bin/: Use explicit "--" separator for assert-arg usages

In order to prevent legitimate cases to fail as errors, such as:

  NUM='-10'
  eval "$(assert-arg "$NUM" '-n NUM')"

To prevent assert-arg(1) from treating "-10" as the options "-1 and -0,
they need to be put after the "--" separator.

This way, all usages of assert-arg(1) that had its first argument as a
variable were adapted, and the usage and examples of assert-arg itself
were updated to encourage this best practice.

22 files changed, 34 insertions, 34 deletions

diff --git a/bin/assert-arg b/bin/assert-arg
index d7bc8f4..3c8990a 100755
--- a/bin/assert-arg
+++ b/bin/assert-arg
@@ -4,7 +4,7 @@ set -eu
 usage() {
 	cat <<-'EOF'
 		Usage:
-		  assert-arg STRING MESSAGE
+		  assert-arg -- STRING MESSAGE
 		  assert-arg -h
 	EOF
 }
@@ -23,7 +23,7 @@ help() {
 
 		  Assert that $1 contains an argument, named FILENAME:
 
-		    $ eval "$(assert-arg "${1:-}" 'FILENAME')"
+		    $ eval "$(assert-arg -- "${1:-}" 'FILENAME')"
 	EOF
 }
 
diff --git a/bin/clamp b/bin/clamp
index a673f72..fab6967 100755
--- a/bin/clamp
+++ b/bin/clamp
@@ -73,9 +73,9 @@ NUMBER="${1:-}"
 MIN="${2:-}"
 MAX="${3:-}"
 
-eval "$(assert-arg "$NUMBER" 'NUMBER')"
-eval "$(assert-arg "$MIN"    'MIN')"
-eval "$(assert-arg "$MAX"    'MAX')"
+eval "$(assert-arg -- "$NUMBER" 'NUMBER')"
+eval "$(assert-arg -- "$MIN"    'MIN')"
+eval "$(assert-arg -- "$MAX"    'MAX')"
 
 
 if [ "$MIN" -gt "$MAX" ]; then
diff --git a/bin/color b/bin/color
index dc610e9..240da87 100755
--- a/bin/color
+++ b/bin/color
@@ -208,8 +208,8 @@ shift $((OPTIND - 1))
 
 TEXT="${1:-}"
 
-eval "$(assert-arg "$COLOR_FN" '-c COLOR')"
-eval "$(assert-arg "$TEXT"     'TEXT')"
+eval "$(assert-arg -- "$COLOR_FN" '-c COLOR')"
+eval "$(assert-arg -- "$TEXT"     'TEXT')"
 
 
 "$COLOR_FN" "$TEXT"
diff --git a/bin/email b/bin/email
index d427770..3e336d2 100755
--- a/bin/email
+++ b/bin/email
@@ -72,8 +72,8 @@ shift $((OPTIND - 1))
 
 ADDRESS="${1:-}"
 
-eval "$(assert-arg "${SUBJECT:-}" '-s SUBJECT')"
-eval "$(assert-arg "$ADDRESS"       'ADDRESS')"
+eval "$(assert-arg -- "${SUBJECT:-}" '-s SUBJECT')"
+eval "$(assert-arg -- "$ADDRESS"       'ADDRESS')"
 
 {
 	cat <<-EOF
diff --git a/bin/forever b/bin/forever
index d4410e5..1ecc2a8 100755
--- a/bin/forever
+++ b/bin/forever
@@ -58,7 +58,7 @@ while getopts 'h' flag; do
 done
 shift $((OPTIND - 1))
 
-eval "$(assert-arg "${1:-}" 'COMMAND')"
+eval "$(assert-arg -- "${1:-}" 'COMMAND')"
 
 
 while true; do
diff --git a/bin/grun b/bin/grun
index 74d8819..e9cfebe 100755
--- a/bin/grun
+++ b/bin/grun
@@ -72,7 +72,7 @@ done
 shift $((OPTIND - 1))
 
 FILENAME="${1:-}"
-eval "$(assert-arg "$FILENAME" 'FILENAME')"
+eval "$(assert-arg -- "$FILENAME" 'FILENAME')"
 shift
 
 if [ "${1:-}" != '--' ]; then
@@ -82,7 +82,7 @@ if [ "${1:-}" != '--' ]; then
 fi
 shift
 
-eval "$(assert-arg "${1:-}" 'COMMAND')"
+eval "$(assert-arg -- "${1:-}" 'COMMAND')"
 
 
 if [ ! -e "$FILENAME" ]; then
diff --git a/bin/lines b/bin/lines
index 2f0bf46..6cda6f0 100755
--- a/bin/lines
+++ b/bin/lines
@@ -76,6 +76,6 @@ else
 	END=$(($2 - START + 1))
 fi
 
-eval "$(assert-arg "$START" 'START')"
+eval "$(assert-arg -- "$START" 'START')"
 
 tail -n +"$START" | head -n "$END"
diff --git a/bin/menu b/bin/menu
index 3fd3095..0851cab 100755
--- a/bin/menu
+++ b/bin/menu
@@ -72,7 +72,7 @@ done
 shift $((OPTIND - 1))
 ACTION="${1:-}"
 
-eval "$(assert-arg "$ACTION" 'ACTION')"
+eval "$(assert-arg -- "$ACTION" 'ACTION')"
 
 
 DATA() {
diff --git a/bin/msg b/bin/msg
index 0f9cced..84d25a7 100755
--- a/bin/msg
+++ b/bin/msg
@@ -124,22 +124,22 @@ fi
 MESSAGE="${1:-}"
 
 if [ "$XMPP" = true ]; then
-	eval "$(assert-arg "$MESSAGE" '-X MESSAGE')"
+	eval "$(assert-arg -- "$MESSAGE" '-X MESSAGE')"
 	xmpp -m "$MESSAGE" eu@euandre.org &
 fi
 if [ "$SOUND" = true ]; then
 	sound &
 fi
 if [ "$SPEAK" = true ]; then
-	eval "$(assert-arg "$MESSAGE" '-S MESSAGE')"
+	eval "$(assert-arg -- "$MESSAGE" '-S MESSAGE')"
 	echo "$MESSAGE" | speak -v pt-BR &
 fi
 if [ "$MAIL" = true ]; then
-	eval "$(assert-arg "$MESSAGE" '-m MESSAGE')"
+	eval "$(assert-arg -- "$MESSAGE" '-m MESSAGE')"
 	echo " " | email -s "$MESSAGE" eu@euandre.org &
 fi
 if [ "$DESKTOP" = true ]; then
-	eval "$(assert-arg "$MESSAGE" '-D MESSAGE')"
+	eval "$(assert-arg -- "$MESSAGE" '-D MESSAGE')"
 	if [ "$OK" = true ]; then
 		notify-send -t 5000             "$MESSAGE" &
 	else
diff --git a/bin/n-times b/bin/n-times
index 4fa8b96..c8d10d8 100755
--- a/bin/n-times
+++ b/bin/n-times
@@ -61,7 +61,7 @@ shift $((OPTIND - 1))
 COUNT="${1:-}"
 shift
 
-eval "$(assert-arg "$COUNT" 'COUNT')"
+eval "$(assert-arg -- "$COUNT" 'COUNT')"
 
 
 while true; do
diff --git a/bin/ootb b/bin/ootb
index 3aa58db..2b98454 100755
--- a/bin/ootb
+++ b/bin/ootb
@@ -93,7 +93,7 @@ shift $((OPTIND - 1))
 
 
 BUILD_DIRECTORY="${1:-}"
-eval "$(assert-arg "$BUILD_DIRECTORY" 'BUILD_DIRECTORY')"
+eval "$(assert-arg -- "$BUILD_DIRECTORY" 'BUILD_DIRECTORY')"
 mkdir -p "$BUILD_DIRECTORY"
 
 
diff --git a/bin/player b/bin/player
index b6e66d7..cea0e21 100755
--- a/bin/player
+++ b/bin/player
@@ -73,7 +73,7 @@ done
 shift $((OPTIND - 1))
 ACTION="${1:-}"
 
-eval "$(assert-arg "$ACTION" 'ACTION')"
+eval "$(assert-arg -- "$ACTION" 'ACTION')"
 
 
 
diff --git a/bin/playlist b/bin/playlist
index bd01d23..8b9271f 100755
--- a/bin/playlist
+++ b/bin/playlist
@@ -67,7 +67,7 @@ done
 shift $((OPTIND - 1))
 ACTION="${1:-}"
 
-eval "$(assert-arg "$ACTION" 'ACTION')"
+eval "$(assert-arg -- "$ACTION" 'ACTION')"
 
 F="$XDG_DATA_HOME"/euandreh/playlist.txt
 
diff --git a/bin/pre b/bin/pre
index 2b32f8f..f588310 100755
--- a/bin/pre
+++ b/bin/pre
@@ -67,7 +67,7 @@ done
 shift $((OPTIND - 1))
 
 PREFIX="${1:-}"
-eval "$(assert-arg "$PREFIX" 'PREFIX')"
+eval "$(assert-arg -- "$PREFIX" 'PREFIX')"
 
 while read -r line; do
 	if [ -z "$COLOR" ]; then
diff --git a/bin/prompt b/bin/prompt
index 247c81a..382588d 100755
--- a/bin/prompt
+++ b/bin/prompt
@@ -64,7 +64,7 @@ done
 shift $((OPTIND - 1))
 
 STRING="${1:-}"
-eval "$(assert-arg "$STRING" 'STRING')"
+eval "$(assert-arg -- "$STRING" 'STRING')"
 
 printf '%s' "$STRING"
 printf ' [Y/n]: '
diff --git a/bin/rfc b/bin/rfc
index 9c71ebc..0860f45 100755
--- a/bin/rfc
+++ b/bin/rfc
@@ -133,7 +133,7 @@ if [ "${UPDATE:-}" = true ]; then
 	exit
 fi
 
-eval "$(assert-arg "$RFC_NUMBER" 'RFC_NUMBER')"
+eval "$(assert-arg -- "$RFC_NUMBER" 'RFC_NUMBER')"
 
 if [ ! -e "$F" ]; then
 	printf 'Given RFC_NUMBER "%s" does not exist at:\n%s\n' \
diff --git a/bin/vcs b/bin/vcs
index 33bae3c..cbb34aa 100755
--- a/bin/vcs
+++ b/bin/vcs
@@ -232,7 +232,7 @@ done
 shift $((OPTIND - 1))
 
 ACTION="${1:-}"
-eval "$(assert-arg "$ACTION" 'ACTION')"
+eval "$(assert-arg -- "$ACTION" 'ACTION')"
 shift
 
 if [ "${1:-}" = '--' ]; then
diff --git a/bin/vm b/bin/vm
index bfd182a..2296f72 100755
--- a/bin/vm
+++ b/bin/vm
@@ -214,7 +214,7 @@ write_ssh_config
 ACTION="${1:-}"
 OS="${2:-}"
 
-eval "$(assert-arg "$ACTION" 'ACTION')"
+eval "$(assert-arg -- "$ACTION" 'ACTION')"
 shift
 
 
@@ -247,7 +247,7 @@ case "$ACTION" in
 		done
 		;;
 	up)
-		eval "$(assert-arg "$OS" 'OS')"
+		eval "$(assert-arg -- "$OS" 'OS')"
 		shift
 		if [ "${1:-}" = '--' ]; then
 			shift
@@ -301,7 +301,7 @@ case "$ACTION" in
 		write_ssh_config
 		;;
 	down)
-		eval "$(assert-arg "$OS" 'OS')"
+		eval "$(assert-arg -- "$OS" 'OS')"
 		shift
 		if [ "${1:-}" = '--' ]; then
 			shift
diff --git a/bin/volume b/bin/volume
index 991fbc7..9056760 100755
--- a/bin/volume
+++ b/bin/volume
@@ -74,7 +74,7 @@ done
 shift $((OPTIND - 1))
 ACTION="${1:-}"
 
-eval "$(assert-arg "$ACTION" 'ACTION')"
+eval "$(assert-arg -- "$ACTION" 'ACTION')"
 
 
 rotate() {
diff --git a/bin/with-email b/bin/with-email
index 7df101a..bd3ef96 100755
--- a/bin/with-email
+++ b/bin/with-email
@@ -69,7 +69,7 @@ while getopts 's:h' flag; do
 done
 shift $((OPTIND - 1))
 
-eval "$(assert-arg "${1:-}" 'COMMAND...')"
+eval "$(assert-arg -- "${1:-}" 'COMMAND...')"
 
 now() {
 	date '+%Y-%m-%dT%H:%M:%S%Z'
diff --git a/bin/without-env b/bin/without-env
index fd9d1e8..57c2d2e 100755
--- a/bin/without-env
+++ b/bin/without-env
@@ -57,8 +57,8 @@ while getopts 'h' flag; do
 done
 shift $((OPTIND - 1))
 
-eval "$(assert-arg "${1:-}" 'ENVVAR')"
-eval "$(assert-arg "${2:-}" 'PATH')"
+eval "$(assert-arg -- "${1:-}" 'ENVVAR')"
+eval "$(assert-arg -- "${2:-}" 'PATH')"
 
 eval "export $1=\"\$(echo \"\$$1\" | sed \"s|\$2:||g\")\""
 shift # drop $1
diff --git a/bin/wms b/bin/wms
index 03b5b05..a2df5bf 100755
--- a/bin/wms
+++ b/bin/wms
@@ -67,7 +67,7 @@ done
 shift $((OPTIND - 1))
 ACTION="${1:-}"
 
-eval "$(assert-arg "$ACTION" 'ACTION')"
+eval "$(assert-arg -- "$ACTION" 'ACTION')"
 
 
 copy_and_notify() {