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someblocks/someblocks.c
2024-01-29 19:24:56 +01:00

219 lines
4.5 KiB
C

#define _POSIX_C_SOURCE 200809L
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<fcntl.h>
#include<errno.h>
#include<signal.h>
#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);
void sighandler(int signum);
int getstatus(char *str, char *last);
void statusloop(void);
void termhandler(int sig);
void pstdout(void);
void psomebar(void);
static void (*writestatus) (void) = psomebar;
#include "blocks.h"
static char statusbar[LENGTH(blocks)][CMDLENGTH] = {0};
static char statusstr[2][STATUSLENGTH];
static int statusContinue = 1;
static char somebarPath[128];
static int somebarFd = -1;
//opens process *cmd and stores output in *output
void getcmd(const Block *block, char *output)
{
FILE *cmdf;
int i;
strcpy(output, block->icon);
cmdf = popen(block->command, "r");
if (!cmdf)
return;
i = strlen(block->icon);
if (fgets(output+i, CMDLENGTH-i-delimLen, cmdf) != (output+i)) {
exit(1);
}
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()
{
struct sigaction sa = {0};
#ifndef __OpenBSD__
/* initialize all real time signals with dummy handler */
sa.sa_handler = dummysighandler;
for (int i = SIGRTMIN; i <= SIGRTMAX; i++)
sigaction(i, &sa, NULL);
#endif
sa.sa_handler = sighandler;
for (unsigned int i = 0; i < LENGTH(blocks); i++) {
if (blocks[i].signal > 0)
sigaction(SIGMINUS+blocks[i].signal, &sa, NULL);
}
}
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
}
void pstdout()
{
if (!getstatus(statusstr[0], statusstr[1]))//Only write out if text has changed.
return;
printf("%s\n",statusstr[0]);
fflush(stdout);
}
void psomebar()
{
if (!getstatus(statusstr[0], statusstr[1]))//Only write out if text has changed.
return;
if (somebarFd < 0) {
somebarFd = open(somebarPath, O_WRONLY|O_CLOEXEC);
if (somebarFd < 0 && errno == ENOENT) {
// assume somebar is not ready yet
sleep(1);
somebarFd = open(somebarPath, O_WRONLY|O_CLOEXEC);
}
if (somebarFd < 0) {
perror("open");
return;
}
}
dprintf(somebarFd, "status %s\n", statusstr[0]);
}
void statusloop()
{
int i;
setupsignals();
i = 0;
getcmds(-1);
while (1) {
getcmds(i++);
writestatus();
if (!statusContinue)
break;
sleep(1);
}
}
#ifndef __OpenBSD__
/* this signal handler should do nothing */
void dummysighandler(int signum)
{
return;
}
#endif
void sighandler(int signum)
{
getsigcmds(signum-SIGPLUS);
writestatus();
}
void termhandler(int sig)
{
statusContinue = 0;
}
void sigpipehandler(int sig)
{
close(somebarFd);
somebarFd = -1;
}
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;
else if (!strcmp("-s",argv[i]))
strcpy(somebarPath, argv[++i]);
}
if (!strlen(somebarPath)) {
strcpy(somebarPath, getenv("XDG_RUNTIME_DIR"));
strcat(somebarPath, "/somebar-0");
}
delimLen = MIN(delimLen, strlen(delim));
delim[delimLen++] = '\0';
signal(SIGTERM, termhandler);
signal(SIGINT, termhandler);
signal(SIGPIPE, sigpipehandler);
statusloop();
return 0;
}