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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <limits.h>
#include <unistd.h>
/* get insert-before offset of first argument if any, argv end if none, or -1
* if wd already defined */
int get_wd_off(int argc, char *argv[])
{
int i;
for (i = 0; i < argc; i++) {
if (strcmp("--working-directory", argv[i]) == 0)
return -1;
if (argv[i][0] == '-')
break;
}
return i;
}
/* walk through /proc looking for alacritty cmdline */
bool walk_proc(void)
{
struct dirent *de;
DIR *d = opendir("/proc");
FILE *f;
char path[PATH_MAX], cmd[PATH_MAX];
if (d == NULL)
abort();
while ((de = readdir(d)) != NULL) {
path[0] = '\0';
strcat(path, "/proc/");
strcat(path, de->d_name);
strcat(path, "/cmdline");
f = fopen(path, "r");
if (f == NULL)
continue;
fscanf(f, "%s", cmd);
if (strstr(cmd, "alacritty") != NULL) {
fclose(f);
closedir(d);
return true;
}
fclose(f);
}
closedir(d);
return false;
}
int main(int argc, char *argv[])
{
/* two for --working-directory and cwd, two for msg and create-window, one
* for NULL */
char *argvnew[argc + 5];
char wd_arg_str[] = "--working-directory";
char cwd[PATH_MAX];
char alacritty[] = "alacritty";
char *msg_create_window[] = {"msg", "create-window"};
int i;
int wd_off = get_wd_off(argc, argv);
argvnew[0] = alacritty;
/* insert --working-directory cwd if not already extant */
if (wd_off == -1) {
for (i = 1; i < argc; i++) {
argvnew[i] = argv[i];
}
argvnew[i] = NULL;
} else {
getcwd(cwd, sizeof(cwd));
for (i = 1; i < wd_off; i++)
argvnew[i] = argv[i];
argvnew[i] = wd_arg_str;
argvnew[i + 1] = cwd;
i += 2;
for (; i < argc + 2; i++)
argvnew[i] = argv[i - 2];
argvnew[i] = NULL;
}
/* check if alacritty is running and, if so, insert msg create-window */
if ( (argc < 2 || strcmp("msg", argv[1]) != 0) && walk_proc()) {
/* shunt args up two to make room */
for (i = argc + 4; i > 2; i--)
argvnew[i] = argvnew[i - 2];
argvnew[1] = msg_create_window[0];
argvnew[2] = msg_create_window[1];
}
execv("/bin/alacritty", argvnew);
}
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