zsh: update

.config/zsh/alias/kconfig.zsh

@@ -1,17 +1,25 @@
 #!/bin/zsh
 
 kconf-set() {
-    local n v
+    [ -n "${1:?}" ] || return 1
 
-    n=$1 v=$2 ; shift 2
-    grep -ElZ "^((CONFIG_)?$n=|# (CONFIG_)?$n is not set)" "$@" \
+    local n=$1 v=$2
+    shift 2
+
+    [ $# -gt 0 ] || return 2
+
+    command grep -ElZ "^((CONFIG_)?$n=|# (CONFIG_)?$n is not set)" "$@" \
     | xargs -0 -r sed -i -E -e "s/^(((CONFIG_)?$n)=.+|# ((CONFIG_)?$n) is not set)\$/\\2\\4=$v/"
 }
 
 kconf-unset() {
-    local n
+    [ -n "${1:?}" ] || return 1
 
-    n=$1 ; shift
-    grep -ElZ "^(CONFIG_)?$n=" "$@" \
+    local n=$1
+    shift
+
+    [ $# -gt 0 ] || return 2
+
+    command grep -ElZ "^(CONFIG_)?$n=" "$@" \
     | xargs -0 -r sed -i -E -e "s/^((CONFIG_)?$n)=.+\$/# \\1 is not set/"
 }