Block-based navigation in Vim

block-based-nav.vim

" {{{ python: block-based navigation

if has("python")
" pyblock.vim
"au FileType python map ( :python move_same_indent(-1)<enter>
"au FileType python map ) :python move_same_indent(1)<enter>
"au FileType python map { :python move_outer_indent(-1)<enter>
"au FileType python map } :python move_outer_indent(1)<enter>

python << EOF
def count_indent(line):
    import vim
    i = 0
    tab_width = int(vim.eval("&tabstop"))
    for s in line:
        if s == ' ':
            i += 1
        elif s == '\t':
            i += tab_width
        else:
            return i

    return 0

def move_by_indent(end_pred, direction):
    import vim

    buf = vim.current.buffer
    row, col = vim.current.window.cursor
    row -= 1
    start_indent = count_indent(buf[row])

    while True:
        row += direction

        # bail if we hit the end
        if row < 0 or row >= len(buf):
            break

        # skip over empty lines
        if not buf[row].strip():
            continue

        if end_pred(count_indent(buf[row]), start_indent):
            break

    row = max(0, min(len(buf)-1, row))

    vim.current.window.cursor = row+1, col



def move_same_indent(direction):
    move_by_indent(
      lambda indent, s_indent: indent <= s_indent,
      direction)



def move_outer_indent(direction):
    move_by_indent(
      lambda indent, s_indent: indent < s_indent,
      direction)
EOF
endif

" }}}