From f32918791325eb88cd7376bd836130f7ddd287cf Mon Sep 17 00:00:00 2001
From: Devel08 <Denislav08@proton.me>
Date: Sat, 9 May 2026 14:01:15 +0300
Subject: [PATCH 1/3] implement version command

---
 src/sed/compiler.rs | 61 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/src/sed/compiler.rs b/src/sed/compiler.rs
index bcfff31..6827834 100644
--- a/src/sed/compiler.rs
+++ b/src/sed/compiler.rs
@@ -1254,6 +1254,63 @@ fn compile_text_command_posix(
     Ok(CommandHandling::Continue)
 }
 
+// Handle v
+fn compile_version_command(
+    lines: &mut ScriptLineProvider,
+    line: &mut ScriptCharProvider,
+    _cmd: &mut Command,
+    _context: &mut ProcessingContext,
+) -> UResult<CommandHandling> {
+    // GNU sed 4.9
+    const GNU_MAJOR: u8 = 4;
+    const GNU_MINOR: u8 = 9;
+    const GNU_PATCH: u8 = 0;
+
+    line.advance();
+    line.eat_spaces(); // Skip any leading whitespace.
+
+    let mut major = String::new();
+    let mut minor = String::new();
+    let mut patch = String::new();
+
+    let mut ver_semantic = 0;
+
+    while !line.eol() {
+        if line.current() == '.' {
+            ver_semantic += 1;
+            line.advance();
+        } else {
+            match ver_semantic {
+                0 => major.push(line.current()),
+                1 => minor.push(line.current()),
+                2 => patch.push(line.current()),
+                _ => return compilation_error(lines, line, "invalid version of sed"),
+            }
+            line.advance();
+        }
+    }
+
+    if patch.is_empty() {
+        patch = "0".to_string();
+    }
+
+    match major.parse::<u8>() {
+        Ok(major_int) => match minor.parse::<u8>() {
+            Ok(minor_int) => match patch.parse::<u8>() {
+                Ok(patch_int) => {
+                    if minor_int <= GNU_MINOR && major_int <= GNU_MAJOR && patch_int == GNU_PATCH {
+                        return Ok(CommandHandling::Continue);
+                    }
+                    compilation_error(lines, line, "expected newer version of sed")
+                }
+                Err(_) => compilation_error(lines, line, "invalid version of sed"),
+            },
+            Err(_) => compilation_error(lines, line, "invalid version of sed"),
+        },
+        Err(_) => compilation_error(lines, line, "invalid version of sed"),
+    }
+}
+
 // Return the specification for the command letter at the current line position
 // checking for diverse errors.
 fn get_verified_cmd_spec(
@@ -1356,6 +1413,10 @@ fn get_cmd_spec(
             n_addr: 2,
             handler: compile_trans_command,
         }),
+        'v' => Ok(CommandSpec {
+            n_addr: 0,
+            handler: compile_version_command,
+        }),
         _ => compilation_error(lines, line, format!("invalid command code `{cmd_code}'")),
     }
 }

From 10d7c3b422a42b686870da0d2b9c72203b680cd6 Mon Sep 17 00:00:00 2001
From: Devel08 <Denislav08@proton.me>
Date: Sat, 9 May 2026 14:02:47 +0300
Subject: [PATCH 2/3] add tests for version option

---
 tests/by-util/test_sed.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/by-util/test_sed.rs b/tests/by-util/test_sed.rs
index b31fed7..9fd589d 100644
--- a/tests/by-util/test_sed.rs
+++ b/tests/by-util/test_sed.rs
@@ -1303,3 +1303,19 @@ fn test_print_first_line_no_newline() {
         .succeeds()
         .stdout_is("foo");
 }
+
+#[test]
+fn test_expected_newer_version() {
+    new_ucmd!()
+        .args(&["v4.10"])
+        .fails()
+        .stderr_is("sed: <script argument 1>:1:6: error: expected newer version of sed\n");
+}
+
+#[test]
+fn test_invalid_version() {
+    new_ucmd!()
+        .args(&["v4.a"])
+        .fails()
+        .stderr_is("sed: <script argument 1>:1:5: error: invalid version of sed\n");
+}

From 497cb2a611a8641934fe84837baac7da87aa44f5 Mon Sep 17 00:00:00 2001
From: Devel08 <Denislav08@proton.me>
Date: Sat, 9 May 2026 22:18:08 +0300
Subject: [PATCH 3/3] fix patch comparsion

---
 src/sed/compiler.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sed/compiler.rs b/src/sed/compiler.rs
index 6827834..18dbd67 100644
--- a/src/sed/compiler.rs
+++ b/src/sed/compiler.rs
@@ -1298,7 +1298,7 @@ fn compile_version_command(
         Ok(major_int) => match minor.parse::<u8>() {
             Ok(minor_int) => match patch.parse::<u8>() {
                 Ok(patch_int) => {
-                    if minor_int <= GNU_MINOR && major_int <= GNU_MAJOR && patch_int == GNU_PATCH {
+                    if minor_int <= GNU_MINOR && major_int <= GNU_MAJOR && patch_int <= GNU_PATCH {
                         return Ok(CommandHandling::Continue);
                     }
                     compilation_error(lines, line, "expected newer version of sed")