Consistently use -r instead of -f for conditional shell sourcing

dotfiles/shrc

@@ -71,7 +71,7 @@ if command -v calendar >/dev/null && [ -f ~/.calendar/calendar ]; then
 	calendar
 fi
 
-if [ -s ~/.shrc.local ]; then
+if [ -r ~/.shrc.local ]; then
 	. ~/.shrc.local
 fi
 

mblaze/env

@@ -1,5 +1,5 @@
 # mblaze.env
-# Written in 2020 by Lucas
+# Written in 2020,2023 by Lucas
 # CC0 1.0 Universal/Public domain - No rights reserved
 #
 # To the extent possible under law, the author(s) have dedicated all
@@ -45,7 +45,7 @@ MCOLOR_QUOTE=3
 export MCOLOR_SEP MCOLOR_FROM MCOLOR_HEADER MCOLOR_FOOTER MCOLOR_SIG
 export MCOLOR_QQQUOTE MCOLOR_QQUOTE MCOLOR_QUOTE
 
-if [ -f "$MBLAZE/private.env" ]; then
+if [ -r "$MBLAZE/private.env" ]; then
 	. "$MBLAZE/private.env"
 fi
 

xdg-config-dir/herbstluftwm/autostart

@@ -1,6 +1,6 @@
 #!/bin/sh
 # env
-# Written in 2019-2020,2022 by Lucas
+# Written in 2019-2020,2022-2023 by Lucas
 # CC0 1.0 Universal/Public domain - No rights reserved
 #
 # To the extent possible under law, the author(s) have dedicated all
@@ -10,7 +10,7 @@
 # Dedication along with this software. If not, see
 # <http://creativecommons.org/publicdomain/zero/1.0/>.
 
-if [ -f ~/.config/herbstluftwm/theme ]; then
+if [ -r ~/.config/herbstluftwm/theme ]; then
 	. ~/.config/herbstluftwm/theme
 fi
 

xdg-config-dir/herbstluftwm/herbstpanel.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 # env
-# Written in 2019-2020 by Lucas
+# Written in 2019-2020,2023 by Lucas
 # CC0 1.0 Universal/Public domain - No rights reserved
 #
 # To the extent possible under law, the author(s) have dedicated all
@@ -10,7 +10,7 @@
 # Dedication along with this software. If not, see
 # <http://creativecommons.org/publicdomain/zero/1.0/>.
 
-if [ -f ~/.config/herbstluftwm/theme ]; then
+if [ -r ~/.config/herbstluftwm/theme ]; then
 	. ~/.config/herbstluftwm/theme
 fi