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/*
* runfile - rf
*
* a no-dependancy, minimal
* POSIX C99 Make/justfile
* alternative to run commands.
*
* czjstmax
* <jstmaxlol at
* disroot dot org>
*
* check MAINTAINERS file
*/
#define _POSIX_C_SOURCE 200809L
#define RUNFILE_VER_MAJ 1
#define RUNFILE_VER_MIN 2
#define RUNFILE_VER_FIX 5
/*
*> rfile version system
* VER_MAX : anything that changes how rfile are written in the slightest
* between 0 and 999
* VER_MIN : anything that varies the UX of the program (i.e. CLI flags)
* between 0 and 999
* VER_FIX : optimizations, slight logic tweaks, anything that is not
* noticeable by the user but impacts the dev experience enough
* to be important. between 0 and 9999
*/
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <wordexp.h>
#include <sys/wait.h>
#define MAX_VARS 128
typedef struct {
char *key;
char *val;
} var_t;
var_t vars[MAX_VARS];
size_t var_count = 0;
void usage();
void printBox(char *str);
char *expand_vars(char *input);
int main(int argc, char **argv)
{
char *section = NULL;
bool in_section = false;
if (argc >= 2) {
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
usage();
return 0;
}
}
}
FILE *f = fopen("rfile", "r");
if (!f) {
fprintf(stderr, "no rfile found.\n");
return 1;
}
wordexp_t p;
char *line = NULL;
size_t len = 0;
while (getline(&line, &len, f) != -1) {
line[strcspn(line, "\n")] = '\0';
char *cmd = line;
while (isspace(*cmd))
cmd++;
if (*cmd == '\0')
continue;
else if (cmd[0] == '#') /* TODO: strchr() up to # and trim cmd to only skip
the commented-out part to allow in-line comments */
continue;
else if (strcmp(cmd, "}") == 0 || strcmp(line, "}") == 0) {
in_section = false;
free(section);
section = NULL;
continue;
}
if (cmd[0] == '@' && strchr(cmd, '=')) {
char *eq = strchr(cmd, '=');
*eq = '\0';
char *key = cmd + 1; //skip '@'
char *val = eq + 1;
vars[var_count].key = strdup(key);
vars[var_count].val = strdup(val);
var_count++;
continue;
}
char *brace = strchr(cmd, '{');
if (brace) {
*brace = '\0';
size_t l = strlen(cmd);
while (l > 0 && (cmd[l-1] == ' ' || cmd[l-1] == '\t')) {
cmd[l-1] = '\0';
l--;
}
free(section);
section = strdup(cmd);
in_section = true;
continue;
}
bool matches =
(argc == 1 && !in_section)
|| (argc > 1 && section && strcmp(argv[1], section) == 0);
if (!matches)
continue;
if (strncmp(cmd, "@: ", 3) == 0) {
printf("\n%s\n", cmd);
continue;
}
else if (strncmp(cmd, "@:! ", 4) == 0) {
printBox(cmd);
continue;
}
char *expanded = expand_vars(cmd);
printf("$ %s\n", expanded);
if (wordexp(expanded, &p, 0) != 0) {
fprintf(stderr, "wordexp failed\n");
continue;
}
pid_t pid = fork();
if (pid == 0) {
execvp(p.we_wordv[0], p.we_wordv);
perror("failed to run command");
fclose(f);
_exit(1);
}
waitpid(pid, NULL, 0);
wordfree(&p);
}
free(line);
fclose(f);
return 0;
}
void usage()
{
printf(
"runfile usage - version %d.%d.%d\n"
"syn: rf [section]\n"
, RUNFILE_VER_MAJ, RUNFILE_VER_MIN, RUNFILE_VER_FIX
);
}
char *expand_vars(char *input)
{
static char buf[8192];
size_t bi = 0;
for (size_t i = 0; input[i] && bi < sizeof(buf) - 1; i++) {
if (input[i] == '@') {
char name[128] = {0};
size_t ni = 0;
size_t j = i + 1;
while (input[j] &&
!isspace(input[j]) &&
input[j] != '@' &&
ni < sizeof(name) - 1) {
name[ni++] = input[j++];
}
name[ni] = '\0';
const char *replacement = NULL;
for (size_t v = 0; v < var_count; v++) {
if (strcmp(vars[v].key, name) == 0) {
replacement = vars[v].val;
break;
}
}
if (replacement) {
size_t k = 0;
while (replacement[k] && bi < sizeof(buf) - 1)
buf[bi++] = replacement[k++];
}
else {
buf[bi++] = '@';
for (size_t k = 0; name[k]; k++)
buf[bi++] = name[k];
}
i = j - 1;
continue;
}
buf[bi++] = input[i];
}
buf[bi] = '\0';
return buf;
}
void printBox(char *str)
{
printf("┌");
for (size_t i = 0; i < strlen(str) + 2; ++i)
printf("─");
printf("┐\n");
printf("│ %s │\n", str);
printf("└");
for (size_t i = 0; i < strlen(str) + 2; ++i)
printf("─");
printf("┘\n");
}
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