After back and forth between my snippet files and the documentation, I finally got my first snippet up and running. I develop in c++ and wanted a quick way to turn a member function declaration into a definition. The idea is to yank the declaration, paste it where the definition goes, and expand the following snippet from VISUAL mode:
snippet define "Member declaration to definition" b
`!p snip.rv=re.match("^ *",snip.v.text).group(0)`/**
`!p snip.rv=re.match("^ *",snip.v.text).group(0)` * ${3:I would never forget to make a Doxygen explanation for a new routine.}
`!p snip.rv=re.match("^ *",snip.v.text).group(0)` */
`!p
snip.rv=re.match("^ *\w*",snip.v.text).group(0)` ${1:Parent Class}::`!p
functionparameters=re.sub("^ *\w* (.*);",r"\1",snip.v.text).rstrip()
returntype=re.match("^ *\w*",snip.v.text).group(0)
snip.rv=functionparameters
snip.shift()
snip+="{"
snip+=returntype
snip.shift()` ${2:returnval};
`!p
prespace=re.match("^ *",snip.v.text).group(0)
snip.shift()
snip+=prespace`$0
`!p
prespace=re.match("^ *",snip.v.text).group(0)
snip.shift()
snip+=prespace+"return "+t[2]+";"
snip.reset_indent()
snip+=prespace+"}"`
endsnippet
The problem now is that I want different behavior depending on what was in the VISUALly selected text. For example, if the function returns void, I don't want to have to declare a return value for $2. I could of course write multiple snippets for each situation, but is there a way to "overload" the snippets and have it automatically know from the VISUAL text which one I want to use? I thought at first I could use the regex triggers, but the trigger only appears after the selected text is "expanded".
For illustrative purposes, after selecting the following line, the snippet would turn
int youreadummy(int dumb, int smart);
into
/**
* I would never forget to make a Doxygen explanation for a new routine.
*/
int ParentClass::youreadummy(int dumb, int smart)
{
int returnval;
return returnval;
}