base32/base64/basenc: add -D flag (uutils#7479)

* base32/base64/basenc: add -D flag

* base32/base64/basenc: add test for -D flag

* update extensions.md

* remove redundant parameters

* merge  into a single category

* Update docs/src/extensions.md

Co-authored-by: Sylvestre Ledru <sylvestre@debian.org>

---------

Co-authored-by: Sylvestre Ledru <sylvestre@debian.org>

Author: TerakomariGandesblood

docs/src/extensions.md

@@ -93,3 +93,7 @@ also provides a `-v`/`--verbose` flag.
 ## `uptime`
 
 Similar to the proc-ps implementation and unlike GNU/Coreutils, `uptime` provides `-s`/`--since` to show since when the system is up.
+
+## `base32/base64/basenc`
+
+Just like on macOS, `base32/base64/basenc` provides `-D` to decode data.

src/uu/base32/src/base_common.rs

@@ -112,6 +112,7 @@ pub fn base_app(about: &'static str, usage: &str) -> Command {
         .arg(
             Arg::new(options::DECODE)
                 .short('d')
+                .visible_short_alias('D')
                 .long(options::DECODE)
                 .help("decode data")
                 .action(ArgAction::SetTrue)

tests/by-util/test_base32.rs

@@ -54,7 +54,7 @@ fn test_base32_encode_file() {
 
 #[test]
 fn test_decode() {
-    for decode_param in ["-d", "--decode", "--dec"] {
+    for decode_param in ["-d", "--decode", "--dec", "-D"] {
         let input = "JBSWY3DPFQQFO33SNRSCC===\n"; // spell-checker:disable-line
         new_ucmd!()
             .arg(decode_param)

tests/by-util/test_base64.rs

@@ -74,7 +74,7 @@ fn test_base64_encode_file() {
 
 #[test]
 fn test_decode() {
-    for decode_param in ["-d", "--decode", "--dec"] {
+    for decode_param in ["-d", "--decode", "--dec", "-D"] {
         let input = "aGVsbG8sIHdvcmxkIQ=="; // spell-checker:disable-line
         new_ucmd!()
             .arg(decode_param)