returnCommandArg: returnCommandArg
In tmcd82070/tex2rmd: Latex to Rmd Conversion

Description Usage Arguments Details Value Examples

Return an argument of a Tex command.

1	returnCommandArg(x, cmd, argNum = 1, optArg = FALSE)

`x`	An array of character strings (lines from a Latex file) to process.
`cmd`	A character string naming the command to look for in `x`. This is the command, without the "\". `cmd` is simply pasted to the end of two slashes "\" and the results becomves a regular expression. Hence, regular expressions like "(ref\|label)" will return arguments for the first \ref or \label command in `x`. `cmd` = "[0-9]" will return arguments of any command with a number in it. Etc.
`argNum`	The number of the argument to `cmd` that is desired.
`optArg`	True or false depending on whether one of the optional arguments or one of the required arguments is desired.

Tex command is something like "\comand[opt1]arg1arg2", and this routine returns one of those arguments, either optional or required.

The desired argument as a single text string. If the command does not exist in x, a string of length 0 (i.e., "") is returned. If the requested argument does not exist (e.g., argNum too big), a string of length 0 (i.e., "") is returned.

x <- c("kdkdk", "kdkd  \\title{My Title", "is Sir} dkdk")
returnCommandArg(x, "title")

x <- c("\\cmd[opt1][opt2]{arg1}{arg2}")
returnCommandArg(x, "cmd", 1)  # "arg1"
returnCommandArg(x, "cmd", 2)  # "arg2"
returnCommandArg(x, "cmd", 1, TRUE)  # "opt1"
returnCommandArg(x, "cmd", 2, TRUE)  # "opt2"