pr: add -e/--expand-tabs option parsing

src/uu/pr/locales/en-US.ftl

@@ -84,6 +84,7 @@ pr-help-indent =
 pr-help-join-lines =
   merge full lines, turns off -W line truncation, no column
                   alignment, --sep-string[=STRING] sets separators
+pr-help-expand-tabs = expand input CHARs (TABs) to tab WIDTH (8)
 pr-help-help = Print help information
 
 # Page header text

src/uu/pr/locales/fr-FR.ftl

@@ -83,6 +83,7 @@ pr-help-indent =
 pr-help-join-lines =
   fusionner les lignes complètes, désactive la troncature de ligne -W, aucun
                   alignement de colonne, --sep-string[=CHAÎNE] définit les séparateurs
+pr-help-expand-tabs = convertir les CHARs d'entrée (TABs) en largeur de tabulation WIDTH (8)
 pr-help-help = Afficher les informations d'aide
 
 # Texte d'en-tête de page

src/uu/pr/src/pr.rs

@@ -56,6 +56,7 @@ mod options {
     pub const MERGE: &str = "merge";
     pub const INDENT: &str = "indent";
     pub const JOIN_LINES: &str = "join-lines";
+    pub const EXPAND_TABS: &str = "expand-tabs";
     pub const HELP: &str = "help";
     pub const FILES: &str = "files";
 }
@@ -80,6 +81,8 @@ struct OutputOptions {
     join_lines: bool,
     col_sep_for_printing: String,
     line_width: Option<usize>,
+    #[allow(dead_code)] // TODO: implement tab expansion
+    expand_tabs: Option<(char, usize)>,
 }
 
 struct FileLine {
@@ -276,6 +279,7 @@ pub fn uu_app() -> Command {
         .arg(
             Arg::new(options::COLUMN)
                 .long(options::COLUMN)
+                .visible_alias("columns")
                 .help(translate!("pr-help-column"))
                 .value_name("column"),
         )
@@ -311,6 +315,14 @@ pub fn uu_app() -> Command {
                 .help(translate!("pr-help-indent"))
                 .value_name("margin"),
         )
+        .arg(
+            Arg::new(options::EXPAND_TABS)
+                .short('e')
+                .long(options::EXPAND_TABS)
+                .help(translate!("pr-help-expand-tabs"))
+                .value_name("[CHAR][WIDTH]")
+                .num_args(0..=1),
+        )
         .arg(
             Arg::new(options::JOIN_LINES)
                 .short('J')
@@ -525,6 +537,24 @@ fn build_options(
             }
         });
 
+    // If first char is a digit, entire string is WIDTH (e.g., -e8 -> tab, 8)
+    // Otherwise first char is CHAR, rest is WIDTH (e.g., -e:4 -> ':', 4)
+    let expand_tabs = matches
+        .get_one::<String>(options::EXPAND_TABS)
+        .map(|s| {
+            let (c, w) = s.chars().next().map_or((TAB, s.as_str()), |c| {
+                if c.is_ascii_digit() {
+                    (TAB, s.as_str())
+                } else {
+                    (c, &s[1..])
+                }
+            });
+            (c, w.parse().unwrap_or(8))
+        })
+        .or(matches
+            .contains_id(options::EXPAND_TABS)
+            .then_some((TAB, 8)));
+
     let double_space = matches.get_flag(options::DOUBLE_SPACE);
 
     let content_line_separator = if double_space {
@@ -761,6 +791,7 @@ fn build_options(
         join_lines,
         col_sep_for_printing,
         line_width,
+        expand_tabs,
     })
 }
 

tests/by-util/test_pr.rs

@@ -652,3 +652,20 @@ fn test_omit_pagination_option() {
         .pipe_in("a\nb\n")
         .succeeds();
 }
+
+#[test]
+fn test_expand_tabs_option() {
+    // TODO: implement actual tab expansion and verify output matches GNU pr
+    for arg in [
+        "-e",
+        "-e8",
+        "-e5",
+        "-e300",
+        "-e:8",
+        "--expand-tabs",
+        "--expand-tabs=8",
+        "--expand-tabs=:8",
+    ] {
+        new_ucmd!().args(&["-t", arg]).pipe_in("a\tb\n").succeeds();
+    }
+}