Make the WWS.inherits consistent with variants inheritance configuration

doc/custom-build.md

@@ -100,22 +100,6 @@ Subsection `ligations` is used to customize the ligation set assigned to `calt`
 
 * `inherits`: Optional, String, defines the inherited ligation set. When absent, the ligation set will not inherit any other sets. Valid values are:
 
-  - `--default-center-ops--`: Default ligation set would be assigned to undefined.
-  - `--c-center-ops--`: Default ligation set would be assigned to undefined.
-  - `--default-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--c-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--raku-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--ml-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--fstar-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--haskell-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--matlab-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--verilog-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--wolfram-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--erlang-equality-inequality--`: Default ligation set would be assigned to undefined.
-  - `--default-kern--`: Default ligation set would be assigned to undefined.
-  - `--default-chaining--`: Default ligation set would be assigned to undefined.
-  - `--fast-chaining--`: Default ligation set would be assigned to undefined.
-  - `--c-like-chaining--`: Default ligation set would be assigned to undefined.
   - `default-calt`: Inherit default ligation set.
   - `dlig`: Default ligation set would be assigned to Discretionary ligatures.
   - `clike`: Default ligation set would be assigned to C-Like.
@@ -3213,6 +3197,17 @@ Subsection `slopes` is used to change the slope angles and grades that the custo
    * `menu`: String from `upright`, `italic` or `oblique`. Configures the slope grade used when naming fonts.
    * `css`: String from `normal`, `italic` or `oblique`. Configures the [CSS font-style](https://developer.mozilla.org/zh-CN/docs/Web/CSS/font-style) value.
 
+In addition to list all the weights/widths/slopes directly, the user could also configure the weights/widths/slopes list using “inherits” to inherit the list from another build plan:
+
+```toml
+[buildPlans.IosevkaCustom2]
+family = "Iosevka Custom 2"
+
+weights.inherits = "buildPlans.IosevkaCustom1" # Inherit weights list from "IosevkaCustom1"
+widths.inherits = "buildPlans.IosevkaCustom1"  # Inherit widths list from "IosevkaCustom1"
+slopes.inherits = "default"  # Inherit slopes list from default
+```
+
 #### Compatibility Ligatures
 
 Certain software, notably Emacs, relies on pre-encoded ligatures instead of OpenType to provide ligations. Iosevka could be configured with additional subsection `compatibilityLigatures`, being an array of records with following fields:

tools/amend-readme/src/sections/lig-set-pre-def.mjs

@@ -11,6 +11,7 @@ export default async function processLigSetPreDef(argv, dirs) {
 	const headerPath = path.resolve(dirs.fragments, "description-predefined-ligation-sets.md");
 	md.log(await fs.promises.readFile(headerPath, "utf-8"));
 	for (const gr in ligData.rawSets) {
+		if (!ligData.rawSets[gr].desc) continue;
 		const readmeDesc =
 			ligData.rawSets[gr].readmeDesc ||
 			`Default ligation set would be assigned to ${ligData.rawSets[gr].desc}`;

verdafile.mjs

@@ -1272,22 +1272,48 @@ function resolveWws(bpName, buildPlans, defaultConfig) {
 function resolveWwsAspect(aspectName, bpName, buildPlans, defaultConfig, deps) {
 	const bp = buildPlans[bpName];
 	if (!bp) fail(`Build plan ${bpName} not found.`);
+	if (deps.includes(bp)) {
+		fail(`Circular dependency detected when resolving ${aspectName} of ${bp.family}.`);
+	}
+	const updatedDeps = [...deps, bpName];
 
 	if (bp[aspectName]) {
-		return shimBpAspect(aspectName, bp[aspectName], defaultConfig[aspectName]);
+		const aspect = bp[aspectName];
+		if (typeof aspect.inherits == "string") {
+			if (aspect.inherits === "default") {
+				return defaultConfig[aspectName];
+			} else {
+				// Make sure it start with `buildPlans.`
+				if (!aspect.inherits.startsWith("buildPlans.")) {
+					fail(
+						`Invalid \`inherits\`2 value for ${aspectName} in ${bpName}. ` +
+							`It must be \`default\` or start with \`buildPlans.\`.`,
+					);
+				}
+				const inheritedPlanName = aspect.inherits.slice("buildPlans.".length);
+				return resolveWwsAspect(
+					aspectName,
+					inheritedPlanName,
+					buildPlans,
+					defaultConfig,
+					updatedDeps,
+				);
+			}
+		} else {
+			return shimBpAspect(aspectName, bp[aspectName], defaultConfig[aspectName]);
+		}
 	} else if (bp[`${aspectName}-inherits`]) {
+		echo.warn(
+			`The ${aspectName}-inherits syntax is deprecated. ` +
+				`Use the new syntax \`${aspectName}.inherits = "buildPlans.<plan name>\` instead.`,
+		);
 		const inheritedPlanName = bp[`${aspectName}-inherits`];
-		const inheritedPlan = buildPlans[inheritedPlanName];
-		if (deps.includes(inheritedPlan))
-			fail(`Circular dependency detected when resolving ${aspectName} of ${bp.family}.`);
-
-		const updatedDes = [...deps, bpName];
 		return resolveWwsAspect(
 			aspectName,
 			inheritedPlanName,
 			buildPlans,
 			defaultConfig,
-			updatedDes,
+			updatedDeps,
 		);
 	} else {
 		return defaultConfig[aspectName];
@@ -1304,11 +1330,18 @@ function shimBpAspect(aspectName, aspect, defaultAspect) {
 }
 function shimBpAspectKey(aspectName, sink, k, v, defaultAspect) {
 	if (typeof v === "string") {
-		if (!/^default\./.test(v))
-			throw new Error(`Invalid configuration '${v}' for ${aspectName}.${k}'`);
+		if (!v.startsWith("default."))
+			throw new Error(
+				`Invalid configuration '${v}' for ${aspectName}.${k}'. ` +
+					`It must start with 'default.'`,
+			);
 		const remappingKey = v.slice("default.".length);
 		if (!defaultAspect[remappingKey])
-			throw new Error(`Invalid configuration '${v}' for ${aspectName}.${k}'`);
+			throw new Error(
+				`Invalid configuration '${v}' for ${aspectName}.${k}'. ` +
+					`The default aspect doesn't have a key '${remappingKey}'.`,
+			);
+
 		sink[k] = defaultAspect[remappingKey];
 	} else {
 		sink[k] = v;