69 lines
2.3 KiB
Markdown
69 lines
2.3 KiB
Markdown
# Autojump from tabstop when it's empty
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UltiSnips offers enough API to support automatic jump from one tabstop to
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another when some condition is encountered.
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One example of applying that behaviour is jump on the next placeholder when
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current becomes empty when user types `<BS>` or another erase sequence when
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tabstop is active.
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Let's imagine, that we have following snippet:
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First placeholder, surrounded by braces, can be erased by user, but then
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surrounding quotes will left untouched, and user should remove quotes and
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one space, and only then jump to next placeholder, that equals to **5** total
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keypresses: <kbd>BackSpace</kbd> (erase placeholder), <kbd>BackSpace</kbd> and
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<kbd>Delete</kbd> (erase braces), <kbd>Delete</kbd> (erase space),
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<kbd>Ctrl+J</kbd> (jump to next placeholder).
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However, with UltiSnips, it can be done via only one keypress:
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<kbd>BackSpace</kbd>:
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## Implementation
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Using awesome [vim-pythonx
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library](https://github.com/reconquest/vim-pythonx/blob/master/pythonx/px/snippets.py),
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which provides set of functions to make coding little bit easier.
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```
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global !p
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import px.snippets
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endglobal
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global !p
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# This function will jump to next placeholder when first is empty.
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def jump_to_second_when_first_is_empty(snip):
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if px.snippets.get_jumper_position(snip) == 1:
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if not px.snippets.get_jumper_text(snip):
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px.snippets.advance_jumper(snip)
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# This function will clean up first placeholder when this is empty.
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def clean_first_placeholder(snip):
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# Jumper is a helper for performing jumps in UltiSnips.
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px.snippets.make_jumper(snip)
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if snip.tabstop == 2:
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line = snip.buffer[snip.cursor[0]]
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snip.buffer[snip.cursor[0]] = \
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line[:snip.tabstops[1].start[1]-2] + \
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line[snip.tabstops[1].end[1]+1:]
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snip.cursor.set(
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snip.cursor[0],
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snip.cursor[1] - 3,
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)
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endglobal
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context "px.snippets.make_context(snip)"
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post_jump "clean_first_placeholder(snip)"
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snippet x "Description" b
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`!p jump_to_second_when_first_is_empty(snip)
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`func (${1:blah}) $2() {
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$3
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}
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endsnippet
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```
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