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here we go!

This commit is contained in:
Ben Harris 2016-11-03 17:59:20 -04:00
parent 5873feb68b
commit 90aa337d31
1 changed files with 22 additions and 28 deletions
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50
bish.cc
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@ -13,12 +13,6 @@
#include <readline/history.h>
using namespace std;
// http://stackoverflow.com/questions/17766550/ctrl-c-interrupt-event-handling-in-linux
// volatile sig_atomic_t flag = 0;
// void ctrl_c_handler(int sig) {
// flag = 1;
// }
// util methods
vector<string> split(const char *str, char c = ' '){
vector<string> result;
@ -44,50 +38,44 @@ char** v_to_cpp(vector<string> vargs) {
int main(int argc, char **argv){
int done = 0;
stringstream prompt;
static char* line = (char*)NULL;
vector<string> path = split(getenv("PATH"), ':');
// build prompt
stringstream prompt;
prompt << "bish:\e[92m" << get_current_dir_name() << " $\e[0m ";
// set up history
using_history();
read_history("~/.bish_history");
if (read_history(".bish_history")) {
printf("history file not found. creating `.bish_history` in current directory.\n");
cout << "(" << system("touch .bish_history") << "):";
}
// register ctrl c handler
// signal(SIGINT, ctrl_c_handler);
while (!done) {
while ("bish") {
prompt.str("");
prompt << "bish:\e[92m" << get_current_dir_name() << " $\e[0m ";
prompt << "\e[34mbish:\e[92m" << get_current_dir_name() << "\e[34m:$\e[0m ";
line = readline(prompt.str().c_str());
if (line == NULL) break;
if (strcmp(line, "") == 0) continue;
if (line && *line) add_history (line);
char **args = v_to_cpp(split(line));
free(line);
line = (char*)NULL;
// handle exit
// http://www.linuxquestions.org/questions/programming-9/making-a-c-shell-775690/
if (strcmp(args[0], "exit") == 0) {
done = 1;
return 0;
// exit(0);
}
if (strcmp(args[0], "exit") == 0) break;
// handle chdir
else if (strcmp(args[0], "cd") == 0) {
if (args[1] == NULL) {
if (chdir("~") < 0) perror("chdir");
if (chdir("/") < 0) perror("chdir");
}
else {
if (chdir(args[1]) < 0) perror("chdir");
}
}
// process the line.
else {
@ -110,21 +98,22 @@ int main(int argc, char **argv){
execv(searchpath.str().c_str(), args);
}
// nothing found here...
printf("that's not a command, bish");
printf("that's not a command, bish\n");
exit(1);
}
// parent waits for kid to die
else {
int status;
pid_t w;
do {
w = waitpid(kidpid, &status, WUNTRACED | WCONTINUED);
if (w == -1) {
perror("waitpid");
exit(EXIT_FAILURE);
exit(1);
}
if (WIFEXITED(status)) {
printf("(%d):", WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
@ -137,11 +126,16 @@ int main(int argc, char **argv){
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
}
}
// reset args array for the next prompt
delete[] args;
}
printf("\n");
write_history("~/.bish_history");
if (write_history(".bish_history")) perror("write_history");
return 0;
}