*.sh: Fix some shellcheck issues

.config/git/zsh-autoload.sh

@@ -6,20 +6,22 @@
 # correct directory.
 
 if [ $# -eq 0 ]; then
-	printf >&2 "Usage: $(basename "$0") <function>\n"
+	printf >&2 "Usage: %s <function>\n" "$(basename "$0")"
 	exit 1
 fi
+name="$1"
+shift
 
 BASE="${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git"
 
 # In git aliases, shell commands are executed from the top-level directory of
 # the repo. GIT_PREFIX contains the original directory relative to the
 # top-level.
-[ -z "$GIT_PREFIX" ] || cd "$GIT_PREFIX"
+[ -z "$GIT_PREFIX" ] || cd "$GIT_PREFIX" || exit
 
 # no need for error handling, the message from sh is descriptive enough
-if [ "${1#git-}" != "$1" ] || [ -e "$BASE/$1" ]; then
-	exec "$BASE/$@"
+if [ "${name#git-}" != "$name" ] || [ -e "$BASE/$name" ]; then
+	exec "$BASE/$name" "$@"
 else
-	exec "$BASE/git-$@"
+	exec "$BASE/git-$name" "$@"
 fi

.config/i3/monitor-setup.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-if [ 1 -lt "$(xrandr -q | grep " connected" | wc -l)" ]; then
+if [ 1 -lt "$(xrandr -q | grep -c " connected")" ]; then
 	# scale second monitor to 3200x1800 and put to the left
 	xrandr --output eDP1 --auto --pos 0x0 --primary \
 	       --output DP1 --auto --scale-from 3200x1800 --pos 3200x0 \

.config/polybar/launch.sh

@@ -15,17 +15,17 @@ module_flags=(
 	[vpn_click_left]="$BASE_DIR/scripts/pub_ipv4.sh &"
 )
 for module in "${!module_flags[@]}"; do
-	export POLYBAR_${module^^}="${module_flags[$module]}"
+	export POLYBAR_"${module^^}=${module_flags[$module]}"
 done
 
 # if there is no running instance
 if ! pgrep -ax polybar >/dev/null 2>&1; then
 	# launch Polybar on every monitor
 	# https://github.com/polybar/polybar/issues/763
-	while read m; do
+	while read -r m; do
 		export MONITOR="${m%%:*}"
 		polybar --reload -c "$BASE_DIR/config" main &
-	done <<<$(polybar --list-monitors)
+	done <<<"$(polybar --list-monitors)"
 
 	echo "Polybar launched..."
 else

.config/polybar/scripts/battery.sh

@@ -9,7 +9,6 @@ low=20
 
 red='%{F#f00}'
 green='%{F#0f0}'
-end='%{F-}'
 
 bat="$(cat /sys/class/power_supply/BAT0/capacity 2>/dev/null)" || exit
 ac="$(cat /sys/class/power_supply/AC/online 2>/dev/null)"
@@ -21,8 +20,8 @@ ramp=(          )
 # display in green when over $full and a charger is connected
 [[ "$bat" -lt "$full" || "$ac" -eq 0 ]] || color="$green"
 
-let "icon_index = $bat / (${#ramp[@]} - 1)"
-[[ $icon_index -lt ${#ramp[@]} ]] || icond_index=10
+icon_index="$((bat / (${#ramp[@]} - 1)))"
+[[ $icon_index -lt ${#ramp[@]} ]] || icon_index=10
 icon="${ramp[$icon_index]}"
 [[ "$ac" -eq 0 ]] || charge=""
 

.config/polybar/scripts/pub_ipv4.sh

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-echo $(curl -s https://ipinfo.io/ip)
+curl -s https://ipinfo.io/ip

.config/rofi/powermenu.sh

@@ -17,7 +17,7 @@ entries=(
 	[reboot]="$controller reboot"
 	[shutdown]="$controller poweroff"
 	[suspend]="$controller suspend"
-	[suspend (scheduled)]="scheduled_suspend"
+	["suspend (scheduled)"]="scheduled_suspend"
 )
 
 declare -a rofi_args

.local/bin/helpers.sh

@@ -9,5 +9,5 @@
 # Usage: die [<MESSAGE>] [<EXIT_CODE>]
 die() {
 	[ -z "$1" ] || >&2 printf "%s: %s\n" "$0" "$1"
-	exit ${2:-1}
+	exit "${2:-1}"
 }