fix(help): Display value terminator and delimiter

Closes #5392 and #4812, related to #1052

Author: Aethelflaed

clap_builder/src/builder/arg.rs

@@ -4647,6 +4647,7 @@ impl Arg {
             val_names = vec![val_name; min];
         }
 
+        let delimiter = self.get_value_delimiter().unwrap_or(' ');
         debug_assert!(self.is_takes_value_set());
         for (n, val_name) in val_names.iter().enumerate() {
             let arg_name = if self.is_positional() && (num_vals.min_values() == 0 || !required) {
@@ -4656,7 +4657,7 @@ impl Arg {
             };
 
             if n != 0 {
-                rendered.push(' ');
+                rendered.push(delimiter);
             }
             rendered.push_str(&arg_name);
         }
@@ -4670,6 +4671,11 @@ impl Arg {
             rendered.push_str("...");
         }
 
+        if let Some(terminator) = self.get_value_terminator() {
+            rendered.push(' ');
+            rendered.push_str(terminator);
+        }
+
         rendered
     }
 

clap_builder/src/output/help_template.rs

@@ -766,6 +766,13 @@ impl<'cmd, 'writer> HelpTemplate<'cmd, 'writer> {
                 a.default_vals
             );
 
+            // We might need up to 4 bytes to encode an utf-8 character
+            let mut buffer = [0u8; 4];
+            let delimiter = a
+                .get_value_delimiter()
+                .unwrap_or(' ')
+                .encode_utf8(&mut buffer);
+
             let pvs = a
                 .default_vals
                 .iter()
@@ -778,11 +785,21 @@ impl<'cmd, 'writer> HelpTemplate<'cmd, 'writer> {
                     }
                 })
                 .collect::<Vec<_>>()
-                .join(" ");
+                .join(delimiter);
 
             spec_vals.push(format!("[default: {pvs}]"));
         }
 
+        if let Some(delimiter) = a.get_value_delimiter() {
+            debug!("HelpTemplate::spec_vals: Found delimiter...{delimiter:?}");
+            spec_vals.push(format!("[value delimiter: {delimiter:?}]"));
+        }
+
+        if let Some(terminator) = a.get_value_terminator() {
+            debug!("HelpTemplate::spec_vals: Found terminator...{terminator:?}");
+            spec_vals.push(format!("[value terminator: {terminator:?}]"));
+        }
+
         let als = a
             .aliases
             .iter()

tests/builder/help.rs

@@ -2053,10 +2053,10 @@ fn issue_1052_require_delim_help() {
     let expected = str![[r#"
 tests stuff
 
-Usage: test --fake <some> <val>
+Usage: test --fake <some>:<val>
 
 Options:
-  -f, --fake <some> <val>  some help
+  -f, --fake <some>:<val>  some help [value delimiter: ':']
   -h, --help               Print help
   -V, --version            Print version
 
@@ -2082,11 +2082,11 @@ fn display_value_terminator() {
     let expected = str![[r#"
 Likes seeing the value terminator
 
-Usage: test --cmd <cmd>...
+Usage: test --cmd <cmd>... ;
 
 Options:
-      --cmd <cmd>...  command to run
-  -h, --help          Print help
+      --cmd <cmd>... ;  command to run [value terminator: ";"]
+  -h, --help            Print help
 
 "#]];
     utils::assert_output(cmd, "test --help", expected, false);
@@ -2118,10 +2118,10 @@ fn custom_headers_headers() {
     let expected = str![[r#"
 does stuff
 
-Usage: test [OPTIONS] --fake <some> <val>
+Usage: test [OPTIONS] --fake <some>:<val>
 
 Options:
-  -f, --fake <some> <val>  some help
+  -f, --fake <some>:<val>  some help [value delimiter: ':']
   -h, --help               Print help
   -V, --version            Print version
 
@@ -2189,10 +2189,10 @@ fn multiple_custom_help_headers() {
     let expected = str![[r#"
 does stuff
 
-Usage: test [OPTIONS] --fake <some> <val> --birthday-song <song> --birthday-song-volume <volume>
+Usage: test [OPTIONS] --fake <some>:<val> --birthday-song <song> --birthday-song-volume <volume>
 
 Options:
-  -f, --fake <some> <val>  some help
+  -f, --fake <some>:<val>  some help [value delimiter: ':']
       --style <style>      Choose musical style to play the song
   -s, --speed <SPEED>      How fast? [possible values: fast, slow]
   -h, --help               Print help