Find a GhostScript executable in a cross-platform way.
find_gs_cmd(gs_cmd = "")
The name, full or partial path of a GhostScript executable.
The details differ by platform.
On a Unix-alike, the GhostScript executable is usually called
gs. The name (and possibly path) of the command is taken
first from argument
gs_cmd then from the environment variable
R_GSCMD and default
gs. This is then looked for on the
system path and the value returned if a match is found.
On Windows, the name of the command is taken from argument
gs_cmd then from the environment variables R_GSCMD and
GSC. If neither of those produces a suitable command name,
gswin32c are tried in turn. In all
cases the command is looked for on the system PATH.
Note that on Windows (and some other OSes) there are separate GhostScript executables to display Postscript/PDF files and to manipulate them: this function looks for the latter.
A character string giving the full path to a GhostScript executable if one was found, otherwise an empty string.
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