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#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <draw.h>
#include <event.h>
enum
{
SEC = 1000, /* ms */
/* battery discharge levels and charging state */
JLOW = 0,
JMED,
JHIG,
JCHR,
NBATTLVL,
/* percentage text colors */
PDIS = 0,
PCHR,
NPERC,
/* color palette */
CBG = 0,
CFG,
CJUICE,
NCOLOR,
Labspace = 2 /* room around the label */
};
Image *juicecolors[NBATTLVL], *textcolors[NPERC], *palette[NCOLOR];
int bfd, nbatt, lvl, ischarging;
char lvlstr[5];
char battfile[] = "/mnt/acpi/battery";
void
juicereflow(double ratio)
{
Point sp;
sp = Pt(screen->r.min.x, screen->r.max.y - Dy(screen->r)*ratio);
draw(screen, Rpt(sp, screen->r.max), palette[CJUICE], nil, ZP);
}
void
label(Point p, char *text)
{
string(screen, p, palette[CFG], ZP, font, text);
}
Image *
rgba(ulong c)
{
Image *i;
i = allocimage(display, Rect(0,0,1,1), screen->chan, 1, c);
if(i == nil)
sysfatal("allocimage: %r");
return i;
}
void
redraw(void)
{
Point p = Pt(((screen->r.min.x+screen->r.max.x)/2)-((font->width*strlen(lvlstr))/2),
screen->r.max.y-(font->height+Labspace));
draw(screen, screen->r, palette[CBG], nil, ZP);
juicereflow(lvl/100.0);
label(p, lvlstr);
}
void
update(void)
{
char buf[256], idbuf[16], *s, *p;
int n;
if((n = pread(bfd, buf, sizeof(buf)-1, 0)) <= 0)
sysfatal("pread: %r");
buf[n] = 0;
s = buf;
nbatt = 0;
lvl = strtol(s, &s, 0);
do{
if(isalpha(*s)){
p = idbuf;
while(isalpha(*s) && p < idbuf + sizeof idbuf - 1)
*p++ = *s++;
*p = 0;
if(strcmp(idbuf, "charging") == 0)
ischarging = 1;
else if(strcmp(idbuf, "discharging") == 0)
ischarging = 0;
}
if(*s == '\n'){
nbatt++;
if(isdigit(*++s))
lvl += strtol(s, &s, 0);
}
}while(*s++);
lvl /= nbatt;
if(ischarging){
palette[CFG] = textcolors[PCHR];
palette[CJUICE] = juicecolors[JCHR];
}else{
palette[CFG] = textcolors[PDIS];
palette[CJUICE] = lvl < 20 ? juicecolors[JLOW]:
lvl < 60 ? juicecolors[JMED]:
juicecolors[JHIG];
}
snprint(lvlstr, sizeof lvlstr, "%d%%", lvl);
}
void
eresized(int new)
{
if(new && getwindow(display, Refnone) < 0)
fprint(2, "can't reattach to window\n");
redraw();
}
void
usage(void)
{
fprint(2, "usage: %s\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
Event e;
int Etimer, key;
ARGBEGIN{
default: usage();
}ARGEND;
if(argc != 0)
usage();
bfd = open(battfile, OREAD);
if(bfd < 0)
sysfatal("open: %r");
if(initdraw(0, 0, "battery") < 0)
sysfatal("initdraw: %r");
juicecolors[JLOW] = rgba(DRed);
juicecolors[JMED] = rgba(DDarkyellow);
juicecolors[JHIG] = rgba(DMedgreen);
juicecolors[JCHR] = rgba(0x0088CCFF);
textcolors[PDIS] = display->black;
textcolors[PCHR] = rgba(DYellow);
palette[CBG] = allocimagemix(display, 0x88FF88FF, DWhite);
palette[CFG] = textcolors[PDIS];
einit(Emouse);
Etimer = etimer(0, 120*SEC);
update();
redraw();
for(;;){
key = event(&e);
if(key == Etimer)
update();
redraw();
}
}
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