fix missing -m flag

Author: STRTSNM

src/uu/df/locales/en-US.ftl

@@ -17,6 +17,7 @@ df-help-total = produce a grand total
 df-help-human-readable = print sizes in human readable format (e.g., 1K 234M 2G)
 df-help-si = likewise, but use powers of 1000 not 1024
 df-help-inodes = list inode information instead of block usage
+df-help-mega = like --block-size=1M
 df-help-kilo = like --block-size=1K
 df-help-local = limit listing to local file systems
 df-help-no-sync = do not invoke sync before getting usage info (default)

src/uu/df/src/blocks.rs

@@ -176,17 +176,22 @@ pub(crate) fn read_block_size(matches: &ArgMatches) -> Result<BlockSize, ParseSi
         } else {
             Err(ParseSizeError::ParseFailure(format!("{}", s.quote())))
         }
+    } else if matches.get_flag("mega") {
+        Ok(BlockSize::Bytes(1024 * 1024))
+    } else if matches.get_flag("kilo") {
+        Ok(BlockSize::Bytes(1024))
     } else if matches.get_flag(OPT_PORTABILITY) {
         Ok(BlockSize::default())
     } else if let Some(bytes) =
         parse_block_size::block_size_from_env(&["DF_BLOCK_SIZE", "BLOCK_SIZE", "BLOCKSIZE"]).found()
     {
-        Ok(BlockSize::Bytes(bytes))
+        Ok(BlockSize::Bytes(bytes)) 
     } else {
         Ok(BlockSize::default())
     }
 }
 
+
 impl fmt::Display for BlockSize {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {

src/uu/df/src/df.rs

@@ -38,6 +38,7 @@ static OPT_TOTAL: &str = "total";
 static OPT_HUMAN_READABLE_BINARY: &str = "human-readable-binary";
 static OPT_HUMAN_READABLE_DECIMAL: &str = "human-readable-decimal";
 static OPT_INODES: &str = "inodes";
+static OPT_MEGA: &str = "mega";
 static OPT_KILO: &str = "kilo";
 static OPT_LOCAL: &str = "local";
 static OPT_NO_SYNC: &str = "no-sync";
@@ -517,7 +518,7 @@ pub fn uu_app() -> Command {
                 .short('B')
                 .long("block-size")
                 .value_name("SIZE")
-                .overrides_with_all([OPT_KILO, OPT_BLOCKSIZE])
+                .overrides_with_all([OPT_KILO, OPT_BLOCKSIZE, OPT_MEGA])
                 .help(translate!("df-help-block-size")),
         )
         .arg(
@@ -551,11 +552,18 @@ pub fn uu_app() -> Command {
                 .help(translate!("df-help-inodes"))
                 .action(ArgAction::SetTrue),
         )
+        .arg(
+            Arg::new(OPT_MEGA)
+                .short('m')
+                .help(translate!("df-help-mega"))
+                .overrides_with_all([OPT_BLOCKSIZE, OPT_KILO, OPT_MEGA])
+                .action(ArgAction::SetTrue),
+        )
         .arg(
             Arg::new(OPT_KILO)
                 .short('k')
                 .help(translate!("df-help-kilo"))
-                .overrides_with_all([OPT_BLOCKSIZE, OPT_KILO])
+                .overrides_with_all([OPT_BLOCKSIZE, OPT_KILO, OPT_MEGA])
                 .action(ArgAction::SetTrue),
         )
         .arg(