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{ lib, ... }:
# takes a few args and creats a valid xml tag pair out of it
#
# testTag = mkTag {
# name = "name";
# args = [
# {
# key = "arg1";
# val = "arg1val";
# }
# {
# key = "arg2";
# val = "arg2val";
# }
# ];
# value = "qwe";
# children = [
# (mkTag { name = "nested"; args = []; value = "qwe"; children = [];})
# ];
# };
#
# <name arg1=arg1val arg2=arg2val>
# value
# {children}
# </name>
{
name, # name of the tag to be used, such as `secret`, `description`, ...
args ? [ ], # args, [ { key="a"; val="b"; } { key="c"; val="d"; } ]
value ? "", # the value to place in the middle
children ? [ ], # the child elements
closing ? true, # add a closing tag
}:
let
# filter out all values missing a key
# this allows passing empty args such as `{}` which then get discarded
filteredArgs = (builtins.filter (x: x ? key) args);
# convert the list of attr sets into a list of strings
mappedArgs = (map (x: "${x.key}='${x.val}'") filteredArgs);
# [ "A" "B" "C" ] => [ "A" " " "B" " " "C" ]
spacedArgs = lib.strings.intersperse "" mappedArgs;
# [ "A" " " "B" " " "C" ] => "A B C"
joinedArgs = lib.strings.concatStrings spacedArgs;
# prefix the args with a space when inserting
args_str = lib.optionalString (filteredArgs != [ ]) (" " + joinedArgs);
child_evaled = lib.strings.concatStrings children;
cond = condition: value: if condition then value else "";
closingTag = if closing == true then "</${name}>" else "";
in
"<${name}${args_str}${cond (closing == false) "/"}>${value}${child_evaled}${lib.optionalString (closing) closingTag}"
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