cli: help: Correct the help messages of ValueEnum

Author: KSXGitHub

src/args/quantity.rs

@@ -7,16 +7,19 @@ use clap::ValueEnum;
 pub enum Quantity {
     /// Measure apparent sizes, equivalent to the
     /// [len](std::fs::Metadata::len) method.
-    #[cfg_attr(feature = "cli", clap(name = "len"))]
+    #[cfg_attr(feature = "cli", clap(name = "len", help = "Measure apparent sizes"))]
     ApparentSize,
     /// Measure block sizes, equivalent to the
     /// [blksize](std::os::unix::prelude::MetadataExt::blksize) method (POSIX only).
     #[cfg(unix)]
-    #[cfg_attr(feature = "cli", clap(name = "blksize"))]
+    #[cfg_attr(feature = "cli", clap(name = "blksize", help = "Measure blksize"))]
     BlockSize,
     /// Count numbers of blocks, equivalent to the
     /// [blocks](std::os::unix::prelude::MetadataExt::blocks) method (POSIX only).
     #[cfg(unix)]
-    #[cfg_attr(feature = "cli", clap(name = "blocks"))]
+    #[cfg_attr(
+        feature = "cli",
+        clap(name = "blocks", help = "Count number of blocks")
+    )]
     BlockCount,
 }

src/bytes_format.rs

@@ -17,13 +17,28 @@ use clap::ValueEnum;
 #[cfg_attr(feature = "cli", derive(ValueEnum))]
 pub enum BytesFormat {
     /// Display the value as-is.
-    #[cfg_attr(feature = "cli", clap(name = "plain"))]
+    #[cfg_attr(
+        feature = "cli",
+        clap(name = "plain", help = "Display plain number of bytes without units")
+    )]
     PlainNumber,
     /// Display the value with a unit suffix in [metric scale](formatter::METRIC).
-    #[cfg_attr(feature = "cli", clap(name = "metric"))]
+    #[cfg_attr(
+        feature = "cli",
+        clap(
+            name = "metric",
+            help = "Use metric scale, i.e. 1K = 1000B, 1M = 1000K, and so on",
+        )
+    )]
     MetricUnits,
     /// Display the value with a unit suffix in [binary scale](formatter::BINARY).
-    #[cfg_attr(feature = "cli", clap(name = "binary"))]
+    #[cfg_attr(
+        feature = "cli",
+        clap(
+            name = "binary",
+            help = "Use binary scale, i.e. 1K = 1024B, 1M = 1024K, and so on",
+        )
+    )]
     BinaryUnits,
 }