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WIP: staged changes before destructive reset

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This commit is contained in:
Priec
2025-08-10 10:55:23 +02:00
parent 06106dc31b
commit e2c9cc4347
2 changed files with 209 additions and 398 deletions
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1
.gitignore vendored
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@@ -5,3 +5,4 @@ server/tantivy_indexes
steel_decimal/tests/property_tests.proptest-regressions steel_decimal/tests/property_tests.proptest-regressions
.direnv/ .direnv/
canvas/*.toml canvas/*.toml
.aider*

606
canvas/src/editor.rs
View File

@@ -21,6 +21,9 @@ pub struct FormEditor<D: DataProvider> {
// Autocomplete suggestions (library manages UI, user provides data) // Autocomplete suggestions (library manages UI, user provides data)
pub(crate) suggestions: Vec<SuggestionItem>, pub(crate) suggestions: Vec<SuggestionItem>,
#[cfg(feature = "validation")]
external_validation_callback: Option<Box<dyn FnMut(usize, &str) + Send + Sync>>,
} }
impl<D: DataProvider> FormEditor<D> { impl<D: DataProvider> FormEditor<D> {
@@ -33,7 +36,6 @@ impl<D: DataProvider> FormEditor<D> {
} }
/// Convert a byte index to a char index in a string /// Convert a byte index to a char index in a string
#[allow(dead_code)]
fn byte_to_char_index(s: &str, byte_idx: usize) -> usize { fn byte_to_char_index(s: &str, byte_idx: usize) -> usize {
s[..byte_idx].chars().count() s[..byte_idx].chars().count()
} }
@@ -42,6 +44,8 @@ impl<D: DataProvider> FormEditor<D> {
ui_state: EditorState::new(), ui_state: EditorState::new(),
data_provider, data_provider,
suggestions: Vec::new(), suggestions: Vec::new(),
#[cfg(feature = "validation")]
external_validation_callback: None,
}; };
// Initialize validation configurations if validation feature is enabled // Initialize validation configurations if validation feature is enabled
@@ -53,6 +57,17 @@ impl<D: DataProvider> FormEditor<D> {
editor editor
} }
/// Convert a char index to a byte index in a string
fn current_text(&self) -> &str {
// Convenience wrapper, kept for compatibility with existing code
let field_index = self.ui_state.current_field;
if field_index < self.data_provider.field_count() {
self.data_provider.field_value(field_index)
} else {
""
}
}
/// Compute inline completion for current selection and current text. /// Compute inline completion for current selection and current text.
fn compute_current_completion(&self) -> Option<String> { fn compute_current_completion(&self) -> Option<String> {
let typed = self.current_text(); let typed = self.current_text();
@@ -106,22 +121,11 @@ impl<D: DataProvider> FormEditor<D> {
self.ui_state.is_suggestions_active() self.ui_state.is_suggestions_active()
} }
/// Get current field text (convenience method)
pub fn current_text(&self) -> &str {
let field_index = self.ui_state.current_field;
if field_index < self.data_provider.field_count() {
self.data_provider.field_value(field_index)
} else {
""
}
}
/// Get current field text for display. /// Get current field text for display.
/// ///
/// Policies: /// Policies:
/// - Feature 4 (custom formatter): /// - Feature 4 (custom formatter):
/// - While editing the focused field: ALWAYS show raw (no custom formatting). /// - While editing the focused field: ALWAYS show raw (no custom formatting).
/// - When not editing the field: show formatted (fallback to raw on error).
/// - Mask-only fields: mask applies even in Edit mode (preserve legacy behavior). /// - Mask-only fields: mask applies even in Edit mode (preserve legacy behavior).
/// - Otherwise: raw. /// - Otherwise: raw.
#[cfg(feature = "validation")] #[cfg(feature = "validation")]
@@ -193,18 +197,26 @@ impl<D: DataProvider> FormEditor<D> {
.set_external_validation(field_index, state); .set_external_validation(field_index, state);
} }
/// Clear external validation state for a field (Feature 5) /// Clear external validation state for a specific field
#[cfg(feature = "validation")] #[cfg(feature = "validation")]
pub fn clear_external_validation(&mut self, field_index: usize) { pub fn clear_external_validation(&mut self, field_index: usize) {
self.ui_state.validation.clear_external_validation(field_index); self.ui_state.validation.clear_external_validation(field_index);
} }
/// Set external validation callback (Feature 5)
#[cfg(feature = "validation")]
pub fn set_external_validation_callback<F>(&mut self, callback: F)
where
F: FnMut(usize, &str) + Send + Sync + 'static,
{
self.external_validation_callback = Some(Box::new(callback));
}
/// Get effective display text for any field index. /// Get effective display text for any field index.
/// ///
/// Policies: /// Policies:
/// - Feature 4 fields (with custom formatter): /// - Feature 4 fields (with custom formatter):
/// - If the field is currently focused AND in Edit mode: return raw (no formatting). /// - If the field is currently focused AND in Edit mode: return raw (no formatting).
/// - Otherwise: return formatted (fallback to raw on error).
/// - Mask-only fields: mask applies regardless of mode (legacy behavior). /// - Mask-only fields: mask applies regardless of mode (legacy behavior).
/// - Otherwise: raw. /// - Otherwise: raw.
#[cfg(feature = "validation")] #[cfg(feature = "validation")]
@@ -279,254 +291,206 @@ impl<D: DataProvider> FormEditor<D> {
// SYNC OPERATIONS: No async needed for basic editing // SYNC OPERATIONS: No async needed for basic editing
// =================================================================== // ===================================================================
/// Handle character insertion with proper mask/limit coordination /// Centralized field transition logic
pub fn insert_char(&mut self, ch: char) -> Result<()> { #[cfg_attr(not(feature = "validation"), allow(unused_variables))]
if self.ui_state.current_mode != AppMode::Edit { pub fn transition_to_field(&mut self, new_field: usize) -> Result<()> {
return Ok(()); // Ignore in non-edit modes
}
let field_index = self.ui_state.current_field;
let raw_cursor_pos = self.ui_state.cursor_pos;
let current_raw_text = self.data_provider.field_value(field_index);
// 🔥 CRITICAL FIX 1: Check mask constraints FIRST
#[cfg(feature = "validation")]
{
if let Some(cfg) = self.ui_state.validation.get_field_config(field_index) {
if let Some(mask) = &cfg.display_mask {
// Get display cursor position
let display_cursor_pos = mask.raw_pos_to_display_pos(raw_cursor_pos);
// ❌ PREVENT BUG: Reject input if cursor is beyond mask pattern
if display_cursor_pos >= mask.pattern().len() {
tracing::debug!(
"Character insertion rejected: cursor beyond mask pattern length"
);
return Ok(()); // Silently reject - user can't type beyond mask
}
// ❌ PREVENT BUG: Reject input if cursor is on a separator position
if !mask.is_input_position(display_cursor_pos) {
tracing::debug!(
"Character insertion rejected: cursor on separator position {}",
display_cursor_pos
);
return Ok(()); // Silently reject - can't type on separators
}
// ❌ PREVENT BUG: Check if we're at max input positions for this mask
let input_char_count = (0..mask.pattern().len())
.filter(|&pos| mask.is_input_position(pos))
.count();
if current_raw_text.len() >= input_char_count {
tracing::debug!(
"Character insertion rejected: mask pattern full ({} input positions)",
input_char_count
);
return Ok(()); // Silently reject - mask is full
}
}
}
}
// 🔥 CRITICAL FIX 2: Validate character insertion with mask awareness
#[cfg(feature = "validation")]
{
let validation_result = self.ui_state.validation.validate_char_insertion(
field_index,
current_raw_text,
raw_cursor_pos,
ch,
);
// Reject input if validation failed with error
if !validation_result.is_acceptable() {
tracing::debug!(
"Character insertion rejected for field {}: {:?}",
field_index,
validation_result
);
return Ok(()); // Silently reject invalid input
}
}
// 🔥 CRITICAL FIX 3: Validate the insertion won't break display/limit coordination
let new_raw_text = {
let mut temp = current_raw_text.to_string();
let byte_pos = Self::char_to_byte_index(current_raw_text, raw_cursor_pos);
temp.insert(byte_pos, ch);
temp
};
#[cfg(feature = "validation")]
{
if let Some(cfg) = self.ui_state.validation.get_field_config(field_index) {
// Check character limits on the new raw text
if let Some(limits) = &cfg.character_limits {
if let Some(result) = limits.validate_content(&new_raw_text) {
if !result.is_acceptable() {
tracing::debug!(
"Character insertion rejected: would exceed character limits"
);
return Ok(()); // Silently reject - would exceed limits
}
}
}
// Check that mask can handle the new raw text length
if let Some(mask) = &cfg.display_mask {
let input_positions = (0..mask.pattern().len())
.filter(|&pos| mask.is_input_position(pos))
.count();
if new_raw_text.len() > input_positions {
tracing::debug!(
"Character insertion rejected: raw text length {} exceeds mask input positions {}",
new_raw_text.len(),
input_positions
);
return Ok(()); // Silently reject - mask can't handle this length
}
}
}
}
// ✅ ALL CHECKS PASSED: Safe to insert character
self.data_provider.set_field_value(field_index, new_raw_text);
// 🔥 CRITICAL FIX 4: Update cursor position correctly for mask context
#[cfg(feature = "validation")]
{
if let Some(cfg) = self.ui_state.validation.get_field_config(field_index) {
if let Some(mask) = &cfg.display_mask {
// Move to next input position, skipping separators
let new_raw_pos = raw_cursor_pos + 1;
let display_pos = mask.raw_pos_to_display_pos(new_raw_pos);
let next_input_pos = mask.next_input_position(display_pos);
let next_raw_pos = mask.display_pos_to_raw_pos(next_input_pos);
self.ui_state.cursor_pos = next_raw_pos;
self.ui_state.ideal_cursor_column = next_raw_pos;
return Ok(());
}
}
}
// No mask: simple increment
self.ui_state.cursor_pos = raw_cursor_pos + 1;
self.ui_state.ideal_cursor_column = self.ui_state.cursor_pos;
Ok(())
}
/// Handle cursor movement left - skips mask separator positions
pub fn move_left(&mut self) {
if self.ui_state.cursor_pos == 0 {
return;
}
let field_index = self.ui_state.current_field;
let mut new_pos = self.ui_state.cursor_pos - 1;
// Skip mask separator positions if configured
#[cfg(feature = "validation")]
if let Some(cfg) = self.ui_state.validation.get_field_config(field_index) {
if let Some(mask) = &cfg.display_mask {
// Convert to display position, find previous input position, convert back
let display_pos = mask.raw_pos_to_display_pos(new_pos);
if let Some(prev_input_display_pos) = mask.prev_input_position(display_pos) {
new_pos = mask.display_pos_to_raw_pos(prev_input_display_pos);
}
}
}
self.ui_state.cursor_pos = new_pos;
self.ui_state.ideal_cursor_column = self.ui_state.cursor_pos;
}
/// Handle cursor movement right - skips mask separator positions
pub fn move_right(&mut self) {
let current_text = self.current_text();
let is_edit_mode = self.ui_state.current_mode == AppMode::Edit;
let max_pos = if is_edit_mode {
current_text.len()
} else {
current_text.len().saturating_sub(1)
};
if self.ui_state.cursor_pos >= max_pos {
return;
}
let field_index = self.ui_state.current_field;
let mut new_pos = self.ui_state.cursor_pos + 1;
// Skip mask separator positions if configured
#[cfg(feature = "validation")]
if let Some(cfg) = self.ui_state.validation.get_field_config(field_index) {
if let Some(mask) = &cfg.display_mask {
// Convert to display position, find next input position, convert back
let display_pos = mask.raw_pos_to_display_pos(new_pos);
let next_input_display_pos = mask.next_input_position(display_pos);
new_pos = mask.display_pos_to_raw_pos(next_input_display_pos);
new_pos = new_pos.min(max_pos);
}
}
if new_pos <= max_pos {
self.ui_state.cursor_pos = new_pos;
self.ui_state.ideal_cursor_column = self.ui_state.cursor_pos;
}
}
/// Handle field navigation
pub fn move_to_next_field(&mut self) -> Result<()> {
let field_count = self.data_provider.field_count(); let field_count = self.data_provider.field_count();
if field_count == 0 { if field_count == 0 {
return Ok(()); return Ok(());
} }
// Check if field switching is allowed (minimum character enforcement) let prev_field = self.ui_state.current_field;
// 1. Bounds check
let mut target_field = new_field.min(field_count - 1);
// 2. Computed field skipping
#[cfg(feature = "computed")]
{
if let Some(computed_state) = &self.ui_state.computed {
if computed_state.is_computed_field(target_field) {
// Determine direction and search for nearest non-computed field
if target_field >= prev_field {
// Moving down: search forward
for i in (target_field + 1)..field_count {
if !computed_state.is_computed_field(i) {
target_field = i;
break;
}
}
} else {
// Moving up: search backward
let mut i = target_field;
loop {
if !computed_state.is_computed_field(i) {
target_field = i;
break;
}
if i == 0 {
break;
}
i -= 1;
}
}
}
}
}
// 3. Blocking validation before leaving current field
#[cfg(feature = "validation")] #[cfg(feature = "validation")]
{ {
let current_text = self.current_text(); let current_text = self.current_text();
if !self.ui_state.validation.allows_field_switch(self.ui_state.current_field, current_text) { if !self.ui_state.validation.allows_field_switch(prev_field, current_text) {
if let Some(reason) = self.ui_state.validation.field_switch_block_reason( if let Some(reason) = self
self.ui_state.current_field, .ui_state
current_text .validation
) { .field_switch_block_reason(prev_field, current_text)
{
tracing::debug!("Field switch blocked: {}", reason); tracing::debug!("Field switch blocked: {}", reason);
return Err(anyhow::anyhow!("Cannot switch fields: {}", reason)); return Err(anyhow::anyhow!("Cannot switch fields: {}", reason));
} }
} }
} }
// Validate current field before moving // 4. Exit hook for current field (content validation + external validation trigger)
#[cfg(feature = "validation")] #[cfg(feature = "validation")]
{ {
let current_text = self.current_text().to_string(); let text = self.data_provider.field_value(prev_field).to_string();
let _validation_result = self.ui_state.validation.validate_field_content( let _ = self
self.ui_state.current_field, .ui_state
&current_text, .validation
); .validate_field_content(prev_field, &text);
if let Some(cfg) = self.ui_state.validation.get_field_config(prev_field) {
// If external validation is enabled for this field and there is content
if cfg.external_validation_enabled && !text.is_empty() {
// Trigger external validation state
self.set_external_validation(prev_field, crate::validation::ExternalValidationState::Validating);
// Invoke external callback if registered
if let Some(cb) = self.external_validation_callback.as_mut() {
cb(prev_field, &text);
}
}
}
} }
let next_field = (self.ui_state.current_field + 1) % field_count; #[cfg(feature = "computed")]
self.ui_state.move_to_field(next_field, field_count); {
// Placeholder for recompute hook if needed (requires provider)
// Could call on_field_changed with a provider when available.
}
// Clamp cursor to new field // 5. Move to new field
self.ui_state.move_to_field(target_field, field_count);
// 6. Clamp cursor to new field
let current_text = self.current_text(); let current_text = self.current_text();
let max_pos = current_text.len(); let max_pos = current_text.len();
self.ui_state.set_cursor( self.ui_state.set_cursor(
self.ui_state.ideal_cursor_column, self.ui_state.ideal_cursor_column,
max_pos, max_pos,
self.ui_state.current_mode == AppMode::Edit self.ui_state.current_mode == AppMode::Edit,
); );
Ok(()) Ok(())
} }
/// Move to previous field (vim k / up arrow)
pub fn move_up(&mut self) -> Result<()> {
let new_field = self.ui_state.current_field.saturating_sub(1);
self.transition_to_field(new_field)
}
/// Move to next field (vim j / down arrow)
pub fn move_down(&mut self) -> Result<()> {
let new_field = (self.ui_state.current_field + 1).min(self.data_provider.field_count().saturating_sub(1));
self.transition_to_field(new_field)
}
/// Move to next field (vim j / down arrow)
pub fn move_to_next_field(&mut self) -> Result<()> {
let field_count = self.data_provider.field_count();
if field_count == 0 {
return Ok(());
}
let new_field = (self.ui_state.current_field + 1) % field_count;
self.transition_to_field(new_field)
}
/// Restore left and right movement within the current field
/// Move cursor left within current field
pub fn move_left(&mut self) -> Result<()> {
let mut moved = false;
// Try mask-aware movement if validation/mask config exists
#[cfg(feature = "validation")]
{
let field_index = self.ui_state.current_field;
if let Some(cfg) = self.ui_state.validation.get_field_config(field_index) {
if let Some(mask) = &cfg.display_mask {
let display_pos = mask.raw_pos_to_display_pos(self.ui_state.cursor_pos);
if let Some(prev_display_pos) = mask.prev_input_position(display_pos) {
let raw_pos = mask.display_pos_to_raw_pos(prev_display_pos);
let max_pos = self.current_text().chars().count();
self.ui_state.cursor_pos = raw_pos.min(max_pos);
self.ui_state.ideal_cursor_column = self.ui_state.cursor_pos;
moved = true;
} else {
self.ui_state.cursor_pos = 0;
self.ui_state.ideal_cursor_column = 0;
moved = true;
}
}
}
}
if !moved {
// Fallback to simple left movement
if self.ui_state.cursor_pos > 0 {
self.ui_state.cursor_pos -= 1;
self.ui_state.ideal_cursor_column = self.ui_state.cursor_pos;
}
}
Ok(())
}
/// Move cursor right within current field
pub fn move_right(&mut self) -> Result<()> {
let mut moved = false;
let field_index = self.ui_state.current_field;
// Try mask-aware movement if mask is configured for this field
#[cfg(feature = "validation")]
{
if let Some(cfg) = self.ui_state.validation.get_field_config(field_index) {
if let Some(mask) = &cfg.display_mask {
let display_pos = mask.raw_pos_to_display_pos(self.ui_state.cursor_pos);
if let Some(next_display_pos) = mask.next_input_position(display_pos) {
let raw_pos = mask.display_pos_to_raw_pos(next_display_pos);
let max_pos = self.current_text().chars().count();
self.ui_state.cursor_pos = raw_pos.min(max_pos);
self.ui_state.ideal_cursor_column = self.ui_state.cursor_pos;
moved = true;
} else {
// Move to end if there is no next input
let max_pos = self.current_text().chars().count();
self.ui_state.cursor_pos = max_pos;
self.ui_state.ideal_cursor_column = max_pos;
moved = true;
}
}
}
}
if !moved {
// Fallback to simple right movement
let max_pos = self.current_text().chars().count();
if self.ui_state.cursor_pos < max_pos {
self.ui_state.cursor_pos += 1;
self.ui_state.ideal_cursor_column = self.ui_state.cursor_pos;
}
}
Ok(())
}
/// Change mode (for vim compatibility) /// Change mode (for vim compatibility)
pub fn set_mode(&mut self, mode: AppMode) { pub fn set_mode(&mut self, mode: AppMode) {
match (self.ui_state.current_mode, mode) { match (self.ui_state.current_mode, mode) {
@@ -733,178 +697,24 @@ impl<D: DataProvider> FormEditor<D> {
// =================================================================== // ===================================================================
/// Move to previous field (vim k / up arrow) /// Move to previous field (vim k / up arrow)
pub fn move_up(&mut self) -> Result<()> { pub fn move_up_only(&mut self) -> Result<()> {
let field_count = self.data_provider.field_count(); self.move_up()
if field_count == 0 {
return Ok(());
}
// Skip computed fields during navigation when feature enabled
#[cfg(feature = "computed")]
{
if let Some(computed_state) = &self.ui_state.computed {
// Find previous non-computed field
let mut candidate = self.ui_state.current_field;
for _ in 0..field_count {
candidate = candidate.saturating_sub(1);
if !computed_state.is_computed_field(candidate) {
// Validate and move as usual
#[cfg(feature = "validation")]
{
let current_text = self.current_text();
if !self.ui_state.validation.allows_field_switch(self.ui_state.current_field, current_text) {
if let Some(reason) = self.ui_state.validation.field_switch_block_reason(self.ui_state.current_field, current_text) {
tracing::debug!("Field switch blocked: {}", reason);
return Err(anyhow::anyhow!("Cannot switch fields: {}", reason));
}
}
}
#[cfg(feature = "validation")]
{
let current_text = self.current_text().to_string();
let _validation_result = self.ui_state.validation.validate_field_content(
self.ui_state.current_field,
&current_text,
);
}
self.ui_state.move_to_field(candidate, field_count);
self.clamp_cursor_to_current_field();
return Ok(());
}
if candidate == 0 {
break;
}
}
}
}
// Check if field switching is allowed (minimum character enforcement)
#[cfg(feature = "validation")]
{
let current_text = self.current_text();
if !self.ui_state.validation.allows_field_switch(self.ui_state.current_field, current_text) {
if let Some(reason) = self.ui_state.validation.field_switch_block_reason(self.ui_state.current_field, current_text) {
tracing::debug!("Field switch blocked: {}", reason);
return Err(anyhow::anyhow!("Cannot switch fields: {}", reason));
}
}
}
// Validate current field before moving
#[cfg(feature = "validation")]
{
let current_text = self.current_text().to_string(); // Convert to String to avoid borrow conflicts
let _validation_result = self.ui_state.validation.validate_field_content(
self.ui_state.current_field,
&current_text,
);
}
let current_field = self.ui_state.current_field;
let new_field = current_field.saturating_sub(1);
self.ui_state.move_to_field(new_field, field_count);
self.clamp_cursor_to_current_field();
Ok(())
} }
/// Move to next field (vim j / down arrow) /// Move to next field (vim j / down arrow)
pub fn move_down(&mut self) -> Result<()> { pub fn move_down_only(&mut self) -> Result<()> {
let field_count = self.data_provider.field_count(); self.move_down()
if field_count == 0 {
return Ok(());
} }
// Skip computed fields during navigation when feature enabled /// Move to first line (vim gg)
#[cfg(feature = "computed")] pub fn move_first_line(&mut self) -> Result<()> {
{ self.transition_to_field(0)
if let Some(computed_state) = &self.ui_state.computed {
// Find next non-computed field
let mut candidate = self.ui_state.current_field;
for _ in 0..field_count {
candidate = (candidate + 1).min(field_count - 1);
if !computed_state.is_computed_field(candidate) {
// Validate and move as usual
#[cfg(feature = "validation")]
{
let current_text = self.current_text();
if !self.ui_state.validation.allows_field_switch(self.ui_state.current_field, current_text) {
if let Some(reason) = self.ui_state.validation.field_switch_block_reason(self.ui_state.current_field, current_text) {
tracing::debug!("Field switch blocked: {}", reason);
return Err(anyhow::anyhow!("Cannot switch fields: {}", reason));
}
}
}
#[cfg(feature = "validation")]
{
let current_text = self.current_text().to_string();
let _validation_result = self.ui_state.validation.validate_field_content(
self.ui_state.current_field,
&current_text,
);
}
self.ui_state.move_to_field(candidate, field_count);
self.clamp_cursor_to_current_field();
return Ok(());
}
if candidate == field_count - 1 {
break;
}
}
}
} }
// Check if field switching is allowed (minimum character enforcement) /// Move to last line (vim G)
#[cfg(feature = "validation")] pub fn move_last_line(&mut self) -> Result<()> {
{ let last_field = self.data_provider.field_count().saturating_sub(1);
let current_text = self.current_text(); self.transition_to_field(last_field)
if !self.ui_state.validation.allows_field_switch(self.ui_state.current_field, current_text) {
if let Some(reason) = self.ui_state.validation.field_switch_block_reason(self.ui_state.current_field, current_text) {
tracing::debug!("Field switch blocked: {}", reason);
return Err(anyhow::anyhow!("Cannot switch fields: {}", reason));
}
}
}
// Validate current field before moving
#[cfg(feature = "validation")]
{
let current_text = self.current_text().to_string(); // Convert to String to avoid borrow conflicts
let _validation_result = self.ui_state.validation.validate_field_content(
self.ui_state.current_field,
&current_text,
);
}
let current_field = self.ui_state.current_field;
let new_field = (current_field + 1).min(field_count - 1);
self.ui_state.move_to_field(new_field, field_count);
self.clamp_cursor_to_current_field();
Ok(())
}
/// Move to first field (vim gg)
pub fn move_first_line(&mut self) {
let field_count = self.data_provider.field_count();
if field_count == 0 {
return;
}
self.ui_state.move_to_field(0, field_count);
self.clamp_cursor_to_current_field();
}
/// Move to last field (vim G)
pub fn move_last_line(&mut self) {
let field_count = self.data_provider.field_count();
if field_count == 0 {
return;
}
let last_field = field_count - 1;
self.ui_state.move_to_field(last_field, field_count);
self.clamp_cursor_to_current_field();
} }
/// Move to previous field (alternative to move_up) /// Move to previous field (alternative to move_up)