64 lines
1.7 KiB
Nix
64 lines
1.7 KiB
Nix
{ lib }:
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let
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echo_colored_body = start_escape:
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# Body of a function that behaves like "echo" but
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# has the output colored by the given start_escape
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# sequence. E.g.
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#
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# * echo_x "Building ..."
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# * echo_x -n "Running "
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#
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# This is more complicated than apparent at first sight
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# because:
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# * The color markers and the text must be print
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# in the same echo statement. Otherise, other
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# intermingled text from concurrent builds will
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# be colored as well.
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# * We need to preserve the trailing newline of the
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# echo if and only if it is present. Bash likes
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# to strip those if we capture the output of echo
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# in a variable.
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# * Leading "-" will be interpreted by test as an
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# option for itself. Therefore, we prefix it with
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# an x in `[[ "x$1" =~ ^x- ]]`.
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''
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local echo_args="";
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while [[ "x$1" =~ ^x- ]]; do
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echo_args+=" $1"
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shift
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done
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local start_escape="$(printf '${start_escape}')"
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local reset="$(printf '\033[0m')"
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echo $echo_args $start_escape"$@"$reset
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'';
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echo_conditional_colored_body = colors: start_escape:
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if colors == "always" then
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(echo_colored_body start_escape)
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else
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''echo "$@"'';
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in {
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echo_colored = colors: ''
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echo_colored() {
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${echo_conditional_colored_body colors "\\033[0;1;32m"}
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}
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echo_error() {
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${echo_conditional_colored_body colors "\\033[0;1;31m"}
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}
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'';
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noisily = colors: verbose: ''
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noisily() {
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${
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lib.optionalString verbose ''
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echo_colored -n "Running "
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echo $@
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''
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}
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$@
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}
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'';
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}
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