qqcat: Print a string which has been intepolated with variables

In GetoptLong: Parsing Command-Line Arguments and Simple Variable Interpolation

Description

Print a string which has been intepolated with variables

Usage

qqcat(..., envir = parent.frame(), code.pattern = NULL, file = "",
    sep = " ", fill = FALSE, labels = NULL, append = FALSE, cat_prefix = NULL,
    strwrap = qq.options("cat_strwrap"), strwrap_param = list(), sep2 = "")

Arguments

...	text string in which variables are marked with certain rules
envir	environment where to look for those variables
code.pattern	pattern of marks for the variables
file	pass to cat
sep	pass to cat
fill	pass to cat
labels	pass to cat
append	pass to cat
cat_prefix	prefix string. It is prior than qq.options(cat_prefix).
strwrap	whether call strwrap to wrap the string
strwrap_param	parameters sent to strwrap, must be a list
sep2	Separation character when there are multiple templates.

Details

This function is a shortcut of

    cat(qq(text, envir, code.pattern), ...)  

Additionally, you can add global prefix:

    qq.options("cat_prefix" = "[INFO] ")
    qq.options("cat_prefix" = function(x) format(Sys.time(), "[%Y-%m-%d %H:%M:%S] "))
    qq.options("cat_prefix" = NULL)  

You can also add local prefix by specifying cat_prefix in qqcat.

    qqcat(text, cat_prefix = "[INFO] ")  

Please refer to qq to find more details.

Author(s)

Zuguang Gu <[e-mail]>

Examples

a = 1
b = "text"
qqcat("a = @{a}, b = '@{b}'\n")
qqcat("a = `a`, b = '`b`'\n", code.pattern = "`CODE`")

qq.options("cat_prefix" = function(x) format(Sys.time(), "[%Y-%m-%d %H:%M:%S] "))
qqcat("a = @{a}, b = '@{b}'\n")
Sys.sleep(2)
qqcat("a = @{a}, b = '@{b}'\n")
qq.options(RESET = TRUE)

GetoptLong documentation built on Jan. 8, 2021, 2:29 a.m.