[Libguestfs] [PATCH v3 1/2] daemon: add split_key_value_strings helper

Add a simple helper to turn a list of strings into key/value pairs, splitting by '=', with the possibility to apply a function to unquote values. Add also a simple unquote function. --- daemon/utils.ml | 16 ++++++++++++++++ daemon/utils.mli | 11 +++++++++++ 2 files changed, 27 insertions(+) diff --git a/daemon/utils.ml b/daemon/utils.ml index d87ad75db..9a2aab3f5 100644 --- a/daemon/utils.ml +++ b/daemon/utils.ml @@ -229,3 +229,19 @@ let unix_canonical_path path = let path = String.nsplit "/" path in let path = List.filter ((<>) "") path in (if is_absolute then "/" else "") ^ String.concat "/" path + +let simple_unquote s = + let n = String.length s in + if n >= 2 && + ((s.[0] = '"' && s.[n-1] = '"') || (s.[0] = '\'' && s.[n-1] = '\'')) then + String.sub s 1 (n-2) + else + s + +let parse_key_value_strings ?unquote lines = + let lines = List.filter ((<>) "") lines in + let lines = List.filter (fun s -> s.[0] <> '#') lines in + let lines = List.map (String.split "=") lines in + match unquote with + | None -> lines + | Some f -> List.map (fun (k, v) -> (k, f v)) lines diff --git a/daemon/utils.mli b/daemon/utils.mli index f312bde41..61c1caf24 100644 --- a/daemon/utils.mli +++ b/daemon/utils.mli @@ -97,5 +97,16 @@ val unix_canonical_path : string -> string The path is modified in place because the result is always the same length or shorter than the argument passed. *) +val simple_unquote : string -> string +(** Unquote the string, by removing a pair of single- or double-quotes + at the beginning and the end of the string. + + No other handling is done, unlike what {!shell_unquote} does. *) + +val parse_key_value_strings : ?unquote:(string -> string) -> string list -> (string * string) list +(** Split the lines by the [=] separator; if [unquote] is specified, + it is applied on the values as unquote function. Empty lines, + or that start with a comment character [#], are ignored. *) + (**/**) val get_verbose_flag : unit -> bool -- 2.13.6