cshell/src/cShell.c

#include "cShell.h"

//  command prototypes so handleCommand() works
//  built in commands are prefixed with "cmd_"
void cmd_exit();
void cmd_help();
void cmd_version();
void cmd_cd(char **args, char **cwd, char **trimmedCWD);
void cmd_mkfile(char **args);
void cmd_mkdir(char **args);
void cmd_rmfile(char **args);
void cmd_rmdir(char **args);
void cmd_ls(char **args);
void cmd_mode(char **args);
void printClamShell();
char *trimCWD(char *cwd);
void execute(char **args);
void parseInput(char *input, char **args);
char* getCWD();
void listDirectorys(const char *path);

typedef struct {
    char *name;
    void (*func)(char **, char **, char **); 
} Command;

Command commands[] = {
    {"exit", (void *)cmd_exit},
    {"help", (void *)cmd_help},
    {"version", (void *)cmd_version},
    {"cd", (void *)cmd_cd},
    {"mkfile", (void *)cmd_mkfile},
    {"mkdir", (void *)cmd_mkdir},
    {"rmfile", (void *)cmd_rmfile},
    {"rmdir", (void *)cmd_rmdir},
    {"ls", (void *)cmd_ls},
    {"mode", (void *)cmd_mode},
    {"clamgen", (void *)printClamShell},
    {NULL, NULL}
};

void handleCommand(char **args, char **cwd, char **trimmedCWD) {
    if (args[0] == NULL) {
        return;
    }

    for (int i = 0; commands[i].name != NULL; i++) {
        if (strcmp(args[0], commands[i].name) == 0) {
            commands[i].func(args, cwd, trimmedCWD);
            return;
        }
    }
    execute(args);
}

void cmd_help() {
    printf("Welcome to cShell, my shitty terminal written in C\n\n");
    printClamShell();
    printf(
        "\nBuilt-in commands:\n"
        "\texit\n"
        "\thelp\n"
        "\tversion\n"
        "\tclamgen\n"
        "\tcd <dir name>\n"
        "\tmkdir <dir name>\n"
        "\trmdir <dir name>\n"
        "\tmkfile <file name>\n"
        "\trmfile <file name>\n"
        "\tls <optional: path>\n" 
        "\tmode <-arg>\n"
        "\t\tnormal mode: -n\n"
        "\t\tevil mode: -e\n"
        "\t\thacker mode: -h\n\n"
    );
}

void cmd_exit() {
    exit(0);
}

void cmd_version() {
    printf("cShell version: %f\n", VERSION);
}

void cmd_cd(char **args, char **cwd, char **trimmedCWD) {
    if (args[1] == NULL) {
        fprintf(stderr, "Missing argument for command \"cd\"\n");
    } else {
        if (chdir(args[1]) != 0) {
            perror("chdir failed\n");
        } else {
            free(*cwd);
            *cwd = getCWD();
            *trimmedCWD = trimCWD(*cwd);
        }
    }
}

void cmd_mkfile(char **args) {
    if (args[1] == NULL) {
        fprintf(stderr, "Error, no file name provided.\n");
    } 

    FILE *file = fopen(args[1], "w");
    if (file == NULL) {
        perror("Error making file");
        return;
    }

    printf("File made successfully: %s\n", args[1]);
    fclose(file);
}

void cmd_mkdir(char **args) {
    if (mkdir(args[1], 0777) != 0) {
        perror("Error making directory");
    } else {
        printf("Directory made successfully: %s\n", args[1]);
    }
}

void cmd_rmfile(char **args) {
    if (remove(args[1]) != 0) {
        perror("Error removing file");
    } else {
        printf("File removed successfully: %s\n", args[1]);
    }
}

void cmd_rmdir(char **args) {
    if (rmdir(args[1]) != 0) {
        perror("Error removing directory");
    } else {
        printf("Directory removed successfully: %s\n", args[1]);
    }
}

void cmd_ls(char **args) {
    const char *path = args[1] ? args[1] : ".";
    listDirectorys(path);
}

void cmd_mode(char **args) {
    if (args[1] == NULL) {
        printf("Invalid arguement, type \"help\" for help");
    }

    struct {
        char *flag;
        char *color;
        char *message;
    } modes[] = {
        {"-e", "\033[31m", "Evil mode activated\n"},
        {"-h", "\033[32m", "Hacker mode activated\n"},
        {"-n", "\033[0m", "Normal mode activated\n"},
        {NULL, NULL, NULL}
    };

    for (int i = 0; modes[i].flag != NULL; i++) {
        if(strcmp(modes[i].flag, args[1]) == 0) {
            printf("%s%s\n", modes[i].color, modes[i].message);
            return;
        }
    }

    printf("Invalid arguement, type \"help\" for help\n");
}

void printClamShell() {
    printf("        ████    ██████      \n");
    printf("    ████░░░░████░░░░░░██    \n");
    printf("  ██░░░░░░░░░░░░██░░░░░░██  \n");
    printf("  ██░░░░░░▒▒▒▒░░░░░░░░░░▒▒██\n");
    printf("██░░░░░░▒▒░░░░░░░░░░░░██▒▒██\n");
    printf("██░░░░▒▒░░░░░░░░░░░░░░░░██  \n");
    printf("██░░▒▒░░░░░░░░░░░░▒▒░░░░░░██\n");
    printf("██░░▒▒░░░░░░░░░░░░▒▒░░░░░░██\n");
    printf("  ██░░░░░░░░░░░░▒▒░░░░░░▒▒██\n");
    printf("  ██░░░░░░░░░░▒▒░░░░░░░░██  \n");
    printf("    ██░░░░▒▒▒▒░░░░░░░░▒▒██  \n");
    printf("      ████░░░░░░▒▒▒▒████    \n");
    printf("          ██████████         \n");
}

char *trimCWD(char *cwd) {
    char *lastSlash = strrchr(cwd, '/');
    return lastSlash ? lastSlash + 1 : (char *)cwd;
}

void execute(char **args) {
    pid_t pid = fork();
    if (pid == 0) {
        execvp(args[0], args);  
        perror("execvp failed");  
        exit(EXIT_FAILURE);
    } else if (pid > 0) {  
        wait(NULL);  
    } else {
        perror("fork failed");
    }
}

void parseInput(char *input, char **args) {
    char *token = strtok(input, " ");
    int i = 0;
    while (token != NULL) {
        args[i++] = token;
        token = strtok(NULL, " ");
    }
    args[i] = NULL;
}

char* getCWD() { // current working directory
    char *cwd = (char *)malloc(INPUT_SIZE);

    if (cwd == NULL) {
        perror("Malloc failed");
        return NULL;
    }

    if (getcwd(cwd, 1024) != NULL) {
        return cwd;
    } else {
        perror("Could not get current working directory");
        free(cwd);
        return NULL;
    }
}

void listDirectorys(const char *path) {
    struct dirent *entry;
    DIR *dp = opendir(path);

    if (dp == NULL) {
        perror("Directory read failed");
        return;
    }

    while ((entry = readdir(dp))) {
        //  skips hidden entries
        if (entry->d_name[0] == '.') {
            continue;
        }
        printf("%s\n", entry->d_name);
    }

    closedir(dp);
 }