Allow panderOptions() to specify a path to the binary

[ctoforaday]

It would be awesome if it were possible to specify a particular location for pandoc that isn't on the path.

Specifically, at

pander/R/convert.R

Line 119 in b48fc68

cmd <- sprintf('pandoc -f markdown -s %s %s -o %s', options, shQuote(f), shQuote(f.out))

we build the string we execute, with the name of the binary. Any chance of just allowing the user to specify it in panderOptions() and paste() the string together?

[daroczig]

Please test, and let me know if it works fine or results in some side-effects.

[ctoforaday]

Good change.

• Verified panderOptions() looks healthy, and correctly reports fq location of binary.
• Verified setting correctly and incorrectly.

Thanks, looks good.

Side effect will be that once Pander is loaded into R, changes to path will not affect the discovered binary until package reload. You may choose to leave the default as the non-specific, path-less 'pandoc' and leave the command to get its path evaluated at the moment of execution, but I don't really think that's necessary. It is a small change in behaviour, but it's unlikely to result in any confusion, IMO, given the difficulty of altering PATH from inside R.

[daroczig]

Thanks for your kind feedback!