Add opt-in abbr_nix option to abbreviate Nix store paths in Command column

src/columns/command.rs

@@ -9,10 +9,11 @@ pub struct Command {
     fmt_contents: HashMap<i32, String>,
     raw_contents: HashMap<i32, String>,
     width: usize,
+    abbr_nix: bool,
 }
 
 impl Command {
-    pub fn new(header: Option<String>) -> Self {
+    pub fn new(header: Option<String>, abbr_nix: bool) -> Self {
         let header = header.unwrap_or_else(|| String::from("Command"));
         let unit = String::new();
         Self {
@@ -21,10 +22,38 @@ impl Command {
             width: 0,
             header,
             unit,
+            abbr_nix,
         }
     }
 }
 
+// Abbreviate a Nix store path so only the first 12 chars of the hash are kept,
+// followed by an ellipsis. Example: /nix/store/abc12345…-hello-2.12.1/bin/hello
+fn abbr_nix_store_path(s: &str) -> String {
+    let Some(rest) = s.strip_prefix("/nix/store/") else {
+        return s.to_string();
+    };
+    let Some(hash_end) = rest.find('-') else {
+        return s.to_string();
+    };
+    if hash_end >= 32 && rest.as_bytes()[..hash_end].iter().all(|b| b.is_ascii_hexdigit()) {
+        let (hash, name_and_more) = rest.split_at(hash_end);
+        // safe truncation: 12 chars of hash + ellipsis
+        let head = &hash[..12];
+        format!("/nix/store/{head}…{name_and_more}")
+    } else {
+        s.to_string()
+    }
+}
+
+fn abbr_nix_store(s: &str, abbr: bool) -> String {
+    if abbr {
+        abbr_nix_store_path(s)
+    } else {
+        s.to_string()
+    }
+}
+
 #[cfg(any(target_os = "linux", target_os = "android"))]
 impl Column for Command {
     fn add(&mut self, proc: &ProcessInfo) {
@@ -47,7 +76,7 @@ impl Column for Command {
         } else {
             proc.curr_proc.stat().comm.clone()
         };
-        let raw_content = fmt_content.clone();
+        let raw_content = abbr_nix_store(&fmt_content, self.abbr_nix);
 
         self.fmt_contents.insert(proc.pid, fmt_content);
         self.raw_contents.insert(proc.pid, raw_content);
@@ -79,7 +108,7 @@ impl Column for Command {
         } else {
             String::from("")
         };
-        let raw_content = fmt_content.clone();
+        let raw_content = abbr_nix_store(&fmt_content, self.abbr_nix);
 
         self.fmt_contents.insert(proc.pid, fmt_content);
         self.raw_contents.insert(proc.pid, raw_content);
@@ -92,7 +121,7 @@ impl Column for Command {
 impl Column for Command {
     fn add(&mut self, proc: &ProcessInfo) {
         let fmt_content = proc.command.clone();
-        let raw_content = fmt_content.clone();
+        let raw_content = abbr_nix_store(&fmt_content, self.abbr_nix);
 
         self.fmt_contents.insert(proc.pid, fmt_content);
         self.raw_contents.insert(proc.pid, raw_content);
@@ -120,7 +149,7 @@ impl Column for Command {
             x
         };
         let fmt_content = command;
-        let raw_content = fmt_content.clone();
+        let raw_content = abbr_nix_store(&fmt_content, self.abbr_nix);
 
         self.fmt_contents.insert(proc.pid, fmt_content);
         self.raw_contents.insert(proc.pid, raw_content);

src/columns/os_freebsd.rs

@@ -180,11 +180,12 @@ pub fn gen_column(
     _docker_path: &str,
     separator: &str,
     abbr_sid: bool,
+    abbr_nix: bool,
     tree_symbols: &[String; 5],
     procfs: Option<PathBuf>,
 ) -> Box<dyn Column> {
     match kind {
-        ConfigColumnKind::Command => Box::new(Command::new(header)),
+        ConfigColumnKind::Command => Box::new(Command::new(header, abbr_nix)),
         ConfigColumnKind::ContextSw => Box::new(ContextSw::new(header)),
         ConfigColumnKind::CpuTime => Box::new(CpuTime::new(header)),
         ConfigColumnKind::ElapsedTime => Box::new(ElapsedTime::new(header)),

src/columns/os_linux.rs

@@ -264,13 +264,14 @@ pub fn gen_column(
     _docker_path: &str,
     separator: &str,
     abbr_sid: bool,
+    abbr_nix: bool,
     tree_symbols: &[String; 5],
     procfs: Option<PathBuf>,
 ) -> Box<dyn Column> {
     match kind {
         ConfigColumnKind::Ccgroup => Box::new(Ccgroup::new(header)),
         ConfigColumnKind::Cgroup => Box::new(Cgroup::new(header)),
-        ConfigColumnKind::Command => Box::new(Command::new(header)),
+        ConfigColumnKind::Command => Box::new(Command::new(header, abbr_nix)),
         ConfigColumnKind::ContextSw => Box::new(ContextSw::new(header)),
         ConfigColumnKind::VoluntaryContextSw => Box::new(VoluntaryContextSw::new(header)),
         ConfigColumnKind::InvoluntaryContextSw => Box::new(InvoluntaryContextSw::new(header)),

src/columns/os_macos.rs

@@ -165,12 +165,13 @@ pub fn gen_column(
     _docker_path: &str,
     separator: &str,
     abbr_sid: bool,
+    abbr_nix: bool,
     tree_symbols: &[String; 5],
     _procfs: Option<PathBuf>,
 ) -> Box<dyn Column> {
     match kind {
         ConfigColumnKind::Arch => Box::new(Arch::new(header)),
-        ConfigColumnKind::Command => Box::new(Command::new(header)),
+        ConfigColumnKind::Command => Box::new(Command::new(header, abbr_nix)),
         ConfigColumnKind::ContextSw => Box::new(ContextSw::new(header)),
         ConfigColumnKind::CpuTime => Box::new(CpuTime::new(header)),
         #[cfg(feature = "docker")]

src/columns/os_windows.rs

@@ -114,11 +114,12 @@ pub fn gen_column(
     _docker_path: &str,
     separator: &str,
     abbr_sid: bool,
+    abbr_nix: bool,
     tree_symbols: &[String; 5],
     _procfs: Option<PathBuf>,
 ) -> Box<dyn Column> {
     match kind {
-        ConfigColumnKind::Command => Box::new(Command::new(header)),
+        ConfigColumnKind::Command => Box::new(Command::new(header, abbr_nix)),
         ConfigColumnKind::CpuTime => Box::new(CpuTime::new(header)),
         ConfigColumnKind::ElapsedTime => Box::new(ElapsedTime::new(header)),
         ConfigColumnKind::Empty => Box::new(Empty::new()),

src/config.rs

@@ -555,6 +555,8 @@ pub struct ConfigDisplay {
     pub tree_symbols: [String; 5],
     #[serde(default = "default_true")]
     pub abbr_sid: bool,
+    #[serde(default = "default_false")]
+    pub abbr_nix: bool,
     #[serde(default = "default_theme_auto")]
     pub theme: ConfigTheme,
     #[serde(default = "default_true")]
@@ -587,6 +589,7 @@ impl Default for ConfigDisplay {
                 String::from("└"),
             ],
             abbr_sid: true,
+            abbr_nix: false,
             theme: ConfigTheme::Auto,
             show_kthreads: true,
         }

src/view.rs

@@ -136,6 +136,7 @@ impl View {
                     &config.docker.path,
                     &config.display.separator,
                     config.display.abbr_sid,
+                    config.display.abbr_nix,
                     &config.display.tree_symbols,
                     opt.procfs.clone(),
                 );