docs: add package documentation and runnable examples

sonar/doc.go

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+// Package sonar is a Go client for the SonarQube web API.
+//
+// The root type is Client. Create one with NewClient and reach each API area
+// through a typed service field, for example client.Projects, client.Issues or
+// client.Qualitygates. V2 API services are grouped under client.V2.
+//
+// # Authentication
+//
+// SonarQube supports token authentication (recommended) and basic auth. Both
+// can be supplied at construction via ClientCreateOptions or with the WithToken
+// and WithBasicAuth options:
+//
+//	client, err := sonar.NewClient(nil,
+//		sonar.WithBaseURL("https://sonarqube.example.com/api/"),
+//		sonar.WithToken("my-token"),
+//	)
+//
+// In CI/CD environments the SONAR_URL, SONAR_TOKEN, SONAR_USERNAME, and
+// SONAR_PASSWORD environment variables can be used instead:
+//
+//	client, err := sonar.NewClientFromEnv()
+//
+// # Requests and responses
+//
+// Every service method takes a context.Context and, where applicable, a typed
+// *<Service><Method>Options struct whose fields are validated before the request
+// is sent. Methods return the decoded response, the raw *http.Response, and an
+// error.
+//
+// # V1 vs V2
+//
+// V1 endpoints encode parameters as URL query values (url:"" struct tags). V2
+// endpoints use JSON tags, support a request body, and live under the V2 field;
+// the "v2/" path prefix is added automatically.
+//
+// # Errors
+//
+// API errors are returned as *ResponseError. Use the sentinel helpers
+// (IsNotFound, IsUnauthorized, IsForbidden, IsConflict, IsRateLimited,
+// IsServerError) to branch on the HTTP status without unwrapping by hand.
+//
+// # Pagination
+//
+// Paginated V1 endpoints expose both a single-page method (Search) and a
+// convenience method that fetches every page (SearchAll / ListAll).
+//
+// # Resilience
+//
+// Retries with exponential backoff and jitter are opt-in via WithRetry. The
+// transport can be customized with WithTransportConfig, and arbitrary
+// http.RoundTripper middleware (logging, tracing, metrics) can be attached with
+// WithMiddleware.
+package sonar

sonar/example_test.go

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+package sonar_test
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/boxboxjason/sonarqube-client-go/sonar"
+)
+
+// Create a client with token authentication and search for projects.
+func Example() {
+	client, err := sonar.NewClient(nil,
+		sonar.WithBaseURL("https://sonarqube.example.com/api/"),
+		sonar.WithToken("my-token"),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	result, _, err := client.Projects.Search(context.Background(), &sonar.ProjectsSearchOptions{
+		Query: "my-service",
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	for _, project := range result.Components {
+		fmt.Println(project.Key)
+	}
+}
+
+// Fetch every page of a paginated endpoint with the SearchAll helper.
+func ExampleProjectsService_SearchAll() {
+	client, err := sonar.NewClient(nil,
+		sonar.WithBaseURL("https://sonarqube.example.com/api/"),
+		sonar.WithToken("my-token"),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	//nolint:exhaustruct // only the filter we care about is set
+	projects, _, err := client.Projects.SearchAll(context.Background(), &sonar.ProjectsSearchOptions{})
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("found %d projects\n", len(projects))
+}
+
+// Enable retries with exponential backoff for transient server errors.
+func ExampleWithRetry() {
+	client, err := sonar.NewClient(nil,
+		sonar.WithBaseURL("https://sonarqube.example.com/api/"),
+		sonar.WithToken("my-token"),
+		sonar.WithRetry(sonar.RetryOptions{
+			MaxAttempts:          3,
+			InitialDelay:         100 * time.Millisecond,
+			MaxDelay:             2 * time.Second,
+			RetryableStatusCodes: []int{502, 503, 504},
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	_ = client
+	// Output:
+}
+
+// Branch on the HTTP status of an API error using the sentinel helpers.
+func ExampleIsNotFound() {
+	client, err := sonar.NewClient(nil,
+		sonar.WithBaseURL("https://sonarqube.example.com/api/"),
+		sonar.WithToken("my-token"),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	_, err = client.Projects.Delete(context.Background(), &sonar.ProjectsDeleteOptions{Project: "missing-project"})
+	if sonar.IsNotFound(err) {
+		fmt.Println("project not found")
+	}
+}
+
+// Configure a client from SONAR_URL and SONAR_TOKEN environment variables.
+func ExampleNewClientFromEnv() {
+	client, err := sonar.NewClientFromEnv()
+	if err != nil {
+		panic(err)
+	}
+
+	_ = client
+	// Output:
+}