feat(args): add --quiet flag for not displaying variables after set

systeroid-core/src/config.rs

@@ -24,6 +24,8 @@ pub struct Config {
 /// Sysctl configuration.
 #[derive(Debug)]
 pub struct AppConfig {
+    /// Whether if the quiet mode is enabled.
+    pub quiet: bool,
     /// Whether if the colors are disabled.
     pub no_color: bool,
     /// Whether if the pager is disabled.
@@ -39,6 +41,7 @@ pub struct AppConfig {
 impl Default for AppConfig {
     fn default() -> Self {
         Self {
+            quiet: false,
             no_color: false,
             no_pager: false,
             section_colors: map! {

systeroid-core/src/sysctl/parameter.rs

@@ -144,6 +144,9 @@ impl Parameter {
         let ctl = Ctl::new(&self.name)?;
         let new_value = ctl.set_value_string(new_value)?;
         self.value = new_value;
-        self.display_value(config, output)
+        if !config.quiet {
+            self.display_value(config, output)?;
+        }
+        Ok(())
     }
 }

systeroid/src/args.rs

@@ -19,6 +19,8 @@ For more details see {bin}(8)."#;
 pub struct Args {
     /// Whether if the verbose logging is enabled.
     pub verbose: bool,
+    /// Whether if the quiet mode is enabled.
+    pub quiet: bool,
     /// Path of the Linux kernel documentation.
     pub kernel_docs: Option<PathBuf>,
     /// Display type of the variables.
@@ -52,6 +54,7 @@ impl Args {
             "select setting that match expression",
             "<expression>",
         );
+        opts.optflag("q", "quiet", "do not echo variable set");
         opts.optopt(
             "E",
             "explain",
@@ -112,6 +115,7 @@ impl Args {
             };
             Some(Args {
                 verbose: matches.opt_present("v"),
+                quiet: matches.opt_present("q"),
                 kernel_docs: matches.opt_str("d").map(PathBuf::from),
                 display_type,
                 ignore_errors: matches.opt_present("e"),

systeroid/src/lib.rs

@@ -19,9 +19,10 @@ pub fn run(args: Args) -> Result<()> {
     let mut config = Config::default();
     config.sysctl.verbose = args.verbose;
     config.sysctl.ignore_errors = args.ignore_errors;
-    config.app.display_type = args.display_type;
+    config.app.quiet = args.quiet;
     config.app.no_color = env::var("NO_COLOR").is_ok();
     config.app.no_pager = args.no_pager;
+    config.app.display_type = args.display_type;
     let mut sysctl = Sysctl::init(config.sysctl)?;
     let mut app = App::new(&mut sysctl, &config.app)?;