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dwmblocks
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      LICENSE
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LICENSE
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
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Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or your
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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Makefile
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PREFIX ?= /usr/local
output: dwmblocks.o
gcc dwmblocks.o -lX11 -o dwmblocks
dwmblocks.o: dwmblocks.c config.h
gcc -c -lX11 dwmblocks.c
clean:
rm -f *.o *.gch dwmblocks
install: output
mkdir -p $(DESTDIR)$(PREFIX)/bin
cp -f dwmblocks $(DESTDIR)$(PREFIX)/bin
chmod 755 $(DESTDIR)$(PREFIX)/bin/dwmblocks
uninstall:
rm -f $(DESTDIR)$(PREFIX)/bin/dwmblocks

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README.md
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# dwmblocks
Modular status bar for dwm written in c.
This build is based on [lukesmithxyz's](https://github.com/lukesmithxyz) build.
It uses my personal scripts you can find in my [dotfiles](https://github.com/tiyn/.dotfiles) in the `~/.local/bin/tools/statusbar` folder.
# Modifying blocks
The statusbar is made from text output from commandline programs. Blocks are
added and removed by editing the config.h file.
# Signaling changes
Most statusbars constantly rerun every script every several seconds to update.
This is an option here, but a superior choice is giving your module a signal
that you can signal to it to update on a relevant event, rather than having it
rerun idly.
For example, the audio module has the update signal 10 by default. Thus,
running `pkill -RTMIN+10 dwmblocks` will update it.
You can also run `kill -44 $(pidof dwmblocks)` which will have the same effect,
but is faster. Just add 34 to your typical signal number.
My volume module *never* updates on its own, instead I have this command run
along side my volume shortcuts in dwm to only update it when relevant.
Note that if you signal an unexpected signal to dwmblocks, it will probably
crash. So if you disable a module, remember to also disable any cronjobs or
other scripts that might signal to that module.
# Clickable modules
Like i3blocks, this build allows you to build in additional actions into your
scripts in response to click events. See the above linked scripts for examples
of this using the `$BLOCK_BUTTON` variable.
For this feature to work, you need the appropriate patch in dwm as well. See
[here](https://dwm.suckless.org/patches/statuscmd/).
Credit for those patches goes to Daniel Bylinka (daniel.bylinka@gmail.com).

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//Modify this file to change what commands output to your statusbar, and recompile using the make command.
static const Block blocks[] = {
/*Icon*/ /*Command*/ /*Update Interval*/ /*Update Signal*/
{"", "memory", 10, 6},
{"", "cpu", 10, 5},
{"", "disk /", 1800, 7},
{"", "volume", 0, 4},
{"", "battery BAT0", 5, 2},
{"", "internet", 5, 3},
{"", "clock", 60, 1},
};
//sets delimeter between status commands. NULL character ('\0') means no delimeter.
static char delim = ' ';
// Have dwmblocks automatically recompile and run when you edit this file in
// vim with the following line in your vimrc/init.vim:
// autocmd BufWritePost ~/.local/src/dwmblocks/config.h !cd ~/.local/src/dwmblocks/; sudo make install && { killall -q dwmblocks;setsid dwmblocks & }

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dwmblocks.c
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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) {
read++;
*write = *read;
}
read++;
write++;
}
}
//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-i, cmdf);
remove_all(output, '\n');
i = strlen(output);
if (delim != '\0' && i)
output[i++] = 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 = 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);
signal(SIGCHLD, SIG_IGN);
}
#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]);
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'};
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 *command[] = { "/bin/sh", "-c", current->command, NULL };
setenv("BLOCK_BUTTON", button, 1);
setsid();
execvp(command[0], command);
exit(EXIT_SUCCESS);
}
getsigcmds(sig);
writestatus();
}
#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][0];
else if(!strcmp("-p",argv[i]))
writestatus = pstdout;
}
signal(SIGTERM, termhandler);
signal(SIGINT, termhandler);
statusloop();
}

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