gen.pl: quote "bare" minuses in the nroff output

Reported-by: Alejandro Colomar
Fixes #6698

1 files changed, 6 insertions, 0 deletions

diff --git a/docs/cmdline-opts/gen.pl b/docs/cmdline-opts/gen.pl
index 4bcedc36d..1fe4a92c9 100755
--- a/docs/cmdline-opts/gen.pl
+++ b/docs/cmdline-opts/gen.pl
@@ -70,6 +70,9 @@ sub printdesc {
                 $d =~ s/--$k([^a-z0-9_-])/$l$1/;
             }
         }
+        # quote "bare" minuses in the output
+        $d =~ s/( |\\fI|^)--/$1\\-\\-/g;
+        $d =~ s/([ -]|\\fI|^)-/$1\\-/g;
         print $d;
     }
 }
@@ -203,6 +206,9 @@ sub single {
         $opt .= " $arg";
     }
 
+    # quote "bare" minuses in opt
+    $opt =~ s/( |^)--/$1\\-\\-/g;
+    $opt =~ s/( |^)-/$1\\-/g;
     if($standalone) {
         print ".TH curl 1 \"30 Nov 2016\" \"curl 7.52.0\" \"curl manual\"\n";
         print ".SH OPTION\n";