On Sun, 5 Feb 2017, Rogers, Michael K wrote:
Let's say I want a link to plot x+2 in Wolfram|Alpha. I need to catenate
"http://www.wolframalpha.com/input/?i="; and "plot+x%2B2". Is there any way already available in
ConTeXt to translate reserved characters like "+" to the percent-hexcode "%2B"?
Something like
\encode[plot x+2]
would become
plot+x%2B2
Or more generally, some languages have a query constructor like this
\queryURI
[http://www.wolframalpha.com/input]
[i=plot x+2]
which would construct the URI
http://www.wolframalpha.com/input/?i=plot+x%2B2
I could write my own, of course. But no need to reinvent the wheel.
url.escape does exactly that.
\startluacode
local base="http://www.wolframalpha.com/input";
local query="i=plot x+2"
local fullname = base .. query
print(url.escape(fullname))
\stopluacode
gives
http%3A//www.wolframalpha.com/inputi%3Dplot%20x%2B2
Also look at l-url.lua for other helper functions for parsing and
escaping/unescaping urls.
Aditya
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