Hi Kiichi and Bram,
2016/7/22 Fri 3:54:18 UTC+9 Bram Moolenaar wrote:
> Ozaki Kiichi wrote:
>
> > > > I propose new conversion specifier '%v' (and '%V') of printf();
> > > > inspired by golang.
> > > >
> > > > This spec takes a value of any type and converts into string by
> > > > echo_string().
> > > >
> > > > example:
> > > >
> > > > " list
> > > > :echo printf('%v', [0, 1, 2, 3])
> > > > [0, 1, 2, 3]
> > > >
> > > > " dict
> > > > :echo printf('%v', {'str' : 'abcdef', 'num' : 123, 'pt' :
> > > > function('printf', ['%%'])})
> > > > {'str': 'abcdef', 'num': 123, 'pt': function('printf', ['%%'])}
> > > >
> > > > " funcref
> > > > :echo printf('%v', function('str2nr'))
> > > > str2nr
> > > >
> > > >
> > > > '%V' is simular with '%S'.
> > > >
> > > > patch:
> > > >
> > > > https://gist.github.com/ichizok/c1ad7759d7a0a0734fb02f5a4d37445c
> > >
> > >
> > > So, the same would be done with using "%s" and string() on the value?
> > >
> > > :echo printf('%s', string([0, 1, 2, 3]))
> > > [0, 1, 2, 3]
> > >
> > > I suppose golang doesn't have a string() function.
> > >
> > > An even simpler way is to do what Swift does:
> > >
> > > "lead \(expression) tail"
> > >
> > > With the example above:
> > > "\([0, 1, 2, 3])"
> > >
> > > I'm using this in Zimbu, works quite well.
> >
> > When converting multiple values of any types (e.g. in debugging),
> > it is rather bothersome to use string() to each values:
> >
> > :echo printf('foo: %s, bar: %s, baz: %s, qux: %s', string(foo),
> > string(bar), string(baz), string(qux))
> >
> > and, when a argument is string, string() is redundant.
> >
> > Thus, simply:
> >
> > :echo printf('foo: %v, bar: %v, baz: %v, qux: %v', foo, bar, baz, qux)
> >
> > It is easy to reuse format string.
> >
> > let fmt = '[%v] [%v] [%v]'
> > ...
> > echo printf(fmt, x1, x2, x3)
> > ...
> > echo printf(fmt, y1, y2, y3)
>
> Well, since currently this produces an error, we could just convert to a
> string when using "%s".
Then how about this patch?
https://bitbucket.org/k_takata/vim-ktakata-mq/src/9963788ec24a00f70f232af8bf944b85cfda8c15/enhance-printf-s.patch?at=default
Regards,
Ken Takata
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