Read INI (.ini file extension) configuration files.
Arguments
- file
The name and path of the INI configuration file.
- ...
Other arguments passed to the function (currently there is none).
Value
The configuration value a named list,
each element of the list being a section of the INI file.
Each element (section) containing the key-value pairs from the INI file.
When no value is provided in the file, the value is "".
By convention, all values returned by the function are of character type.
R expressions following !expr are evaluated according to the settings of
the R_RCONFIG_EVAL environment variable or the option "rconfig.eval".
Details
An INI configuration file consists of sections, each led by a [section] header,
followed by key/value entries separated by a specific string (= or : by default).
By default, section names are case sensitive but keys are not.
Leading and trailing whitespace is removed from keys and values.
Values can be omitted if the parser is configured to allow it,
in which case the key/value delimiter may also be left out.
Values can also span multiple lines, as long as they are indented deeper than the first line of the value.
Blank lines may be treated as parts of multiline values or ignored.
By default, a valid section name can be any string that does not contain \n or ].
Configuration files may include comments, prefixed by specific characters (# and ; by default).
Comments may appear on their own on an otherwise empty line, possibly indented.
Examples
inifile <- system.file("examples", "example.ini", package = "rconfig")
## not evaluating R expressions
op <- options("rconfig.eval" = FALSE)
ini <- rconfig::read_ini(file = inifile)
str(ini)
#> List of 7
#> $ Simple Values :List of 5
#> ..$ key : chr "value"
#> ..$ spaces in keys : chr "allowed"
#> ..$ spaces in values : chr "allowed as well"
#> ..$ spaces around the delimiter: chr "obviously"
#> ..$ you can also use : chr "to delimit keys from values"
#> $ All Values Are Strings :List of 5
#> ..$ values like this : int 1000000
#> ..$ or this : num 3.14
#> ..$ are they treated as numbers? : chr "no"
#> ..$ integers, floats and booleans are held as : chr "strings"
#> ..$ can use the API to get converted values directly: logi TRUE
#> $ Multiline Values :List of 1
#> ..$ chorus: chr [1:2] "I'm a lumberjack, and I'm okay" "I sleep all night and I work all day"
#> $ No Values :List of 2
#> ..$ key_without_value : chr ""
#> ..$ empty string value here: chr ""
#> $ You can use comments : list()
#> $ Sections Can Be Indented:List of 4
#> ..$ can_values_be_as_well : logi TRUE
#> ..$ does_that_mean_anything_special: logi FALSE
#> ..$ purpose : chr "formatting for readability"
#> ..$ multiline_values : chr [1:5] "are" "handled just fine as" "long as they are indented" "deeper than the first line" ...
#> $ R specific pieces :List of 4
#> ..$ trials : int 5
#> ..$ pi : num 3.14
#> ..$ dataset: chr "demo-data.csv"
#> ..$ cores : chr "!expr getOption(\"mc.cores\", 1L)"
## evaluating R expressions
options("rconfig.eval" = TRUE)
ini <- rconfig::read_ini(file = inifile)
str(ini)
#> List of 7
#> $ Simple Values :List of 5
#> ..$ key : chr "value"
#> ..$ spaces in keys : chr "allowed"
#> ..$ spaces in values : chr "allowed as well"
#> ..$ spaces around the delimiter: chr "obviously"
#> ..$ you can also use : chr "to delimit keys from values"
#> $ All Values Are Strings :List of 5
#> ..$ values like this : int 1000000
#> ..$ or this : num 3.14
#> ..$ are they treated as numbers? : chr "no"
#> ..$ integers, floats and booleans are held as : chr "strings"
#> ..$ can use the API to get converted values directly: logi TRUE
#> $ Multiline Values :List of 1
#> ..$ chorus: chr [1:2] "I'm a lumberjack, and I'm okay" "I sleep all night and I work all day"
#> $ No Values :List of 2
#> ..$ key_without_value : chr ""
#> ..$ empty string value here: chr ""
#> $ You can use comments : list()
#> $ Sections Can Be Indented:List of 4
#> ..$ can_values_be_as_well : logi TRUE
#> ..$ does_that_mean_anything_special: logi FALSE
#> ..$ purpose : chr "formatting for readability"
#> ..$ multiline_values : chr [1:5] "are" "handled just fine as" "long as they are indented" "deeper than the first line" ...
#> $ R specific pieces :List of 4
#> ..$ trials : int 5
#> ..$ pi : num 3.14
#> ..$ dataset: chr "demo-data.csv"
#> ..$ cores : int 1
# reset options
options(op)