helpers.c

#define _GNU_SOURCE
#include "helpers.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <string.h>

void exode_dir()
{
    if (chdir(getenv("HOME")) == -1)
    {
        printf("Couldn't get to the home directory");
        perror("Error");
        exit(EXIT_FAILURE);
    }
    if (mkdir(".exode", S_IRUSR | S_IWUSR | S_IXUSR) == 0 || errno == EEXIST)
    {
        if (chdir(".exode"))
        {    
            printf("Couldn't get to exode's directory");
            perror("Error");
            exit(EXIT_FAILURE);
        }
    }
}

void repo_dir(char* repo)
{
    exode_dir();
    if (chdir(repo) == -1)
    {
        printf("Couldn't get to the repo directory: %s \n", repo);
        perror("Error");
        exit(EXIT_FAILURE);
    }
}

char* absolute_path(const char* filepath)
{
    char* name = NULL;
    char* dirname = NULL;
    /* TODO: Fix the warning about the cast int > char* */
    dirname = get_current_dir_name();
    if (dirname == NULL)
    {
        perror("Error:");
        exit(EXIT_FAILURE);
    }
    if (asprintf(&name, "%s/%s", dirname, filepath) == -1)
    {
        printf("Error: asprintf() returned -1");
        exit(EXIT_FAILURE);
    }
    free(dirname);
    return name;
}

char* destination_path(const char* filepath)
{
    char *name, *home = NULL;
    /* We need to remove the tree root's name from the string, and then we can find the destiantion path */
    home = getenv("HOME");
    if (home == NULL)
    {
        printf("Error: getenv(\"HOME\") returned NULL");
        exit(EXIT_FAILURE);
    }
    /* We don't check the return value of strchr as we know for a certainty that filepath contains at least one '\' */
    if (asprintf(&name, "%s/%s", home, strchr(filepath, '/')+1) == -1)
    {
        printf("Error: asprintf() returned -1");
        exit(EXIT_FAILURE);
    }
    return name;
}

helpers.h

#ifndef HELPERS_H
#define HELPERS_H

void exode_dir(); /* Should be ~/.exode */
void repo_dir(char* repo);

/* These functions return dynamically allocated strings, free them after usage */
char* absolute_path(const char* filepath); 
char* destination_path(const char* filepath);

#endif

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "repository.h"

const char* badsyntax = "Wrong syntax, RTFM";

int main(int argc, char** argv)
{
    if (argc == 1 || argc > 4)
    {
        printf("%s \n", badsyntax);
        return 0;
    }

    if (strcmp(argv[1], "add") == 0 && (argc == 3))
    {
        add_dotfiles_repository(argv[2]);
    }
    else if (strcmp(argv[1], "del") == 0 && (argc == 3))
    {
        rm_dotfiles_repository(argv[2]);
    }
    else if (strcmp(argv[1], "install") == 0 && (argc == 4))
    {
        install_target(argv[2], argv[3]);
    }
    else
    {
        printf("%s \n", badsyntax);
    }
    return 0;
}

nftwcallbacks.c

#ifndef HELPERS_H
#define HELPERS_H

void exode_dir(); /* Should be ~/.exode */
void repo_dir(char* repo);

/* These functions return dynamically allocated strings, free them after usage */
char* absolute_path(const char* filepath); 
char* destination_path(const char* filepath);

#endif

nftwcallbacks.h

#ifndef HELPERS_H
#define HELPERS_H

void exode_dir(); /* Should be ~/.exode */
void repo_dir(char* repo);

/* These functions return dynamically allocated strings, free them after usage */
char* absolute_path(const char* filepath); 
char* destination_path(const char* filepath);

#endif

repository.c

#define _XOPEN_SOURCE 500
#define _GNU_SOURCE
#include "repository.h"
#include "helpers.h"
#include "nftwcallbacks.h"

#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <error.h>

void add_dotfiles_repository(char* url)
{
    exode_dir();
    char* args[] = {"git", "clone", url, NULL};
    execvp(args[0], args);
}

void rm_dotfiles_repository(char* repo)
{
    repo_dir(repo);
    /* Remove the repository's files recursively
     * TODO: Remove the symbolic links in ~ before removing the repo
     * We remove the repository, target by target */
    DIR* dir = NULL;
    struct dirent* file = NULL;
    struct stat stat_data;
    dir = opendir(".");
    if (dir == NULL)
    {
        perror("Error:");
        exit(EXIT_FAILURE);
    }
    file = readdir(dir);
    while ((file = readdir(dir)) != NULL)
    {
        if (strcmp(file->d_name, ".") != 0 && strcmp(file->d_name, "..") != 0)
        {
            /* TODO: why isn't .git listed, even if .gitmodules is listed ? After tests, it seems that .something repositories which are non-empty 
             * aren't listed*/
            if(stat(file->d_name, &stat_data))
            {
                perror("Error");
                exit(EXIT_FAILURE);
            }
            if (S_ISDIR(stat_data.st_mode))
            {
                remove_target(repo, file->d_name);
            }
            else
            {
                printf("Remove file %s\n", file->d_name);
            }
        }
    }
    if (closedir(dir))
    {
        perror("Error:");
        exit(EXIT_FAILURE);
    }
}

void install_target(char* repo, char* target)
{
    repo_dir(repo);
    if (nftw(target, install, 4, 0))
    {
        exit(EXIT_FAILURE);
    }
}

void remove_target(char* repo, char* target)
{
    printf("Remove target %s from repo %s\n", target, repo);
}

repository.h

#define _XOPEN_SOURCE 500
#define _GNU_SOURCE
#include "repository.h"
#include "helpers.h"
#include "nftwcallbacks.h"

#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <error.h>

void add_dotfiles_repository(char* url)
{
    exode_dir();
    char* args[] = {"git", "clone", url, NULL};
    execvp(args[0], args);
}

void rm_dotfiles_repository(char* repo)
{
    repo_dir(repo);
    /* Remove the repository's files recursively
     * TODO: Remove the symbolic links in ~ before removing the repo
     * We remove the repository, target by target */
    DIR* dir = NULL;
    struct dirent* file = NULL;
    struct stat stat_data;
    dir = opendir(".");
    if (dir == NULL)
    {
        perror("Error:");
        exit(EXIT_FAILURE);
    }
    file = readdir(dir);
    while ((file = readdir(dir)) != NULL)
    {
        if (strcmp(file->d_name, ".") != 0 && strcmp(file->d_name, "..") != 0)
        {
            /* TODO: why isn't .git listed, even if .gitmodules is listed ? After tests, it seems that .something repositories which are non-empty 
             * aren't listed*/
            if(stat(file->d_name, &stat_data))
            {
                perror("Error");
                exit(EXIT_FAILURE);
            }
            if (S_ISDIR(stat_data.st_mode))
            {
                remove_target(repo, file->d_name);
            }
            else
            {
                printf("Remove file %s\n", file->d_name);
            }
        }
    }
    if (closedir(dir))
    {
        perror("Error:");
        exit(EXIT_FAILURE);
    }
}

void install_target(char* repo, char* target)
{
    repo_dir(repo);
    if (nftw(target, install, 4, 0))
    {
        exit(EXIT_FAILURE);
    }
}

void remove_target(char* repo, char* target)
{
    printf("Remove target %s from repo %s\n", target, repo);
}