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