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#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200809L
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#include <sys/stat.h>
#ifdef TEST
#include "unit-test.h"
#include <stdbool.h>
#endif
const int EXIT_ERROR = 1;
const int EXIT_USAGE = 2;
int usage(FILE *stream) {
const char *const msg = "Usage: remembering -p PROFILE -c COMMAND\n";
if (fprintf(stream, msg) < 0) {
perror("usage() - fprintf()");
return -1;
}
return 0;
}
static int help(FILE *stream) {
const char *const msg =
"Options:\n"
" -p, PROFILE profile to be used for gathering and storing data\n"
" -c, COMMAND commant to be run, reading from STDIN, writing to STDOUT\n"
" -h, --help show this help\n"
" -V, --version print the version number\n"
"\nSee \"man remembering\" for more information\n";
if (fprintf(stream, msg) < 0) {
perror("help() - fprint()");
return -1;
}
return 0;
}
static int version(FILE *stream) {
const char *const msg = "remembering-" VERSION " " DATE "\n";
if (fprintf(stream, msg) < 0) {
perror("version() - fprintf()");
return -1;
}
return 0;
}
static int missing(FILE *stream, const char *const argument) {
const char *const msg = "Missing option: %s\n";
if (fprintf(stream, msg, argument) < 0) {
perror("missing() - fprintf()");
return -1;
}
return 0;
}
static char *get_profile_file(const char *const profile, FILE *stream) {
char *home = getenv("XDG_DATA_HOME");
if (!home || (strcmp(home, "")) == 0) {
if (!(home = getenv("HOME"))) {
fprintf(stream, "Unable to get $XDG_DATA_HOME or $HOME environment variables\n");
return NULL;
}
const char *const suffix = "/.local/share/remembering";
const size_t home_suffix_size =
strlen(home) +
strlen(suffix) +
sizeof(char);
char *const home_with_suffix = malloc(home_suffix_size);
if (!home_with_suffix) {
perror("get_profile_file() - malloc() - home_with_suffix");
return NULL;
}
strcat(home_with_suffix, home);
strcat(home_with_suffix, suffix);
home = home_with_suffix;
} else {
if (!(home = strdup(home))) {
perror("get_profile_file() - strdup()");
return NULL;
}
}
size_t size =
strlen(home) +
strlen("/") +
strlen(profile) +
sizeof(char);
char *const profile_file = malloc(size);
if (!profile_file) {
perror("get_profile_file() - malloc() - profile_file");
free(home);
return NULL;
}
strcat(profile_file, home);
strcat(profile_file, "/");
strcat(profile_file, profile);
return profile_file;
}
#ifdef TEST
void test_get_profile_file() {
#define EXPECTED_FMT "\nexpected: %s\ngot: %s\n"
FILE *f = fopen("/dev/null", "w");
assert(f);
{
testing("get_profile_file() when $XDG_DATA_HOME is *unset*");
const char *const previous_xdg_data_home = getenv("XDG_DATA_HOME");
unsetenv("XDG_DATA_HOME");
const char *const HOME = getenv("HOME");
const char *const SUFFIX = "/.local/share/remembering/";
const char *const A_PROFILE = "A-PROFILE-NAME";
assert(HOME);
const size_t expected_size =
strlen(HOME) +
strlen(SUFFIX) +
strlen(A_PROFILE) +
sizeof(char);
char *const expected = malloc(expected_size);
assert(expected);
strcat(expected, HOME);
strcat(expected, SUFFIX);
strcat(expected, A_PROFILE);
char *const profile_file = get_profile_file(A_PROFILE, f);
assert(profile_file);
assertf(
strcmp(profile_file, expected) == 0,
EXPECTED_FMT,
expected,
profile_file
);
free(profile_file);
free(expected);
if (previous_xdg_data_home) {
setenv("XDG_DATA_HOME", previous_xdg_data_home, true);
}
test_ok();
}
{
testing("get_profile_file() when $XDG_DATA_HOME is *empty*");
const char *const previous_xdg_data_home = getenv("XDG_DATA_HOME");
setenv("XDG_DATA_HOME", "", true);
const char *const HOME = getenv("HOME");
const char *const SUFFIX = "/.local/share/remembering/";
const char *const A_PROFILE = "ANOTHER-PROFILE-NAME";
assert(HOME);
const size_t expected_size =
strlen(HOME) +
strlen(SUFFIX) +
strlen(A_PROFILE) +
sizeof(char);
char *const expected = malloc(expected_size);
assert(expected);
strcat(expected, HOME);
strcat(expected, SUFFIX);
strcat(expected, A_PROFILE);
char *const profile_file = get_profile_file(A_PROFILE, f);
assert(profile_file);
assertf(
strcmp(profile_file, expected) == 0,
EXPECTED_FMT,
expected,
profile_file
);
free(profile_file);
free(expected);
if (previous_xdg_data_home) {
setenv("XDG_DATA_HOME", previous_xdg_data_home, true);
} else {
unsetenv("XDG_DATA_HOME");
}
test_ok();
}
{
testing("get_profile_file() when $XDG_DATA_HOME is *set*");
const char *const previous_xdg_data_home = getenv("XDG_DATA_HOME");
const char *const XDG_DATA_HOME = "/a/custom/path";
const char *const A_PROFILE = "YET-ANOTHER-PROFILE-NAME";
const char *const EXPECTED = "/a/custom/path/YET-ANOTHER-PROFILE-NAME";
setenv("XDG_DATA_HOME", XDG_DATA_HOME, true);
char *const profile_file = get_profile_file(A_PROFILE, f);
assert(profile_file);
assertf(
strcmp(profile_file, EXPECTED) == 0,
EXPECTED_FMT,
EXPECTED,
profile_file
);
free(profile_file);
if (previous_xdg_data_home) {
setenv("XDG_DATA_HOME", previous_xdg_data_home, true);
} else {
unsetenv("XDG_DATA_HOME");
}
test_ok();
}
{
testing("get_profile_file() when $HOME is *unset*");
const char *const previous_home = getenv("HOME");
const char *const previous_xdg_data_home = getenv("XDG_DATA_HOME");
unsetenv("XDG_DATA_HOME");
unsetenv("HOME");
assert(get_profile_file("ANY-PROFILE", f) == NULL);
setenv("HOME", previous_home, true);
if (previous_xdg_data_home) {
setenv("XDG_DATA_HOME", previous_xdg_data_home, true);
}
test_ok();
}
fclose(f);
}
#endif
static int mkdir_p(const char *const path, mode_t mode) {
struct stat s;
int ret;
if (stat(path, &s) == 0 && S_ISDIR(s.st_mode)) {
printf("ISDIR: %s\n", path);
return 0;
}
char *const path_dup = strdup(path);
if (!path_dup) {
perror("mkdir_p() - strdup()");
return -1;
}
const char *const parent = dirname(path_dup);
if ((ret = mkdir_p(parent, mode))) {
free(path_dup);
return ret;
}
free(path_dup);
return mkdir(path, mode);
}
int main(int argc, char *argv[]) {
#ifdef TEST
test_get_profile_file();
return EXIT_SUCCESS;
#endif
for (int i = 0; i < argc; i++) {
if (strcmp("--", argv[i]) == 0) {
break;
} else if (strcmp("--help", argv[i]) == 0) {
if (usage(stdout)) return EXIT_ERROR;
if (help(stdout)) return EXIT_ERROR;
return EXIT_SUCCESS;
} else if (strcmp("--version", argv[i]) == 0) {
if (version(stdout)) return EXIT_ERROR;
return EXIT_SUCCESS;
}
}
int option;
const char *profile = NULL;
const char *command = NULL;
while ((option = getopt(argc, argv, "p:c:hV")) != -1) {
switch (option) {
case 'p':
profile = optarg;
break;
case 'c':
command = optarg;
break;
case 'h':
if (usage(stdout)) return EXIT_ERROR;
if (help(stdout)) return EXIT_ERROR;
return EXIT_SUCCESS;
case 'V':
if (version(stdout)) return EXIT_ERROR;
return EXIT_SUCCESS;
default:
if (usage(stderr)) return EXIT_ERROR;
return EXIT_USAGE;
}
}
if (!profile) {
if (missing(stderr, "-p PROFILE")) return EXIT_ERROR;
if (usage(stderr)) return EXIT_ERROR;
return EXIT_USAGE;
}
if (!command) {
if (missing(stderr, "-c COMMAND")) return EXIT_ERROR;
if (usage(stderr)) return EXIT_ERROR;
return EXIT_USAGE;
}
// end getopts
int ret = EXIT_SUCCESS;
char *profile_file = NULL;
if (!(profile_file = get_profile_file(profile, stderr))) {
ret = EXIT_ERROR;
goto cleanup;
}
char *profile_file_dup = NULL;
if (!(profile_file_dup = strdup(profile_file))) {
perror("main() - strdup()");
ret = EXIT_ERROR;
goto cleanup;
}
if ((ret = mkdir_p(dirname(profile_file_dup), S_IRWXU | S_IRWXG | S_IRWXO))) {
goto cleanup;
}
printf("profile: %s\ncommand: %s\n", profile, command);
printf("profile_file: %s\n", profile_file);
cleanup:
free(profile_file_dup);
free(profile_file);
return ret;
}
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