Make battmux into its own program.

Avoids so many exec()s, especially bothersome when using extrace(1).
It's definitely more efficient as well.

sourcecode/battmux/Makefile

@@ -0,0 +1,3 @@
+EXE = battmux
+
+include ../install.mk

sourcecode/battmux/battmux.c

@@ -0,0 +1,44 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+// tmux or term colors
+#define FGCOLOR(c) "#[fg=colour" c "]"
+//#define FGCOLOR(c) "\x1b[38;5;" c "m" // https://en.wikipedia.org/wiki/ANSI_escape_code
+
+#define BATPATH "/sys/class/power_supply/BAT0/"
+
+int main()
+{
+	char s[64];
+	struct timespec t;
+	struct tm tm;
+
+	if (clock_gettime(CLOCK_REALTIME, &t) < 0) return 1;
+	localtime_r(&t.tv_sec, &tm);
+	strftime(s, sizeof s, "%H:%M   %d/%m   %Y", &tm);
+	fputs(" " FGCOLOR("15"), stdout);
+	fputs(s, stdout);
+	fputs(FGCOLOR("0") "   ", stdout);
+
+	int capfd = open(BATPATH "capacity", O_RDONLY);
+	int stafd = open(BATPATH "status", O_RDONLY);
+	if (capfd<0 || stafd<0) return 0;
+
+	if (read(stafd, s, sizeof s) >= 0)
+		if (strstr(s, "Charging"))
+			fputs("+ ", stdout);
+	close(stafd);
+
+	if (read(capfd, s, sizeof s) < 0) return 1;
+	close(capfd);
+	int cap = atoi(s);
+	for (int i = 0; i < 5; i++)
+		if (i <= cap / 20)
+			fputs(FGCOLOR("1") "♥ ", stdout);
+		else
+			fputs(FGCOLOR("8") "♥ ", stdout);
+}

sourcecode/install.sh

@@ -3,7 +3,7 @@
 set -eu
 
 GOINSTALL=
-SSHFS=
+UTILITIES=
 SUBPROJECTS=
 MPV=
 THEMES=
@@ -11,13 +11,13 @@ THEMES=
 while [ $# -gt 0 ]; do
 	case $1 in
 		all) GOINSTALL=1
-			 SSHFS=1
+			 UTILITIES=1
 			 SUBPROJECTS=1
 			 MPV=1
 			 THEMES=1
 			 ;;
 		go) GOINSTALL=1 ;;
-		sshfs) SSHFS=1 ;;
+		utilities) UTILITIES=1 ;;
 		sub) SUBPROJECTS=1 ;;
 		mpv) MPV=1;;
 		theme) THEMES=1;;
@@ -36,8 +36,9 @@ if [ "$GOINSTALL" ]; then
 	go install ./keyboard_layout_switcher
 fi
 
-if [ "$SSHFS" ]; then
+if [ "$UTILITIES" ]; then
 	make install -C sshfs-map
+	make install -C battmux
 fi
 
 if [ "$SUBPROJECTS" ]; then

term-utils/dot-tmux.conf

@@ -37,7 +37,4 @@ set -g window-status-current-format "#[fg=colour15, italics]   #W "
 set -g window-status-format "#[fg=colour8, italics]   #W "
 
 set -g status-left-length 100
-set -g status-left  "#[fg=colour15]#(date +"%H:%M") #[fg=colour8]hrs   "
-set -ag status-left "#[fg=colour15]#(date +"%d/%m")#[fg=colour8] #(date +"%Y")   "
-set -ag status-left "#[fg=colour7]#(battmux -q)#[fg=colour12]   "
-
+set -g status-left  "#(battmux)"