vector<string>>> substitutions;
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void log(string input) {
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cout << input << endl;
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@ -43,9 +44,30 @@ string prompt() {
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return input;
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}
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vector<string> getPath() {
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string pathstr = getenv("PATH");
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if (pathstr == "") {
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log("WARNING! SPACE CANNOT FIND THE PATH! Please ensure your path is set as an environment variable in your Spacefile, or one of Space's parents has set the PATH environment variable. For now, enjoy the default path :)");
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} else {
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vector<string> path;
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string buffer;
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for (int i = 0; i < pathstr.size(); i++) {
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if (pathstr[i] == ':') {
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path.push_back(buffer);
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buffer = "";
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} else {
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buffer += pathstr[i];
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}
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}
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path.push_back(buffer);
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return path;
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}
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return {"/bin", "/usr/bin", "/usr/local/bin"};
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}
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string findExecutable(string executable) {
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for (int i = 0; i < builtInFunctions.size(); i++) {
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if (builtInFunctions[i] == executable) {
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for (int i = 0; i < functions.size(); i++) {
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if (functions[i] == executable) {
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return executable;
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}
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}
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@ -56,7 +78,7 @@ string findExecutable(string executable) {
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return executable;
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}
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string output;
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vector<string> path = {"/bin", "/usr/bin", "/usr/local/bin"};
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vector<string> path = getPath();
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for (int i = 0; i < path.size(); i++) {
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output = path[i] + "/" + executable;
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if (filesystem::exists(output)) {
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@ -139,30 +161,91 @@ vector<string> tokeniseSubstitutions(string input) {
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}
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int runProcess(vector<string> args) {
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pid_t pid = fork();
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if (pid == -1) {
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cerr << "Fork failed!" << endl;
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if (args[0] == "exit") {
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exit(0);
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} else if (args[0] == "cd") {
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if (args.size() == 1) {
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log("cd requires an argument");
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return 1;
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} else {
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filesystem::current_path(args[1]);
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}
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} else if (args[0] == "set") {
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if (args.size() < 3) {
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log("set requires 2 arguments");
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return 1;
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}
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string envStr = (args[1] + "=" + args[2]);
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char* cEnvStr = strdup(envStr.c_str());
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putenv(cEnvStr);
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} else if (args[0] == "get") {
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if (args.size() < 2) {
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log("get requires an argument");
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return 1;
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}
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char* value = getenv(args[1].c_str());
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if (value == nullptr) {
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log("Environment variable " + args[1] + " not found");
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return 1;
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}
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cout << value << endl;
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} else if (args[0] == "sub") {
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if (args.size() < 3) {
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log("substitute requires 2 arguments");
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return 1;
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}
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vector<string> subArgs = tokeniseSubstitutions(args[2]);
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substitutions.push_back({args[1], subArgs});
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} else if (args[0] == "listsubs") {
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log("Substitutions:");
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for (int i = 0; i < substitutions.size(); i++) {
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string substring;
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for (int j = 0; j < substitutions[i].second.size(); j++) {
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substring += substitutions[i].second[j] + " ";
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}
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cout << substitutions[i].first << " -> " << substring << endl;
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}
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} else {
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pid_t pid = fork();
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if (pid == -1) {
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cerr << "Fork failed!" << endl;
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return -1;
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}
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if (pid == 0) {
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vector<char*> cargs;
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cargs.push_back(const_cast<char*>(args[0].c_str()));
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for (int i = 1; i < args.size(); i++) {
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cargs.push_back(const_cast<char*>(args[i].c_str()));
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}
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cargs.push_back(nullptr);
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execvp(args[0].c_str(), cargs.data());
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cerr << "Execution failed with error " << strerror(errno) << endl;
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_exit(1);
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}
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int status;
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waitpid(pid, &status, 0);
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if (WIFEXITED(status)) {
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return WEXITSTATUS(status);
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}
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return -1;
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}
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if (pid == 0) {
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vector<char*> cargs;
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cargs.push_back(const_cast<char*>(args[0].c_str()));
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for (int i = 1; i < args.size(); i++) {
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cargs.push_back(const_cast<char*>(args[i].c_str()));
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return 0;
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}
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void runScript(string script) {
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string scriptLine;
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ifstream scriptFile(script);
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while (getline(scriptFile, scriptLine)) {
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vector<string> tokens = tokenise(scriptLine);
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if (tokens.empty()) continue;
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int returnCode = runProcess(tokens);
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if (returnCode != 0) {
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log("Script error:\nCommand " + tokens[0] + " failed with exit code " + to_string(returnCode));
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}
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cargs.push_back(nullptr);
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execvp(args[0].c_str(), cargs.data());
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cerr << "Execution failed with error " << strerror(errno) << endl;
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_exit(1);
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}
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int status;
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waitpid(pid, &status, 0);
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if (WIFEXITED(status)) {
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return WEXITSTATUS(status);
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}
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return -1;
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scriptFile.close();
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}
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void doStartup() {
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@ -186,7 +269,13 @@ void doStartup() {
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}
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}
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void handler(int signum);
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int main(int argc, char *argv[]) {
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signal(SIGINT, handler);
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if (argc > 1) {
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runScript(argv[2]);
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}
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doStartup();
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bool continueLoop = true;
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while (continueLoop) {
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@ -196,33 +285,6 @@ int main(int argc, char *argv[]) {
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}
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vector<string> tokens = tokenise(input);
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auto path = filesystem::current_path();
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if (tokens[0] == "exit") {
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exit(0);
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} else if (tokens[0] == "cd") {
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if (tokens.size() == 1) {
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log("cd requires an argument");
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} else {
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filesystem::current_path(tokens[1]);
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}
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continue;
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} else if (tokens[0] == "sub") {
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if (tokens.size() < 3) {
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log("substitute requires 2 arguments");
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continue;
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}
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vector<string> args = tokeniseSubstitutions(tokens[2]);
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substitutions.push_back({tokens[1], args});
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continue;
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} else if (tokens[0] == "listsubs") {
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log("Substitutions:");
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for (int i = 0; i < substitutions.size(); i++) {
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string substring;
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for (int j = 0; j < substitutions[i].second.size(); j++) {
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substring += substitutions[i].second[j] + " ";
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}
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cout << substitutions[i].first << " -> " << substring << endl;
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}
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}
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if (tokens.empty()) {
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continue;
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}
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@ -233,3 +295,7 @@ int main(int argc, char *argv[]) {
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}
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return 0;
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}
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void handler(int signum) {
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main(1, nullptr);
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}
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