Prepare release 0.23.0

Author: dominikbraun

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),  and this project
 adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.23.0] - 2023-07-05
+
+**Are you using graph? [Check out the graph user survey](https://forms.gle/MLKUZKMeCRxTfj4v9)**
+
+### Added
+* Added the `AllPathsBetween` function for computing all paths between two vertices.
+
 ## [0.22.3] - 2023-06-14
 
 ### Changed

README.md

@@ -5,6 +5,8 @@
 A library for creating generic graph data structures and modifying, analyzing,
 and visualizing them.
 
+**Are you using graph? [Check out the graph user survey.](https://forms.gle/MLKUZKMeCRxTfj4v9)**
+
 # Features
 
 * Generic vertices of any type, such as `int` or `City`.
@@ -398,3 +400,5 @@ To implement the `Store` interface appropriately, take a look at the [documentat
 # Documentation
 
 The full documentation is available at [pkg.go.dev](https://pkg.go.dev/github.com/dominikbraun/graph).
+
+**Are you using graph? [Check out the graph user survey.](https://forms.gle/MLKUZKMeCRxTfj4v9)**

paths.go

@@ -233,14 +233,22 @@ func findSCC[K comparable](vertexHash K, state *sccState[K]) {
 	}
 }
 
-// AllPathsBetween list all paths from start to end.
+// AllPathsBetween computes and returns all paths between two given vertices. A
+// path is represented as a slice of vertex hashes. The returned slice contains
+// these paths.
+//
+// AllPathsBetween utilizes a non-recursive, stack-based implementation. It has
+// an estimated runtime complexity of O(n^2) where n is the number of vertices.
 func AllPathsBetween[K comparable, T any](g Graph[K, T], start, end K) ([][]K, error) {
 	adjacencyMap, err := g.AdjacencyMap()
 	if err != nil {
 		return nil, err
 	}
 
-	mainStack, viceStack := newStack[K](), newStack[stack[K]]()
+	// The algorithm used relies on stacks instead of recursion. It is described
+	// here: https://boycgit.github.io/all-paths-between-two-vertex/
+	mainStack := newStack[K]()
+	viceStack := newStack[stack[K]]()
 
 	checkEmpty := func() error {
 		if mainStack.isEmpty() || viceStack.isEmpty() {
@@ -270,10 +278,11 @@ func AllPathsBetween[K comparable, T any](g Graph[K, T], start, end K) ([][]K, e
 
 	buildStack := func() error {
 		if err = checkEmpty(); err != nil {
-			return errors.New("empty stack")
+			return fmt.Errorf("unable to build stack: %w", err)
 		}
 
 		elements, _ := viceStack.top()
+
 		for !elements.isEmpty() {
 			element, _ := elements.pop()
 			buildLayer(element)
@@ -285,11 +294,10 @@ func AllPathsBetween[K comparable, T any](g Graph[K, T], start, end K) ([][]K, e
 
 	removeLayer := func() error {
 		if err = checkEmpty(); err != nil {
-			return errors.New("empty stack")
+			return fmt.Errorf("unable to remove layer: %w", err)
 		}
 
-		e, _ := viceStack.top()
-		if !e.isEmpty() {
+		if e, _ := viceStack.top(); !e.isEmpty() {
 			return errors.New("the top element of vice-stack is not empty")
 		}
 
@@ -299,12 +307,8 @@ func AllPathsBetween[K comparable, T any](g Graph[K, T], start, end K) ([][]K, e
 		return nil
 	}
 
-	// init the first layer
-
 	buildLayer(start)
 
-	// loop
-
 	allPaths := make([][]K, 0)
 
 	for !mainStack.isEmpty() {