121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
// *************************
|
|
// Ben's Implemented SHell
|
|
// bish
|
|
// *************************
|
|
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <unistd.h>
|
|
#include <vector>
|
|
#include <sys/wait.h>
|
|
#include <sys/types.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <sstream>
|
|
#include <pwd.h>
|
|
#include <readline/readline.h>
|
|
#include <readline/history.h>
|
|
#include "parse.h"
|
|
#include "util_fns.h"
|
|
using namespace std;
|
|
|
|
int main(int argc, char **argv){
|
|
|
|
signal(SIGINT, ctrlCHandler);
|
|
|
|
stringstream prompt;
|
|
static char* line = (char*)NULL;
|
|
|
|
const char *homedir;
|
|
if ((homedir = getenv("HOME")) == NULL) {
|
|
homedir = getpwuid(getuid())->pw_dir;
|
|
}
|
|
|
|
// set up history
|
|
using_history();
|
|
string histpath = string(homedir) + string("/.bish_history");
|
|
if (read_history(histpath.c_str())) {
|
|
cout << "history file not found. creating `~/.bish_history`." << endl;
|
|
int hist = open(histpath.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IRGRP | S_IROTH);
|
|
close(hist);
|
|
}
|
|
|
|
|
|
int done = 0;
|
|
while (!done) {
|
|
|
|
prompt.str("");
|
|
prompt << "\e[34mbish:\e[92m" << get_current_dir_name() << "\e[34m:$\e[0m ";
|
|
|
|
line = readline(prompt.str().c_str());
|
|
if (line == NULL) break;
|
|
if (strcmp(line, "") == 0) continue;
|
|
if (line && *line) add_history (line);
|
|
|
|
// handle multiple commands w/ semicolon
|
|
vector<string> semicolon_split = split(line, ';');
|
|
for (auto semicolon_iter: semicolon_split) {
|
|
|
|
command *cmd = parse(split(semicolon_iter.c_str()));
|
|
int num_cmds = cmd->cmds.size();
|
|
// debug info
|
|
// print_cmd(cmd);
|
|
|
|
// clear line var cause we already parsed it
|
|
free(line);
|
|
line = (char*)NULL;
|
|
|
|
if (cmd->cmds[0].vargs[0] == "exit") {
|
|
done = 1;
|
|
break;
|
|
}
|
|
|
|
// COMMANDS that do something with the line before fork/exec
|
|
if (cmd->cmds[0].vargs[0] == "!") {
|
|
line = history_get(where_history())->line;
|
|
cout << line << endl;
|
|
cmd = parse(split(line));
|
|
}
|
|
|
|
if (num_cmds > 1) {
|
|
int in = 0, pipefd[2];
|
|
for (int i = 0; i < num_cmds-1; i++) {
|
|
if (pipe(pipefd)) perror("pipe");
|
|
cmd->cmds[i].ispipe = true;
|
|
cmd->cmds[i].infd = in;
|
|
cmd->cmds[i].outfd = pipefd[1];
|
|
expand_and_execute(&cmd->cmds[i]);
|
|
close(pipefd[1]);
|
|
in = pipefd[0];
|
|
}
|
|
if (in != 0) {
|
|
cmd->cmds[num_cmds-1].ispipe = true;
|
|
cmd->cmds[num_cmds-1].infd = in;
|
|
cmd->cmds[num_cmds-1].outfd = 1;
|
|
expand_and_execute(&cmd->cmds[num_cmds-1]);
|
|
}
|
|
}
|
|
else {
|
|
cmd->cmds[0].ispipe = false;
|
|
expand_and_execute(&cmd->cmds[0]);
|
|
}
|
|
|
|
// else if (strcmp(cmd->cmds[0]->args[0], ".") == 0 || strcmp(cmd->cmds[0]->args[0], "source") == 0) {
|
|
// int dotsrcfile = open(cmd->cmds[0]->args[1], O_RDONLY);
|
|
// if (dotsrcfile < 0) {
|
|
// perror("dotsrcfile");
|
|
// continue;
|
|
// }
|
|
// // do the thing to read the files
|
|
// }
|
|
|
|
// reset args array for the next prompt
|
|
delete cmd;
|
|
|
|
} // end ';' split
|
|
} // end main while loop
|
|
cout << endl;
|
|
if (write_history(histpath.c_str())) perror("write_history");
|
|
return 0;
|
|
}
|