From 07740f93d1fd3cffa62b020d526c3cdc9d895bf3 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Sat, 22 Feb 2020 23:01:22 +0000
Subject: now version controlled.

---
 battery.c | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 mkfile    |   8 +++
 testfile  |   2 +
 3 files changed, 176 insertions(+)
 create mode 100644 battery.c
 create mode 100644 mkfile
 create mode 100644 testfile

diff --git a/battery.c b/battery.c
new file mode 100644
index 0000000..f19d1e8
--- /dev/null
+++ b/battery.c
@@ -0,0 +1,166 @@
+#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();
+	}
+}
diff --git a/mkfile b/mkfile
new file mode 100644
index 0000000..3c45968
--- /dev/null
+++ b/mkfile
@@ -0,0 +1,8 @@
+</$objtype/mkfile
+
+BIN=/$objtype/bin
+TARG=battery
+OFILES=\
+	battery.$O\
+
+</sys/src/cmd/mkone
diff --git a/testfile b/testfile
new file mode 100644
index 0000000..92dafe0
--- /dev/null
+++ b/testfile
@@ -0,0 +1,2 @@
+5 mW 1090 21550 23200 1077 200 mV 10782 11100 00:00:00 unknown
+91 mW 19820 21690 23480 1084 200 mV 12144 11400 02:39:14 discharging
-- 
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