319 lines
6.9 KiB
Bash
319 lines
6.9 KiB
Bash
#! @shell@ -e
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# FIXME: rewrite this in a more suitable language.
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usage () {
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exec man nixos-option
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exit 1
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}
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#####################
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# Process Arguments #
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#####################
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xml=false
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verbose=false
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nixPath=""
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option=""
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argfun=""
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for arg; do
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if test -z "$argfun"; then
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case $arg in
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-*)
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sarg="$arg"
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longarg=""
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while test "$sarg" != "-"; do
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case $sarg in
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--*) longarg=$arg; sarg="--";;
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-I) argfun="include_nixpath";;
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-*) usage;;
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esac
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# remove the first letter option
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sarg="-${sarg#??}"
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done
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;;
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*) longarg=$arg;;
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esac
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for larg in $longarg; do
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case $larg in
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--xml) xml=true;;
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--verbose) verbose=true;;
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--help) usage;;
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-*) usage;;
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*) if test -z "$option"; then
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option="$larg"
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else
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usage
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fi;;
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esac
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done
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else
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case $argfun in
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set_*)
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var=$(echo $argfun | sed 's,^set_,,')
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eval $var=$arg
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;;
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include_nixpath)
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nixPath="-I $arg $nixPath"
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;;
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esac
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argfun=""
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fi
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done
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if $verbose; then
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set -x
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else
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set +x
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fi
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#############################
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# Process the configuration #
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#############################
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evalNix(){
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result=$(nix-instantiate ${nixPath:+$nixPath} - --eval-only "$@" 2>&1)
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if test $? -eq 0; then
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cat <<EOF
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$result
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EOF
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return 0;
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else
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sed -n '
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/^error/ { s/, at (string):[0-9]*:[0-9]*//; p; };
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/^warning: Nix search path/ { p; };
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' <<EOF
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$result
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EOF
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return 1;
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fi
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}
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header="let
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nixos = import <nixpkgs/nixos> {};
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nixpkgs = import <nixpkgs> {};
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in with nixpkgs.lib;
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"
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# This function is used for converting the option definition path given by
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# the user into accessors for reaching the definition and the declaration
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# corresponding to this option.
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generateAccessors(){
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if result=$(evalNix --strict --show-trace <<EOF
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$header
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let
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path = "${option:+$option}";
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pathList = splitString "." path;
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walkOptions = attrsNames: result:
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if attrsNames == [] then
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result
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else
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let name = head attrsNames; rest = tail attrsNames; in
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if isOption result.options then
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walkOptions rest {
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options = result.options.type.getSubOptions "";
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opt = ''(\${result.opt}.type.getSubOptions "")'';
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cfg = ''\${result.cfg}."\${name}"'';
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}
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else
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walkOptions rest {
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options = result.options.\${name};
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opt = ''\${result.opt}."\${name}"'';
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cfg = ''\${result.cfg}."\${name}"'';
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}
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;
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walkResult = (if path == "" then x: x else walkOptions pathList) {
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options = nixos.options;
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opt = ''nixos.options'';
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cfg = ''nixos.config'';
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};
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in
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''let option = \${walkResult.opt}; config = \${walkResult.cfg}; in''
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EOF
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)
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then
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echo $result
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else
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# In case of error we want to ignore the error message roduced by the
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# script above, as it is iterating over each attribute, which does not
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# produce a nice error message. The following code is a fallback
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# solution which is cause a nicer error message in the next
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# evaluation.
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echo "\"let option = nixos.options${option:+.$option}; config = nixos.config${option:+.$option}; in\""
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fi
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}
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header="$header
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$(eval echo $(generateAccessors))
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"
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evalAttr(){
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local prefix="$1"
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local strict="$2"
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local suffix="$3"
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# If strict is set, then set it to "true".
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test -n "$strict" && strict=true
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evalNix ${strict:+--strict} <<EOF
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$header
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let
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value = $prefix${suffix:+.$suffix};
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strict = ${strict:-false};
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cleanOutput = x: with nixpkgs.lib;
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if isDerivation x then x.outPath
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else if isFunction x then "<CODE>"
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else if strict then
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if isAttrs x then mapAttrs (n: cleanOutput) x
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else if isList x then map cleanOutput x
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else x
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else x;
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in
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cleanOutput value
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EOF
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}
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evalOpt(){
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evalAttr "option" "" "$@"
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}
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evalCfg(){
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local strict="$1"
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evalAttr "config" "$strict"
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}
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findSources(){
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local suffix=$1
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evalNix --strict <<EOF
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$header
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option.$suffix
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EOF
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}
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# Given a result from nix-instantiate, recover the list of attributes it
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# contains.
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attrNames() {
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local attributeset=$1
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# sed is used to replace un-printable subset by 0s, and to remove most of
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# the inner-attribute set, which reduce the likelyhood to encounter badly
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# pre-processed input.
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echo "builtins.attrNames $attributeset" | \
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sed 's,<[A-Z]*>,0,g; :inner; s/{[^\{\}]*};/0;/g; t inner;' | \
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evalNix --strict
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}
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# map a simple list which contains strings or paths.
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nixMap() {
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local fun="$1"
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local list="$2"
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local elem
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for elem in $list; do
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test $elem = '[' -o $elem = ']' && continue;
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$fun $elem
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done
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}
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# This duplicates the work made below, but it is useful for processing
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# the output of nixos-option with other tools such as nixos-gui.
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if $xml; then
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evalNix --xml --no-location <<EOF
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$header
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let
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sources = builtins.map (f: f.source);
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opt = option;
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cfg = config;
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in
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with nixpkgs.lib;
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let
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optStrict = v:
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let
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traverse = x :
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if isAttrs x then
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if x ? outPath then true
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else all id (mapAttrsFlatten (n: traverseNoAttrs) x)
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else traverseNoAttrs x;
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traverseNoAttrs = x:
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# do not continue in attribute sets
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if isAttrs x then true
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else if isList x then all id (map traverse x)
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else true;
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in assert traverse v; v;
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in
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if isOption opt then
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optStrict ({}
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// optionalAttrs (opt ? default) { inherit (opt) default; }
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// optionalAttrs (opt ? example) { inherit (opt) example; }
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// optionalAttrs (opt ? description) { inherit (opt) description; }
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// optionalAttrs (opt ? type) { typename = opt.type.description; }
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// optionalAttrs (opt ? options) { inherit (opt) options; }
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// {
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# to disambiguate the xml output.
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_isOption = true;
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declarations = sources opt.declarations;
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definitions = sources opt.definitions;
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value = cfg;
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})
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else
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opt
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EOF
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exit $?
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fi
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if test "$(evalOpt "_type" 2> /dev/null)" = '"option"'; then
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echo "Value:"
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evalCfg 1
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echo
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echo "Default:"
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if default=$(evalOpt "default" - 2> /dev/null); then
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echo "$default"
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else
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echo "<None>"
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fi
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echo
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if example=$(evalOpt "example" - 2> /dev/null); then
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echo "Example:"
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echo "$example"
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echo
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fi
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echo "Description:"
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echo
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eval printf $(evalOpt "description")
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echo $desc;
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printPath () { echo " $1"; }
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echo "Declared by:"
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nixMap printPath "$(findSources "declarations")"
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echo
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echo "Defined by:"
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nixMap printPath "$(findSources "files")"
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echo
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else
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# echo 1>&2 "Warning: This value is not an option."
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result=$(evalCfg "")
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if names=$(attrNames "$result" 2> /dev/null); then
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echo 1>&2 "This attribute set contains:"
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escapeQuotes () { eval echo "$1"; }
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nixMap escapeQuotes "$names"
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else
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echo 1>&2 "An error occurred while looking for attribute names."
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echo $result
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fi
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fi
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