def change_indent(cursor, direction):
"""Changes the indent in the desired direction (-1 for left and +1 for right).
Returns True if the indent operation was applied.
The cursor may contain a selection.
"""
# get some variables from the document
indent_vars = indent_variables(cursor.document())
blocks = list(cursortools.blocks(cursor))
block = blocks[0]
pos = cursor.selectionStart() - block.position()
token = tokeniter.tokens(block)[0] if tokeniter.tokens(block) else None
if cursor.hasSelection() or pos == 0 or (token and isinstance(token, ly.lex.Space) and token.end >= pos):
# decrease the indent
state = tokeniter.state(block)
current_indent = get_indent(block)
new_indent = current_indent + direction * indent_vars['indent-width']
if state.mode() in ('lilypond', 'scheme'):
computed_indent = compute_indent(block)
if cmp(computed_indent, new_indent) == direction:
new_indent = computed_indent
diff = new_indent - current_indent
with cursortools.compress_undo(cursor):
for block in blocks:
set_indent(block, get_indent(block) + diff)
return True
def re_indent(cursor):
"""Re-indents the selected region or the whole document."""
if cursor.hasSelection():
blocks = cursortools.blocks(cursor)
else:
blocks = cursortools.all_blocks(cursor.document())
with cursortools.compress_undo(cursor):
for block in blocks:
tokeniter.update(block)
if tokeniter.state(block).mode() in ('lilypond', 'scheme'):
indent = compute_indent(block)
else:
indent = get_indent(block)
if set_indent(block, indent):
tokeniter.update(block) # force token update if changed
def get_blocks(cursor):
"""Yields all or the selected blocks."""
if cursor.hasSelection():
return cursortools.blocks(cursor)
else:
return cursortools.all_blocks(cursor.document())
