feat(args): add --no-pager flag for disabling the pager

systeroid-core/src/config.rs

@@ -21,18 +21,13 @@ pub struct Config {
     pub sysctl: SysctlConfig,
 }
 
-/// Sysctl configuration.
-#[derive(Debug, Default)]
-pub struct SysctlConfig {
-    /// Whether if the errors should be ignored.
-    pub ignore_errors: bool,
-}
-
 /// Sysctl configuration.
 #[derive(Debug)]
 pub struct AppConfig {
     /// Whether if the colors are disabled.
     pub no_color: bool,
+    /// Whether if the pager is disabled.
+    pub no_pager: bool,
     /// Sections and the corresponding colors.
     pub section_colors: HashMap<Section, Color>,
     /// Default color for the output
@@ -45,6 +40,7 @@ impl Default for AppConfig {
     fn default() -> Self {
         Self {
             no_color: false,
+            no_pager: false,
             section_colors: map! {
                 Section::Abi => Color::Red,
                 Section::Fs => Color::Green,
@@ -60,3 +56,9 @@ impl Default for AppConfig {
         }
     }
 }
+/// Sysctl configuration.
+#[derive(Debug, Default)]
+pub struct SysctlConfig {
+    /// Whether if the errors should be ignored.
+    pub ignore_errors: bool,
+}

systeroid/src/app.rs

@@ -72,6 +72,10 @@ impl<'a> App<'a> {
     pub fn display_documentation(&mut self, param_name: &str) -> Result<()> {
         if let Some(parameter) = self.sysctl.get_parameter(param_name) {
             let mut fallback_to_default = false;
+            if self.config.no_pager {
+                parameter.display_documentation(&mut self.stdout)?;
+                return Ok(());
+            }
             let pager = env::var("PAGER").unwrap_or_else(|_| String::from("less"));
             match Command::new(&pager).stdin(Stdio::piped()).spawn() {
                 Ok(mut process) => {

systeroid/src/args.rs

@@ -22,6 +22,8 @@ pub struct Args {
     pub display_type: DisplayType,
     /// Whether if the unknown variable errors should be ignored.
     pub ignore_errors: bool,
+    /// Do not pipe output into a pager.
+    pub no_pager: bool,
     /// Parameter to explain.
     pub param_to_explain: Option<String>,
     /// Parameter names.
@@ -51,6 +53,7 @@ impl Args {
             "set the path of the kernel documentation",
             "<path>",
         );
+        opts.optflag("P", "no-pager", "Do not pipe output into a pager");
         opts.optflag("h", "help", "display this help and exit");
         opts.optflag("V", "version", "output version information and exit");
 
@@ -90,6 +93,7 @@ impl Args {
                 kernel_docs: matches.opt_str("d").map(PathBuf::from),
                 display_type,
                 ignore_errors: matches.opt_present("e"),
+                no_pager: matches.opt_present("P"),
                 param_to_explain: matches.opt_str("explain"),
                 param_names: matches.free,
             })

systeroid/src/lib.rs

@@ -20,6 +20,7 @@ pub fn run(args: Args) -> Result<()> {
     config.sysctl.ignore_errors = args.ignore_errors;
     config.app.display_type = args.display_type;
     config.app.no_color = env::var("NO_COLOR").is_ok();
+    config.app.no_pager = args.no_pager;
     let mut sysctl = Sysctl::init(config.sysctl)?;
     let mut app = App::new(&mut sysctl, &config.app)?;