feat(complete): Add DirPath support in bash

clap_complete/src/shells/bash.rs

@@ -170,6 +170,7 @@ fn option_details_for_path(cmd: &Command, path: &str) -> String {
     for o in p.get_opts() {
         let compopt = match o.get_value_hint() {
             ValueHint::FilePath => Some("compopt -o filenames"),
+            ValueHint::DirPath => Some("compopt -o plusdirs"),
             _ => None,
         };
 
@@ -229,6 +230,8 @@ fn vals_for(o: &Arg) -> String {
                 .collect::<Vec<_>>()
                 .join(" ")
         )
+    } else if o.get_value_hint() == ValueHint::DirPath {
+        String::from("") // should be empty to avoid duplicate candidates
     } else if o.get_value_hint() == ValueHint::Other {
         String::from("\"${cur}\"")
     } else {

clap_complete/tests/snapshots/home/static/exhaustive/bash/.bashrc

@@ -567,11 +567,17 @@ _exhaustive() {
                     return 0
                     ;;
                 --dir)
-                    COMPREPLY=($(compgen -f "${cur}"))
+                    COMPREPLY=()
+                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
+                        compopt -o plusdirs
+                    fi
                     return 0
                     ;;
                 -d)
-                    COMPREPLY=($(compgen -f "${cur}"))
+                    COMPREPLY=()
+                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
+                        compopt -o plusdirs
+                    fi
                     return 0
                     ;;
                 --exe)

clap_complete/tests/snapshots/value_hint.bash

@@ -60,11 +60,17 @@ _my-app() {
                     return 0
                     ;;
                 --dir)
-                    COMPREPLY=($(compgen -f "${cur}"))
+                    COMPREPLY=()
+                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
+                        compopt -o plusdirs
+                    fi
                     return 0
                     ;;
                 -d)
-                    COMPREPLY=($(compgen -f "${cur}"))
+                    COMPREPLY=()
+                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
+                        compopt -o plusdirs
+                    fi
                     return 0
                     ;;
                 --exe)

clap_complete/tests/testsuite/bash.rs

@@ -200,8 +200,8 @@ fn complete() {
         );
         let actual = runtime.complete(input.as_str(), &term).unwrap();
         assert!(
-            actual.contains("a_file")
+            !actual.contains("a_file")
-                && actual.contains("b_file")
+                && !actual.contains("b_file")
                 && actual.contains("c_dir")
                 && actual.contains("d_dir"),
             "Actual output:\n{}",