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Added auto-indent to multi-line editing -m Added shopt for enabling/disabling auto-indent -m Fixed some multi-line editing render bugs -m Scrolling up in history now preserves undo/redo history in the pending command

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This commit is contained in:
pagedmov
2026-02-23 20:52:33 -05:00
parent fa3d376659
commit 46d6d5319f
7 changed files with 134 additions and 55 deletions
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7
nix/hm-module.nix
View File

@@ -84,12 +84,6 @@ in
default = true;
description = "Whether to enable syntax highlighting in the shell";
};
tabStop = lib.mkOption {
type = lib.types.int;
default = 4;
description = "The number of spaces to use for tab stop in the shell";
};
extraPostConfig = lib.mkOption {
type = lib.types.str;
default = "";
@@ -123,7 +117,6 @@ in
"shopt prompt.trunc_prompt_path=${toString cfg.settings.promptPathSegments}"
"shopt prompt.comp_limit=${toString cfg.settings.completionLimit}"
"shopt prompt.highlight=${boolToString cfg.settings.syntaxHighlighting}"
"shopt prompt.tab_stop=${toString cfg.settings.tabStop}"
])
cfg.settings.extraPostConfig
];

3
src/parse/lex.rs
View File

@@ -265,11 +265,12 @@ impl LexStream {
}
if !found_fd && !self.flags.contains(LexFlags::LEX_UNFINISHED) {
let span_start = self.cursor;
self.cursor = pos;
return Some(Err(ShErr::full(
ShErrKind::ParseErr,
"Invalid redirection",
Span::new(self.cursor..pos, self.source.clone()),
Span::new(span_start..pos, self.source.clone()),
)));
} else {
tk = self.get_token(self.cursor..pos, TkRule::Redir);

13
src/prompt/readline/history.rs
View File

@@ -9,7 +9,7 @@ use std::{
time::{Duration, SystemTime, UNIX_EPOCH},
};
use crate::libsh::error::{ShErr, ShErrKind, ShResult};
use crate::{libsh::error::{ShErr, ShErrKind, ShResult}, prompt::readline::linebuf::LineBuf};
use crate::prelude::*;
use super::vicmd::Direction; // surprisingly useful
@@ -207,7 +207,7 @@ fn dedupe_entries(entries: &[HistEntry]) -> Vec<HistEntry> {
pub struct History {
path: PathBuf,
pub pending: Option<(String, usize)>, // command, cursor_pos
pub pending: Option<LineBuf>, // command, cursor_pos
entries: Vec<HistEntry>,
search_mask: Vec<HistEntry>,
no_matches: bool,
@@ -272,7 +272,7 @@ impl History {
pub fn update_pending_cmd(&mut self, buf: (&str, usize)) {
let cursor_pos = if let Some(pending) = &self.pending {
pending.1
pending.cursor.get()
} else {
buf.1
};
@@ -282,7 +282,10 @@ impl History {
term: cmd.clone(),
};
self.pending = Some((cmd, cursor_pos));
if let Some(pending) = &mut self.pending {
pending.set_buffer(cmd);
pending.cursor.set(cursor_pos);
}
self.constrain_entries(constraint);
}
@@ -340,7 +343,7 @@ impl History {
}
pub fn get_hint(&self) -> Option<String> {
if self.at_pending() && self.pending.as_ref().is_some_and(|p| !p.0.is_empty()) {
if self.at_pending() && self.pending.as_ref().is_some_and(|p| !p.buffer.is_empty()) {
let entry = self.hint_entry()?;
Some(entry.command().to_string())
} else {

66
src/prompt/readline/linebuf.rs
View File

@@ -14,8 +14,7 @@ use crate::{
libsh::{
error::ShResult,
term::{Style, Styled},
},
prelude::*, prompt::readline::{markers, register::write_register},
}, parse::lex::{LexFlags, LexStream, Tk, TkFlags, TkRule}, prelude::*, prompt::readline::{markers, register::write_register}, state::read_shopts
};
const PUNCTUATION: [&str; 3] = ["?", "!", "."];
@@ -327,6 +326,7 @@ pub struct LineBuf {
pub insert_mode_start_pos: Option<usize>,
pub saved_col: Option<usize>,
pub auto_indent_level: usize,
pub undo_stack: Vec<Edit>,
pub redo_stack: Vec<Edit>,
@@ -409,7 +409,6 @@ impl LineBuf {
.unwrap_or(self.buffer.len())
}
/// Update self.grapheme_indices with the indices of the current buffer
#[track_caller]
pub fn update_graphemes(&mut self) {
let indices: Vec<_> = self.buffer.grapheme_indices(true).map(|(i, _)| i).collect();
self.cursor.set_max(indices.len());
@@ -1884,6 +1883,29 @@ impl LineBuf {
let end = start + gr.len();
self.buffer.replace_range(start..end, new);
}
pub fn calc_indent_level(&mut self) {
let input = Arc::new(self.buffer.clone());
let Ok(tokens) = LexStream::new(input, LexFlags::LEX_UNFINISHED).collect::<ShResult<Vec<Tk>>>() else {
log::error!("Failed to lex buffer for indent calculation");
return;
};
let mut level: usize = 0;
for tk in tokens {
if tk.flags.contains(TkFlags::KEYWORD) {
match tk.as_str() {
"then" | "do" => level += 1,
"done" | "fi" | "esac" => level = level.saturating_sub(1),
_ => { /* Continue */ }
}
} else if tk.class == TkRule::BraceGrpStart {
level += 1;
} else if tk.class == TkRule::BraceGrpEnd {
level = level.saturating_sub(1);
}
}
self.auto_indent_level = level;
}
pub fn eval_motion(&mut self, verb: Option<&Verb>, motion: MotionCmd) -> MotionKind {
let buffer = self.buffer.clone();
if self.has_hint() {
@@ -2669,12 +2691,13 @@ impl LineBuf {
}
}
Verb::Dedent => {
let Some((start, end)) = self.range_from_motion(&motion) else {
let Some((start, mut end)) = self.range_from_motion(&motion) else {
return Ok(());
};
if self.grapheme_at(start) == Some("\t") {
self.remove(start);
}
end = end.min(self.grapheme_indices().len().saturating_sub(1));
let mut range_indices = self.grapheme_indices()[start..end].to_vec().into_iter();
while let Some(idx) = range_indices.next() {
let gr = self.grapheme_at(idx).unwrap();
@@ -2704,14 +2727,32 @@ impl LineBuf {
Verb::Equalize => todo!(),
Verb::InsertModeLineBreak(anchor) => {
let (mut start, end) = self.this_line();
let auto_indent = read_shopts(|o| o.prompt.auto_indent);
if start == 0 && end == self.cursor.max {
match anchor {
Anchor::After => {
self.push('\n');
if auto_indent {
log::debug!("Calculating indent level for new line");
self.calc_indent_level();
log::debug!("Auto-indent level: {}", self.auto_indent_level);
let tabs = (0..self.auto_indent_level).map(|_| '\t');
for tab in tabs {
log::debug!("Pushing tab for auto-indent");
self.push(tab);
}
}
self.cursor.set(self.cursor_max());
return Ok(());
}
Anchor::Before => {
if auto_indent {
self.calc_indent_level();
let tabs = (0..self.auto_indent_level).map(|_| '\t');
for tab in tabs {
self.insert_at(0, tab);
}
}
self.insert_at(0, '\n');
self.cursor.set(0);
return Ok(());
@@ -2724,11 +2765,28 @@ impl LineBuf {
Anchor::After => {
self.cursor.set(end);
self.insert_at_cursor('\n');
self.cursor.add(1);
if auto_indent {
self.calc_indent_level();
let tabs = (0..self.auto_indent_level).map(|_| '\t');
for tab in tabs {
self.insert_at_cursor(tab);
self.cursor.add(1);
}
}
}
Anchor::Before => {
self.cursor.set(start);
self.insert_at_cursor('\n');
self.cursor.add(1);
if auto_indent {
self.calc_indent_level();
let tabs = (0..self.auto_indent_level).map(|_| '\t');
for tab in tabs {
self.insert_at_cursor(tab);
self.cursor.add(1);
}
}
}
}
}

20
src/prompt/readline/mod.rs
View File

@@ -249,7 +249,8 @@ impl FernVi {
if cmd.should_submit() {
self.editor.set_hint(None);
self.print_line()?;
self.editor.cursor.set(self.editor.cursor_max()); // Move the cursor to the very end
self.print_line()?; // Redraw
self.writer.flush_write("\n")?;
let buf = self.editor.take_buf();
// Save command to history if auto_hist is enabled
@@ -305,8 +306,7 @@ impl FernVi {
pub fn get_layout(&mut self, line: &str) -> Layout {
let to_cursor = self.editor.slice_to_cursor().unwrap_or_default();
let (cols, _) = get_win_size(*TTY_FILENO);
let tab_stop = crate::state::read_shopts(|s| s.prompt.tab_stop) as u16;
Layout::from_parts(tab_stop, cols, &self.prompt, to_cursor, line)
Layout::from_parts(cols, &self.prompt, to_cursor, line)
}
pub fn scroll_history(&mut self, cmd: ViCmd) {
/*
@@ -324,18 +324,20 @@ impl FernVi {
};
let entry = self.history.scroll(count);
if let Some(entry) = entry {
let cursor_pos = self.editor.cursor.get();
let pending = self.editor.take_buf();
let editor = std::mem::take(&mut self.editor);
self.editor.set_buffer(entry.command().to_string());
if self.history.pending.is_none() {
self.history.pending = Some((pending, cursor_pos));
self.history.pending = Some(editor);
}
self.editor.set_hint(None);
self.editor.move_cursor_to_end();
} else if let Some(pending) = self.history.pending.take() {
self.editor.set_buffer(pending.0);
self.editor.cursor.set(pending.1);
self.editor.set_hint(None);
self.editor = pending;
} else {
// If we are here it should mean we are on our pending command
// And the user tried to scroll history down
// Since there is no "future" history, we should just bell and do nothing
self.writer.send_bell().ok();
}
}
pub fn should_accept_hint(&self, event: &KeyEvent) -> bool {

40
src/prompt/readline/term.rs
View File

@@ -107,6 +107,30 @@ fn write_all(fd: RawFd, buf: &str) -> nix::Result<()> {
Ok(())
}
/// Check if a string ends with a newline, ignoring any trailing ANSI escape sequences.
fn ends_with_newline(s: &str) -> bool {
let bytes = s.as_bytes();
let mut i = bytes.len();
while i > 0 {
// ANSI CSI sequences end with an alphabetic byte (e.g. \x1b[0m)
if bytes[i - 1].is_ascii_alphabetic() {
let term = i - 1;
let mut j = term;
// Walk back past parameter bytes (digits and ';')
while j > 0 && (bytes[j - 1].is_ascii_digit() || bytes[j - 1] == b';') {
j -= 1;
}
// Check for CSI introducer \x1b[
if j >= 2 && bytes[j - 1] == b'[' && bytes[j - 2] == 0x1b {
i = j - 2;
continue;
}
}
break;
}
i > 0 && bytes[i - 1] == b'\n'
}
// Big credit to rustyline for this
fn width(s: &str, esc_seq: &mut u8) -> u16 {
let w_calc = width_calculator();
@@ -734,15 +758,14 @@ impl Layout {
}
}
pub fn from_parts(
tab_stop: u16,
term_width: u16,
prompt: &str,
to_cursor: &str,
to_end: &str,
) -> Self {
let prompt_end = Self::calc_pos(tab_stop, term_width, prompt, Pos { col: 0, row: 0 });
let cursor = Self::calc_pos(tab_stop, term_width, to_cursor, prompt_end);
let end = Self::calc_pos(tab_stop, term_width, to_end, prompt_end);
let prompt_end = Self::calc_pos(term_width, prompt, Pos { col: 0, row: 0 });
let cursor = Self::calc_pos(term_width, to_cursor, prompt_end);
let end = Self::calc_pos(term_width, to_end, prompt_end);
Layout {
w_calc: width_calculator(),
prompt_end,
@@ -751,7 +774,8 @@ impl Layout {
}
}
pub fn calc_pos(tab_stop: u16, term_width: u16, s: &str, orig: Pos) -> Pos {
pub fn calc_pos(term_width: u16, s: &str, orig: Pos) -> Pos {
const TAB_STOP: u16 = 8;
let mut pos = orig;
let mut esc_seq = 0;
for c in s.graphemes(true) {
@@ -760,7 +784,7 @@ impl Layout {
pos.col = 0;
}
let c_width = if c == "\t" {
tab_stop - (pos.col % tab_stop)
TAB_STOP - (pos.col % TAB_STOP)
} else {
width(c, &mut esc_seq)
};
@@ -790,7 +814,6 @@ pub struct TermWriter {
t_cols: Col, // terminal width
buffer: String,
w_calc: Box<dyn WidthCalculator>,
tab_stop: u16,
}
impl TermWriter {
@@ -802,7 +825,6 @@ impl TermWriter {
t_cols,
buffer: String::new(),
w_calc,
tab_stop: 8, // TODO: add a way to configure this
}
}
pub fn get_cursor_movement(&self, old: Pos, new: Pos) -> ShResult<String> {
@@ -959,7 +981,7 @@ impl LineWriter for TermWriter {
self.buffer.push_str(prompt);
self.buffer.push_str(line);
if end.col == 0 && end.row > 0 && !self.buffer.ends_with('\n') {
if end.col == 0 && end.row > 0 && !ends_with_newline(&self.buffer) {
// The line has wrapped. We need to use our own line break.
self.buffer.push('\n');
}

24
src/shopt.rs
View File

@@ -371,7 +371,7 @@ pub struct ShOptPrompt {
pub edit_mode: FernEditMode,
pub comp_limit: usize,
pub highlight: bool,
pub tab_stop: usize,
pub auto_indent: bool
}
impl ShOptPrompt {
@@ -413,14 +413,14 @@ impl ShOptPrompt {
};
self.highlight = val;
}
"tab_stop" => {
let Ok(val) = val.parse::<usize>() else {
"auto_indent" => {
let Ok(val) = val.parse::<bool>() else {
return Err(ShErr::simple(
ShErrKind::SyntaxErr,
"shopt: expected a positive integer for tab_stop value",
"shopt: expected 'true' or 'false' for auto_indent value",
));
};
self.tab_stop = val;
self.auto_indent = val;
}
"custom" => {
todo!()
@@ -440,7 +440,7 @@ impl ShOptPrompt {
"edit_mode",
"comp_limit",
"highlight",
"tab_stop",
"auto_indent",
"custom",
]),
),
@@ -480,9 +480,9 @@ impl ShOptPrompt {
output.push_str(&format!("{}", self.highlight));
Ok(Some(output))
}
"tab_stop" => {
let mut output = String::from("The number of spaces used by the tab character '\\t'\n");
output.push_str(&format!("{}", self.tab_stop));
"auto_indent" => {
let mut output = String::from("Whether to automatically indent new lines in multiline commands\n");
output.push_str(&format!("{}", self.auto_indent));
Ok(Some(output))
}
_ => Err(
@@ -499,7 +499,7 @@ impl ShOptPrompt {
"edit_mode",
"comp_limit",
"highlight",
"tab_stop",
"auto_indent",
]),
),
),
@@ -515,7 +515,7 @@ impl Display for ShOptPrompt {
output.push(format!("edit_mode = {}", self.edit_mode));
output.push(format!("comp_limit = {}", self.comp_limit));
output.push(format!("highlight = {}", self.highlight));
output.push(format!("tab_stop = {}", self.tab_stop));
output.push(format!("auto_indent = {}", self.auto_indent));
let final_output = output.join("\n");
@@ -530,7 +530,7 @@ impl Default for ShOptPrompt {
edit_mode: FernEditMode::Vi,
comp_limit: 100,
highlight: true,
tab_stop: 4,
auto_indent: true
}
}
}