51 lines
1.6 KiB
Markdown
51 lines
1.6 KiB
Markdown
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# Dynamic tabstop generation
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UltiSnips at the present day is more than snippet engine. It's more like
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constructor, where you can implement some complex features without prior
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feature implementation in the snippet by itself.
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One of that features is dynamic tabstop generation.
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Consider case, where you want set of snippets for inserting latex rows of
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various lengths. No-brainer solution is just implement snippet for every
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row length you're possible will want, like this:
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```
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snippet tr9 "LaTeX table row of length nine"
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$1 & $2 & $3 & $4 & $5 & $6 & $7 & $8 & $9
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endsnippet
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```
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But soon it becomes a burden to maintain that kind of snippets.
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Gladly, tabstops can be generated by using anonymous snippet expansion:
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```
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global !p
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def create_row_placeholders(snip):
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# retrieving singlee line from current string and treat it like tabstops
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# count
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placeholders_amount = int(snip.buffer[snip.line].strip())
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# erase current line
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snip.buffer[snip.line] = ''
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# create anonymous snippet with expected content and number of tabstops
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anon_snippet_body = ' & '.join(['$' + str(i+1)
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for i in range(placeholders_amount)])
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# expand anonymous snippet
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snip.expand_anon(anon_snippet_body)
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endglobal
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post_jump "create_row_placeholders(snip)"
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snippet "tr(\d+)" "latex table row variable" br
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`!p snip.rv = match.group(1)`
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endsnippet
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```
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Snippet is declared via regular expression and will expand to any required
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number of fields in row.
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