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lib: add functions to create DAGs from lists

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rycee 2024-04-18 21:30:40 +03:00 committed by NotAShelf
parent 2d08f3ad39
commit f8d564c595
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1 changed files with 37 additions and 2 deletions
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39
lib/dag.nix
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@ -8,10 +8,10 @@
# - the addition of the function `entryBefore` indicating a "wanted
# by" relationship.
{lib}: let
inherit (builtins) isAttrs attrValues attrNames elem all;
inherit (builtins) isAttrs attrValues attrNames elem all head tail length;
inherit (lib.attrsets) filterAttrs mapAttrs;
inherit (lib.lists) toposort;
inherit (lib.nvim.dag) isEntry entryBetween;
inherit (lib.nvim.dag) empty isEntry entryBetween entryAfter entriesBetween;
in {
empty = {};
@ -108,6 +108,41 @@ in {
entryAfter = entryBetween [];
entryBefore = before: entryBetween before [];
# Given a list of entries, this function places them in order within the DAG.
# Each entry is labeled "${tag}-${entry index}" and other DAG entries can be
# added with 'before' or 'after' referring these indexed entries.
#
# The entries as a whole can be given a relation to other DAG nodes. All
# generated nodes are then placed before or after those dependencies.
entriesBetween = tag: let
go = i: before: after: entries: let
name = "${tag}-${toString i}";
i' = i + 1;
in
if entries == []
then empty
else if length entries == 1
then {
"${name}" = entryBetween before after (head entries);
}
else
{
"${name}" = entryAfter after (head entries);
}
// go (i + 1) before [name] (tail entries);
in
go 0;
entriesAnywhere = tag: entriesBetween tag [] [];
entriesAfter = tag: entriesBetween tag [];
entriesBefore = tag: before: entriesBetween tag before [];
# mkLuarcSection and mkVimrcSection take a section DAG
# and return a string containing a comment to identify
# the section, and the data contained within the section
#
# all operations are done without any modifications
# to the inputted section data
mkLuarcSection = section: ''
-- SECTION: ${section.name}
${section.data}