This is for fixing up "untrusted text" that is to be passed into a file as content. It protects against "bad" text strings in 3 contexts, 1) LaTeX documents, 2) HTML documents, or 3) text in a file name. It converts content text to an improved string that will not cause failures in the eventual document.
a string, or vector of strings (each of which is processed separately)
"tex" is default, could be "filename" or "html"
The special in-document LaTeX symbols like percent sign or dollar sign are "%" and "\$". *Warning*: In the R session, these will appear as double-backslashed symbols, while in a saved text file, there will only be the one desired slash.
If type = "html", we only clean up <, >, / and &, and quote characters. If document is in unicode, we don't need to do the gigantic set anymore.
If type = "filename", then symbols that are not allowed in file names, such as "\", "*", are replaced. Do not use this on a full path, since it will obliterate path separators.
corrected character vector
Paul Johnson <email@example.com>
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