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#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<signal.h>
#include<X11/Xlib.h>
#define LENGTH(X) (sizeof(X) / sizeof (X[0]))
#define CMDLENGTH 50
typedef struct {
char* icon;
char* command;
unsigned int interval;
unsigned int signal;
} Block;
void sighandler(int num);
void buttonhandler(int sig, siginfo_t *si, void *ucontext);
void replace(char *str, char old, char new);
void remove_all(char *str, char to_remove);
void getcmds(int time);
#ifndef __OpenBSD__
void getsigcmds(int signal);
void setupsignals();
void sighandler(int signum);
#endif
int getstatus(char *str, char *last);
void setroot();
void statusloop();
void termhandler(int signum);
#include "config.h"
static Display *dpy;
static int screen;
static Window root;
static char statusbar[LENGTH(blocks)][CMDLENGTH] = {0};
static char statusstr[2][256];
static int statusContinue = 1;
static void (*writestatus) () = setroot;
void replace(char *str, char old, char new)
{
int N = strlen(str);
for(int i = 0; i < N; i++)
if(str[i] == old)
str[i] = new;
}
void remove_all(char *str, char to_remove) {
char *read = str;
char *write = str;
while (*read) {
if (*read != to_remove) {
*write = *read;
++write;
}
++read;
}
*write = '\0';
}
//opens process *cmd and stores output in *output
void getcmd(const Block *block, char *output)
{
if (block->signal)
{
output[0] = block->signal;
output++;
}
strcpy(output, block->icon);
char *cmd = block->command;
FILE *cmdf = popen(cmd,"r");
if (!cmdf)
return;
char c;
int i = strlen(block->icon);
fgets(output+i, CMDLENGTH-(strlen(delim)+1), cmdf);
remove_all(output, '\n');
i = strlen(output);
if ((i > 0 && block != &blocks[LENGTH(blocks) - 1]))
strcat(output, delim);
i+=strlen(delim);
output[i++] = '\0';
pclose(cmdf);
}
void getcmds(int time)
{
const Block* current;
for(int i = 0; i < LENGTH(blocks); i++)
{
current = blocks + i;
if ((current->interval != 0 && time % current->interval == 0) || time == -1)
getcmd(current,statusbar[i]);
}
}
#ifndef __OpenBSD__
void getsigcmds(int signal)
{
const Block *current;
for (int i = 0; i < LENGTH(blocks); i++)
{
current = blocks + i;
if (current->signal == signal)
getcmd(current,statusbar[i]);
}
}
void setupsignals()
{
struct sigaction sa;
for(int i = SIGRTMIN; i <= SIGRTMAX; i++)
signal(i, SIG_IGN);
for(int i = 0; i < LENGTH(blocks); i++)
{
if (blocks[i].signal > 0)
{
signal(SIGRTMIN+blocks[i].signal, sighandler);
sigaddset(&sa.sa_mask, SIGRTMIN+blocks[i].signal);
}
}
sa.sa_sigaction = buttonhandler;
sa.sa_flags = SA_SIGINFO;
sigaction(SIGUSR1, &sa, NULL);
struct sigaction sigchld_action = {
.sa_handler = SIG_DFL,
.sa_flags = SA_NOCLDWAIT
};
sigaction(SIGCHLD, &sigchld_action, NULL);
}
#endif
int getstatus(char *str, char *last)
{
strcpy(last, str);
str[0] = '\0';
for(int i = 0; i < LENGTH(blocks); i++) {
strcat(str, statusbar[i]);
if (i == LENGTH(blocks) - 1)
strcat(str, " ");
}
str[strlen(str)-1] = '\0';
return strcmp(str, last);//0 if they are the same
}
void setroot()
{
if (!getstatus(statusstr[0], statusstr[1]))//Only set root if text has changed.
return;
Display *d = XOpenDisplay(NULL);
if (d) {
dpy = d;
}
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
XStoreName(dpy, root, statusstr[0]);
XCloseDisplay(dpy);
}
void pstdout()
{
if (!getstatus(statusstr[0], statusstr[1]))//Only write out if text has changed.
return;
printf("%s\n",statusstr[0]);
fflush(stdout);
}
void statusloop()
{
#ifndef __OpenBSD__
setupsignals();
#endif
int i = 0;
getcmds(-1);
while(statusContinue)
{
getcmds(i);
writestatus();
sleep(1.0);
i++;
}
}
#ifndef __OpenBSD__
void sighandler(int signum)
{
getsigcmds(signum-SIGRTMIN);
writestatus();
}
void buttonhandler(int sig, siginfo_t *si, void *ucontext)
{
char button[2] = {'0' + si->si_value.sival_int & 0xff, '\0'};
pid_t process_id = getpid();
sig = si->si_value.sival_int >> 8;
if (fork() == 0)
{
const Block *current;
for (int i = 0; i < LENGTH(blocks); i++)
{
current = blocks + i;
if (current->signal == sig)
break;
}
char shcmd[1024];
sprintf(shcmd,"%s && kill -%d %d",current->command, current->signal+34,process_id);
char *command[] = { "/bin/sh", "-c", shcmd, NULL };
setenv("BLOCK_BUTTON", button, 1);
setsid();
execvp(command[0], command);
exit(EXIT_SUCCESS);
}
}
#endif
void termhandler(int signum)
{
statusContinue = 0;
exit(0);
}
int main(int argc, char** argv)
{
for(int i = 0; i < argc; i++)
{
if (!strcmp("-d",argv[i]))
delim = argv[++i];
else if(!strcmp("-p",argv[i]))
writestatus = pstdout;
}
signal(SIGTERM, termhandler);
signal(SIGINT, termhandler);
statusloop();
}
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