feat: add counters to bulk rename function

yazi-actor/Cargo.toml

@@ -30,16 +30,17 @@ yazi-watcher   = { path = "../yazi-watcher", version = "25.9.15" }
 yazi-widgets   = { path = "../yazi-widgets", version = "25.9.15" }
 
 # External dependencies
-anyhow       = { workspace = true }
-crossterm    = { workspace = true }
-futures      = { workspace = true }
-hashbrown    = { workspace = true }
-mlua         = { workspace = true }
-paste        = { workspace = true }
-scopeguard   = { workspace = true }
-tokio        = { workspace = true }
-tokio-stream = { workspace = true }
-tracing      = { workspace = true }
+anyhow        = { workspace = true }
+crossterm     = { workspace = true }
+futures       = { workspace = true }
+hashbrown     = { workspace = true }
+mlua          = { workspace = true }
+paste         = { workspace = true }
+scopeguard    = { workspace = true }
+tokio         = { workspace = true }
+tokio-stream  = { workspace = true }
+tracing       = { workspace = true }
+unicode-width = { workspace = true }
 
 [target."cfg(unix)".dependencies]
 libc = { workspace = true }

yazi-actor/src/mgr/bulk_rename.rs

@@ -19,6 +19,12 @@ use crate::{Actor, Ctx};
 
 pub struct BulkRename;
 
+mod counters;
+mod filename_template;
+mod name_generator;
+
+use name_generator::generate_names;
+
 impl Actor for BulkRename {
 	type Options = VoidOpt;
 
@@ -60,22 +66,38 @@ impl Actor for BulkRename {
 			defer!(AppProxy::resume());
 			AppProxy::stop().await;
 
-			let new: Vec<_> = Local
-				.read_to_string(&tmp)
-				.await?
-				.lines()
-				.take(old.len())
-				.enumerate()
-				.map(|(i, s)| Tuple::new(i, s))
-				.collect();
-
+			let new_names = Local.read_to_string(&tmp).await?;
+			let new = Self::parse_new_names(&new_names, old.len()).await?;
 			Self::r#do(root, old, new, selected).await
 		});
 		succ!();
 	}
 }
 
 impl BulkRename {
+	/// Reads a number of lines from a string, attempting to parse them as either
+	/// fixed filenames or counter-based templates.
+	///
+	/// The number of expected lines should match `expected_count`.
+	/// If parsing fails, displays all errors to the user and waits for ENTER
+	/// before returning an error.
+	async fn parse_new_names(new_names: &str, expected_count: usize) -> Result<Vec<Tuple>> {
+		match generate_names(&mut new_names.lines().take(expected_count)) {
+			Ok(paths) => Ok(paths),
+			Err(errors) => {
+				// Show all parse errors in TTY, then return an error
+				terminal_clear(TTY.writer())?;
+				let err = format! {"Found errors in the filenames:\n\n{errors}\nPress ENTER to exit"};
+				execute!(TTY.writer(), Print(err),)?;
+				// Wait for user input
+				TTY.reader().read_exact(&mut [0])?;
+
+				// Return an error to skip further rename
+				Err(anyhow::anyhow!("Parsing errors in rename lines"))
+			}
+		}
+	}
+
 	async fn r#do(
 		root: usize,
 		old: Vec<Tuple>,

yazi-actor/src/mgr/bulk_rename/counters/ansi.rs

@@ -0,0 +1,64 @@
+//! This module provides functionality for managing ANSI letter counters for both
+//! uppercase and lowercase letters, following Excel's alphabetic counter style.
+
+use super::{CounterFormatter, LOWERCASE, UPPERCASE, write_number_as_letters_gen};
+use std::fmt;
+
+/// A helper structure for generating uppercase ANSI letters (e.g., A, B, ..., AA, AB).
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct AnsiUpper;
+
+/// A helper structure for generating lowercase ANSI letters (e.g., a, b, ..., aa, ab).
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct AnsiLower;
+
+impl_counter_formatter! { AnsiUpper, UPPERCASE }
+impl_counter_formatter! { AnsiLower, LOWERCASE }
+
+/// Converts ANSI letters (e.g., "A", "Z", "AA") to their corresponding numeric values.
+/// The conversion follows Excel's alphabetic counter rules: 'A' = 1, 'B' = 2, ...,
+/// 'Z' = 26, 'AA' = 27, etc.
+///
+/// The `UPPERCASE` constant determines whether the string should be validated
+/// as uppercase or lowercase.
+///
+/// # Returns
+///
+/// Returns `Some(u32)` if conversion is successful; otherwise, returns `None`.
+#[inline]
+fn convert_letters_to_number<const UPPERCASE: bool>(value: &str) -> Option<u32> {
+	if value.is_empty() {
+		return None;
+	}
+
+	if UPPERCASE {
+		if !value.chars().all(|c| c.is_ascii_uppercase()) {
+			return None;
+		}
+	} else if !value.chars().all(|c| c.is_ascii_lowercase()) {
+		return None;
+	}
+
+	let result = value.chars().rev().enumerate().fold(0_u32, |acc, (i, c)| {
+		acc + ((c as u32) - (if UPPERCASE { 'A' } else { 'a' } as u32) + 1) * 26_u32.pow(i as u32)
+	});
+
+	Some(result)
+}
+
+/// Writes the numeric value as ANSI letters (e.g., 1 → "A", 27 → "AA") into the provided buffer.
+///
+/// # Arguments
+///
+/// * `num` - The numeric value to convert.
+/// * `width` - The minimum width of the generated string, padded with zeros if necessary.
+/// * `buf` - The buffer to write the resulting string into.
+#[inline]
+fn write_number_as_letters<const UPPERCASE: bool>(
+	num: u32,
+	width: usize,
+	buf: &mut impl fmt::Write,
+) -> fmt::Result {
+	let base = if UPPERCASE { b'A' } else { b'a' };
+	write_number_as_letters_gen(num, width, 26, |r| (base + r as u8) as char, buf)
+}

yazi-actor/src/mgr/bulk_rename/counters/cyrillic.rs

@@ -0,0 +1,104 @@
+//! This module provides functionality for managing Cyrillic letter counters for both
+//! uppercase and lowercase letters, following Excel's alphabetic counter style.
+
+use super::{CounterFormatter, LOWERCASE, UPPERCASE, write_number_as_letters_gen};
+use std::fmt;
+
+/// An array of uppercase Cyrillic letters used for indexing and mapping.
+/// This array includes all uppercase Cyrillic letters excluding 'Ё', 'Й', 'Ъ', 'Ы', 'Ь'.
+const UPPERCASE_CYRILLIC: [char; 28] = [
+	'А', 'Б', 'В', 'Г', 'Д', 'Е', 'Ж', 'З', 'И', 'К', 'Л', 'М', 'Н', 'О', 'П', 'Р', 'С', 'Т', 'У',
+	'Ф', 'Х', 'Ц', 'Ч', 'Ш', 'Щ', 'Э', 'Ю', 'Я',
+];
+
+/// An array of lowercase Cyrillic letters used for indexing and mapping.
+/// This array includes all lowercase Cyrillic letters excluding 'ё', 'й', 'ъ', 'ы', 'ь'.
+const LOWERCASE_CYRILLIC: [char; 28] = [
+	'а', 'б', 'в', 'г', 'д', 'е', 'ж', 'з', 'и', 'к', 'л', 'м', 'н', 'о', 'п', 'р', 'с', 'т', 'у',
+	'ф', 'х', 'ц', 'ч', 'ш', 'щ', 'э', 'ю', 'я',
+];
+
+/// A helper structure for generating uppercase Cyrillic letters (e.g., А, Б, В, ..., АА, АБ),
+/// while excluding 'Ё', 'Й', 'Ъ', 'Ы' and 'Ь'.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct CyrillicUpper;
+
+/// A helper structure for generating lowercase Cyrillic letters (e.g., а, б, в, ..., аа, аб),
+/// while excluding 'ё', 'й', 'ъ', 'ы' and 'ь'.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct CyrillicLower;
+
+impl_counter_formatter! { CyrillicUpper, UPPERCASE }
+impl_counter_formatter! { CyrillicLower, LOWERCASE }
+
+/// Converts Cyrillic letters (e.g., "Б", "В", "БА") to their corresponding numeric values.
+/// The conversion follows Excel's alphabetic counter rules: 'А' = 1, 'Б' = 2, ...,
+/// 'Я' = 28, 'АА' = 29, etc.
+///
+/// The `UPPERCASE` constant determines whether the string should be validated
+/// as uppercase or lowercase.
+///
+/// # Returns
+///
+/// Returns `Some(u32)` if conversion is successful; otherwise, returns `None`.
+#[inline]
+fn convert_letters_to_number<const UPPERCASE: bool>(value: &str) -> Option<u32> {
+	if invalid_string::<UPPERCASE>(value) {
+		return None;
+	}
+	let lookup = if UPPERCASE { &UPPERCASE_CYRILLIC } else { &LOWERCASE_CYRILLIC };
+
+	let result = value.chars().rev().enumerate().fold(0_u32, |acc, (i, c)| {
+		if let Some(index) = lookup.iter().position(|&x| x == c) {
+			acc + (index as u32 + 1) * 28_u32.pow(i as u32)
+		} else {
+			acc
+		}
+	});
+	Some(result)
+}
+
+/// Writes the numeric value as Cyrillic letters (e.g., 1 → "А", 28 → "Я") into the provided buffer.
+///
+/// # Arguments
+///
+/// * `num` - The numeric value to convert.
+/// * `width` - The minimum width of the generated string, padded with zeros if necessary.
+/// * `buf` - The buffer to write the resulting string into.
+#[inline]
+fn write_number_as_letters<const UPPERCASE: bool>(
+	num: u32,
+	width: usize,
+	buf: &mut impl fmt::Write,
+) -> fmt::Result {
+	let lookup = if UPPERCASE { &UPPERCASE_CYRILLIC } else { &LOWERCASE_CYRILLIC };
+
+	write_number_as_letters_gen(num, width, 28, |remainder| lookup[remainder as usize], buf)
+}
+
+/// Checks if a string is non-empty and consists only of valid uppercase or
+/// lowercase Cyrillic letters, excluding 'Ё', 'Й', 'Ъ', 'Ы', and 'Ь'
+/// ('ё', 'й', 'ъ', 'ы' and 'ь').
+///
+/// The `UPPERCASE` constant determines whether to check uppercase or lowercase letters.
+///
+/// # Returns
+///
+/// Returns `true` if the string is invalid; otherwise, returns `false`.
+#[inline]
+fn invalid_string<const UPPERCASE: bool>(str: &str) -> bool {
+	if str.is_empty() {
+		return true;
+	}
+	if UPPERCASE {
+		!str.chars().all(|c| {
+			// ('А'..='Я') == ('\u{0410}'..='\u{042F}')
+			('\u{0410}'..='\u{042F}').contains(&c) && !matches!(c, 'Ё' | 'Й' | 'Ъ' | 'Ы' | 'Ь')
+		})
+	} else {
+		!str.chars().all(|c| {
+			// ('а'..='я') == ('\u{0430}'..='\u{044F}')
+			('\u{0430}'..='\u{044F}').contains(&c) && !matches!(c, 'ё' | 'й' | 'ъ' | 'ы' | 'ь')
+		})
+	}
+}

yazi-actor/src/mgr/bulk_rename/counters/digit.rs

@@ -0,0 +1,33 @@
+//! This module provides functionality for managing Arabic numeral counters.
+
+use super::CounterFormatter;
+use std::fmt;
+
+/// A helper structure for generating numeric values (e.g., 1, 2, ..., 999 or 001, 002).
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Digits;
+
+impl CounterFormatter for Digits {
+	/// Formats a value as a zero-padded string and writes it to a buffer.
+	///
+	/// # Arguments
+	///
+	/// * `value` - The numeric value to format.
+	/// * `width` - The minimum width of the output string.
+	/// * `buf` - A mutable reference to a buffer.
+	#[inline]
+	fn value_to_buffer(
+		self,
+		value: u32,
+		width: usize,
+		buf: &mut impl fmt::Write,
+	) -> Result<(), fmt::Error> {
+		write!(buf, "{value:0>width$}")
+	}
+
+	/// Parses a zero-padded numeric string into a `u32` value.
+	#[inline]
+	fn string_to_value(self, value: &str) -> Option<u32> {
+		value.parse().ok()
+	}
+}