some clarification

battery/battery

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 subprogram="$(command -v "$0")"
-if ! nonzero "$subprogram" && ! test -e "$0"; then
+if ! str isvalue "$subprogram" && ! test -e "$0"; then
 	printf "%s: can't find myself!\n" "$0"
 	exit 70 # sysexits(3) EX_SOFTWARE
 else

battery/batterymonitor

@@ -22,7 +22,7 @@ emit "$(printf "Current level: %d%%" "$current_level")"
 
 while true; do
 	current_level=$(battery)
-	if ! [ $current_level -eq $previous_level ]; then
+	if ! streq $current_level $previous_level; then
 		[ $current_level -lt $previous_level ] \
 			&& emit "$(printf "Discharged: %d%% -> %d%%\n" $previous_level $current_level )" \
 			|| emit "$(printf "   Charged: %d%% -> %d%%\n" $previous_level $current_level )"

pscat/pscat.1

@@ -31,6 +31,8 @@ If either could be ignored the individual exit statuses could simply be printed.
 Pscat's function is redundant to the sh(1) construct
 .RB { utility ; utility ;}
 - this is a feature, not a bug.
+.PP
+pscat [ cat | cat ] will pipe "pscat [ cat" into "cat ]", which is a potentially unexpected result of a command.
 
 .SH COPYRIGHT
 

pscat/pscat.c

@@ -44,11 +44,11 @@ check_arg(char **argv){
 				return 0; /* syntax error */
 			break;
 		default: /* >= INLPAREN */
-			if(SCMPFLAT(*argv, R_PAREN)){
-				--s;
-				terms += s == NORMAL;
-			}else if(SCMPFLAT(*argv, L_PAREN)) /* ineligant */
-				++s;
+			if(argv[0][1] == '\0'){
+				s -= (argv[0][0] == R_PAREN);
+				terms += (argv[0][0] == R_PAREN && s == NORMAL);
+				s += (argv[0][0] == L_PAREN);
+			}
 			break;
 		}