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.

1 files changed, 3 insertions, 3 deletions

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