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Add scryer_path/1 manifest term #60

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Add scryer_path/1 manifest term #60

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7b170c0
Add scryer_path/1 manifest term for custom package search paths
jjtolton Oct 25, 2025
58efa2e
Refactor failure-driven loop to explicit iteration with findall
jjtolton Oct 25, 2025
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8 changes: 8 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,14 @@ dependencies([
% A path to a local package
dependency("test_local", path("./local_package"))
]).
% Optional. Custom search paths for packages.
% Specify paths to other scryer-manifest.pl files whose package directories
% should be searched. Bakage will automatically determine where each manifest's
% packages are located.
scryer_path([
"vendor/scryer-manifest.pl",
"libs/other-project/scryer-manifest.pl"
]).

```

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39 changes: 38 additions & 1 deletion src/bakage.pl
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Expand Up @@ -126,6 +126,41 @@
append([RootChars, "/scryer_libs"], ScryerPath)
).

% Get the current project's manifest (if it exists)
current_project_manifest(Manifest) :-
find_project_root(Root),
append([Root, "/scryer-manifest.pl"], ManifestPath),
file_exists(ManifestPath),
parse_manifest(ManifestPath, Manifest).

% Extract scryer_path/1 terms from manifest (list of manifest file paths)
manifest_scryer_paths(Manifest, ManifestPaths) :-
member(scryer_path(ManifestPaths), Manifest),
ManifestPaths = [_|_].

% Given a manifest file path, derive where its packages are located
manifest_path_to_scryer_libs(ManifestPathChars, ScryerLibsPath) :-
join_sep_split(ManifestPathChars, "/", Segments),
append(DirSegments, [_ManifestFile], Segments),
join_sep_split(DirChars, "/", DirSegments),
append([DirChars, "/scryer_libs"], ScryerLibsPath).

% Generate scryer path candidates via backtracking
scryer_path_candidate(Path) :-
getenv("SCRYER_PATH", Path).
scryer_path_candidate(ScryerLibsPath) :-
current_project_manifest(Manifest),
manifest_scryer_paths(Manifest, ManifestPaths),
member(ManifestPath, ManifestPaths),
manifest_path_to_scryer_libs(ManifestPath, ScryerLibsPath).
scryer_path_candidate(Path) :-
find_project_root(RootChars),
append([RootChars, "/scryer_libs"], Path).

% Collect all scryer path candidates into a list
all_scryer_path_candidates(Paths) :-
findall(Path, scryer_path_candidate(Path), Paths).

% the message sent to the user when a dependency is malformed
user_message_malformed_dependency(D, Error):-
current_output(Out),
Expand All @@ -144,9 +179,11 @@

package_main_file(Package, PackageMainFile) :-
atom_chars(Package, PackageChars),
scryer_path(ScryerPath),
all_scryer_path_candidates(CandidatePaths),
member(ScryerPath, CandidatePaths),
append([ScryerPath, "/packages/", PackageChars], PackagePath),
append([PackagePath, "/", "scryer-manifest.pl"], ManifestPath),
file_exists(ManifestPath),
parse_manifest(ManifestPath, Manifest),
member(main_file(MainFile), Manifest),
append([PackagePath, "/", MainFile], PackageMainFileChars),
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