true, false, echo: avoid uu_app().render_version() for smaller binary size

Author: oech3

src/uu/echo/src/echo.rs

@@ -166,7 +166,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             uu_app().print_help()?;
             return Ok(());
         } else if first_arg == "--version" && args.peek().is_none() {
-            write!(stdout(), "{}", uu_app().render_version())?;
+            writeln!(stdout(), "echo {}", uucore::crate_version!())?;
             return Ok(());
         }
 
@@ -186,7 +186,7 @@ pub fn uu_app() -> Command {
     // Note: echo is different from the other utils in that it should **not**
     // have `infer_long_args(true)`, because, for example, `--ver` should be
     // printed as `--ver` and not show the version text.
-    Command::new(uucore::util_name())
+    Command::new("echo")
         // TrailingVarArg specifies the final positional argument is a VarArg
         // and it doesn't attempts the parse any further args.
         // Final argument must have multiple(true) or the usage string equivalent.

src/uu/false/src/false.rs

@@ -16,7 +16,8 @@ pub fn uumain(mut args: impl uucore::Args) -> i32 {
     let error = if flag == "--help" {
         uu_app().print_help()
     } else if flag == "--version" {
-        write!(std::io::stdout(), "{}", uu_app().render_version())
+        // avoid uu_app for smaller binary size
+        writeln!(std::io::stdout(), "false {}", uucore::crate_version!())
     } else {
         return 1;
     };
@@ -30,7 +31,7 @@ pub fn uumain(mut args: impl uucore::Args) -> i32 {
 }
 
 pub fn uu_app() -> Command {
-    Command::new(uucore::util_name())
+    Command::new("false")
         .version(uucore::crate_version!())
         .help_template(uucore::localized_help_template(uucore::util_name()))
         .about(translate!("false-about"))

src/uu/true/src/true.rs

@@ -16,7 +16,8 @@ pub fn uumain(mut args: impl uucore::Args) -> i32 {
     let error = if flag == "--help" {
         uu_app().print_help()
     } else if flag == "--version" {
-        write!(std::io::stdout(), "{}", uu_app().render_version())
+        // avoid uu_app for smaller binary size
+        writeln!(std::io::stdout(), "true {}", uucore::crate_version!())
     } else {
         return 0;
     };
@@ -35,7 +36,7 @@ pub fn uumain(mut args: impl uucore::Args) -> i32 {
 }
 
 pub fn uu_app() -> Command {
-    Command::new(uucore::util_name())
+    Command::new("true")
         .version(uucore::crate_version!())
         .help_template(uucore::localized_help_template(uucore::util_name()))
         .about(translate!("true-about"))