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#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<time.h>
#include<signal.h>
#ifndef NO_X
#include<X11/Xlib.h>
#endif
#ifdef __OpenBSD__
#define SIGPLUS SIGUSR1+1
#define SIGMINUS SIGUSR1-1
#else
#define SIGPLUS SIGRTMIN
#define SIGMINUS SIGRTMIN
#endif
#define LENGTH(X) (sizeof(X) / sizeof (X[0]))
#define CMDLENGTH 50
#define MIN( a, b ) ( ( a < b) ? a : b )
#define STATUSLENGTH (LENGTH(blocks) * CMDLENGTH + 1)
typedef struct {
char* icon;
char* command;
unsigned int interval;
unsigned int signal;
} Block;
#ifndef __OpenBSD__
void dummysighandler(int num);
#endif
void sighandler(int num);
void getcmds(int time);
void getsigcmds(unsigned int signal);
void setupsignals();
void sighandler(int signum);
int getstatus(char *str, char *last);
void statusloop();
void termhandler();
void pstdout();
#ifndef NO_X
void setroot();
static void (*writestatus) () = setroot;
static int setupX();
static Display *dpy;
static int screen;
static Window root;
#else
static void (*writestatus) () = pstdout;
#endif
#include "config.h"
static char statusbar[LENGTH(blocks)][CMDLENGTH] = {0};
static char statusstr[2][STATUSLENGTH];
static int statusContinue = 1;
//opens process *cmd and stores output in *output
void getcmd(const Block *block, char *output)
{
strcpy(output, block->icon);
FILE *cmdf = popen(block->command, "r");
if (!cmdf)
return;
int i = strlen(block->icon);
fgets(output+i, CMDLENGTH-i-delimLen, cmdf);
i = strlen(output);
if (i == 0) {
//return if block and command output are both empty
pclose(cmdf);
return;
}
if (delim[0] != '\0') {
//only chop off newline if one is present at the end
i = output[i-1] == '\n' ? i-1 : i;
strncpy(output+i, delim, delimLen);
}
else
output[i++] = '\0';
pclose(cmdf);
}
void getcmds(int time)
{
const Block* current;
for (unsigned int i = 0; i < LENGTH(blocks); i++) {
current = blocks + i;
if ((current->interval != 0 && time % current->interval == 0) || time == -1)
getcmd(current,statusbar[i]);
}
}
void getsigcmds(unsigned int signal)
{
const Block *current;
for (unsigned int i = 0; i < LENGTH(blocks); i++) {
current = blocks + i;
if (current->signal == signal)
getcmd(current,statusbar[i]);
}
}
void setupsignals()
{
#ifndef __OpenBSD__
/* initialize all real time signals with dummy handler */
for (int i = SIGRTMIN; i <= SIGRTMAX; i++)
signal(i, dummysighandler);
#endif
for (unsigned int i = 0; i < LENGTH(blocks); i++) {
if (blocks[i].signal > 0)
signal(SIGMINUS+blocks[i].signal, sighandler);
}
}
int getstatus(char *str, char *last)
{
strcpy(last, str);
str[0] = '\0';
for (unsigned int i = 0; i < LENGTH(blocks); i++)
strcat(str, statusbar[i]);
str[strlen(str)-strlen(delim)] = '\0';
return strcmp(str, last);//0 if they are the same
}
#ifndef NO_X
void setroot()
{
if (!getstatus(statusstr[0], statusstr[1]))//Only set root if text has changed.
return;
XStoreName(dpy, root, statusstr[0]);
XFlush(dpy);
}
int setupX()
{
dpy = XOpenDisplay(NULL);
if (!dpy) {
fprintf(stderr, "dwmblocks: Failed to open display\n");
return 0;
}
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
return 1;
}
#endif
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()
{
setupsignals();
/* first figure out the default wait interval by finding the
* greatest common denominator of the intervals */
unsigned int interval = -1;
for (int i = 0; i < LENGTH(blocks); i++) {
if(blocks[i].interval) {
int tmp;
int blocks_interval = blocks[i].interval;
while (interval > 0) {
tmp = blocks_interval % interval;
blocks_interval = interval;
interval = tmp;
}
interval = blocks_interval;
}
}
unsigned int i = 0;
int interrupted = 0;
struct timespec sleeptime = {interval, 0};
struct timespec tosleep = sleeptime;
getcmds(-1);
while (statusContinue) {
interrupted = nanosleep(&tosleep, &tosleep);
/* sleep for tosleep (should be a sleeptime of interval seconds) and
* put what was left if interrupted back into tosleep */
if (interrupted == -1)
continue;
/* if not interrupted then do the calling and writing */
getcmds(i);
writestatus();
/* then increment since its actually been a second
* (plus the time it took the commands to run) */
i = i + interval;
tosleep = sleeptime;
}
}
#ifndef __OpenBSD__
/* this signal handler should do nothing */
void dummysighandler(int signum)
{
return;
}
#endif
void sighandler(int signum)
{
getsigcmds(signum-SIGPLUS);
writestatus();
}
void termhandler()
{
statusContinue = 0;
}
int main(int argc, char** argv)
{
for (int i = 0; i < argc; i++) {//Handle command line arguments
if (!strcmp("-d",argv[i]))
strncpy(delim, argv[++i], delimLen);
else if (!strcmp("-p",argv[i]))
writestatus = pstdout;
}
#ifndef NO_X
if (!setupX())
return 1;
#endif
delimLen = MIN(delimLen, strlen(delim));
delim[delimLen++] = '\0';
signal(SIGTERM, termhandler);
signal(SIGINT, termhandler);
statusloop();
#ifndef NO_X
XCloseDisplay(dpy);
#endif
return 0;
}
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