[ownership] add --owner arg parsing and storage

src/app.rs

@@ -524,6 +524,15 @@ pub fn build_app() -> App<'static, 'static> {
                 ),
         );
 
+    if cfg!(unix) {
+        app = app.arg(
+            Arg::with_name("owner")
+                .long("owner")
+                .short("o")
+                .takes_value(true),
+        );
+    }
+
     // Make `--one-file-system` available only on Unix and Windows platforms, as per the
     // restrictions on the corresponding option in the `ignore` crate.
     // Provide aliases `mount` and `xdev` for people coming from `find`.

src/main.rs

@@ -25,6 +25,8 @@ use regex::bytes::{RegexBuilder, RegexSetBuilder};
 use crate::exec::CommandTemplate;
 use crate::exit_codes::ExitCode;
 use crate::filetypes::FileTypes;
+#[cfg(unix)]
+use crate::filter::OwnerFilter;
 use crate::filter::{SizeFilter, TimeFilter};
 use crate::options::Options;
 use crate::regex_helper::pattern_has_uppercase_char;
@@ -275,6 +277,13 @@ fn run() -> Result<ExitCode> {
         }
     }
 
+    #[cfg(unix)]
+    let owner_constraint = if let Some(s) = matches.value_of("owner") {
+        Some(OwnerFilter::from_string(s)?)
+    } else {
+        None
+    };
+
     let config = Options {
         case_sensitive,
         search_full_path: matches.is_present("full-path"),
@@ -358,6 +367,8 @@ fn run() -> Result<ExitCode> {
             .unwrap_or_else(|| vec![]),
         size_constraints: size_limits,
         time_constraints,
+        #[cfg(unix)]
+        owner_constraint,
         show_filesystem_errors: matches.is_present("show-errors"),
         path_separator,
         max_results: matches

src/options.rs

@@ -5,6 +5,8 @@ use regex::bytes::RegexSet;
 
 use crate::exec::CommandTemplate;
 use crate::filetypes::FileTypes;
+#[cfg(unix)]
+use crate::filter::OwnerFilter;
 use crate::filter::{SizeFilter, TimeFilter};
 
 /// Configuration options for *fd*.
@@ -82,6 +84,10 @@ pub struct Options {
     /// Constraints on last modification time of files
     pub time_constraints: Vec<TimeFilter>,
 
+    #[cfg(unix)]
+    /// User/group ownership constraint
+    pub owner_constraint: Option<OwnerFilter>,
+
     /// Whether or not to display filesystem errors
     pub show_filesystem_errors: bool,