Substring(s) of an ANSI colored string

This is a color-aware counterpart of base::substr(). It works exactly like the original, but keeps the colors in the substrings. The ANSI escape sequences are ignored when calculating the positions within the string.

ansi_substr(x, start, stop)

Arguments

x	Character vector, potentially ANSI styled, or a vector to coarced to character.
start	Starting index or indices, recycled to match the length of x.
stop	Ending index or indices, recycled to match the length of x.

Value

Character vector of the same length as x, containing the requested substrings. ANSI styles are retained.

See also

Other ANSI string operations: ansi_align(), ansi_columns(), ansi_nchar(), ansi_strsplit(), ansi_strtrim(), ansi_strwrap(), ansi_substring(), ansi_toupper(), ansi_trimws()

Examples

str <- paste(
  col_red("red"),
  "default",
  col_green("green")
)

cat(str, "\n")
#> red default green 
cat(ansi_substr(str, 1, 5), "\n")
#> red d 
cat(ansi_substr(str, 1, 15), "\n")
#> red default gre 
cat(ansi_substr(str, 3, 7), "\n")
#> d def 

substr(ansi_strip(str), 1, 5)
#> [1] "red d"
substr(ansi_strip(str), 1, 15)
#> [1] "red default gre"
substr(ansi_strip(str), 3, 7)
#> [1] "d def"

str2 <- paste(
  "another",
  col_red("multi-", style_underline("style")),
  "text"
)

cat(str2, "\n")
#> another multi-style text 
cat(ansi_substr(c(str, str2), c(3,5), c(7, 18)), sep = "\n")
#> d def
#> her multi-styl
substr(ansi_strip(c(str, str2)), c(3,5), c(7, 18))
#> [1] "d def"          "her multi-styl"