improve godoc; replace Loggers with embeded fields; refactor Ctx api

cmd/dep/ensure.go

@@ -104,7 +104,7 @@ type ensureCommand struct {
 
 func (cmd *ensureCommand) Run(ctx *dep.Ctx, args []string) error {
 	if cmd.examples {
-		ctx.Loggers.Err.Println(strings.TrimSpace(ensureExamples))
+		ctx.Err.Println(strings.TrimSpace(ensureExamples))
 		return nil
 	}
 
@@ -121,8 +121,8 @@ func (cmd *ensureCommand) Run(ctx *dep.Ctx, args []string) error {
 	defer sm.Release()
 
 	params := p.MakeParams()
-	if ctx.Loggers.Verbose {
-		params.TraceLogger = ctx.Loggers.Err
+	if ctx.Verbose {
+		params.TraceLogger = ctx.Err
 	}
 	params.RootPackageTree, err = pkgtree.ListPackages(p.AbsRoot, string(p.ImportRoot))
 	if err != nil {
@@ -136,7 +136,7 @@ func (cmd *ensureCommand) Run(ctx *dep.Ctx, args []string) error {
 	if cmd.update {
 		applyUpdateArgs(args, &params)
 	} else {
-		err := applyEnsureArgs(ctx.Loggers.Err, args, cmd.overrides, p, sm, &params)
+		err := applyEnsureArgs(ctx.Err, args, cmd.overrides, p, sm, &params)
 		if err != nil {
 			return err
 		}
@@ -169,7 +169,7 @@ func (cmd *ensureCommand) Run(ctx *dep.Ctx, args []string) error {
 		return err
 	}
 	if cmd.dryRun {
-		return sw.PrintPreparedActions(ctx.Loggers.Out)
+		return sw.PrintPreparedActions(ctx.Out)
 	}
 
 	return errors.Wrap(sw.Write(p.AbsRoot, sm, false), "grouped write of manifest, lock and vendor")

cmd/dep/glide_importer_test.go

@@ -21,16 +21,16 @@ import (
 const testGlideProjectRoot = "github.com/golang/notexist"
 
 var (
-	discardLogger  = log.New(ioutil.Discard, "", 0)
-	discardLoggers = &dep.Loggers{Out: discardLogger, Err: discardLogger}
+	discardLogger = log.New(ioutil.Discard, "", 0)
 )
 
 func newTestContext(h *test.Helper) *dep.Ctx {
 	h.TempDir("src")
 	pwd := h.Path(".")
 	return &dep.Ctx{
-		GOPATH:  pwd,
-		Loggers: discardLoggers,
+		GOPATH: pwd,
+		Out:    discardLogger,
+		Err:    discardLogger,
 	}
 }
 

cmd/dep/gopath_scanner.go

@@ -46,7 +46,7 @@ func newGopathScanner(ctx *dep.Ctx, directDeps map[string]bool, sm gps.SourceMan
 func (g *gopathScanner) InitializeRootManifestAndLock(rootM *dep.Manifest, rootL *dep.Lock) error {
 	var err error
 
-	g.ctx.Loggers.Err.Println("Searching GOPATH for projects...")
+	g.ctx.Err.Println("Searching GOPATH for projects...")
 	g.pd, err = g.scanGopathForDependencies()
 	if err != nil {
 		return err
@@ -123,7 +123,7 @@ func (g *gopathScanner) overlay(rootM *dep.Manifest, rootL *dep.Lock) {
 		unlockedProjects = append(unlockedProjects, string(pr))
 	}
 	if len(unlockedProjects) > 0 {
-		g.ctx.Loggers.Err.Printf("Following dependencies were not found in GOPATH. "+
+		g.ctx.Err.Printf("Following dependencies were not found in GOPATH. "+
 			"Dep will use the most recent versions of these projects.\n  %s",
 			strings.Join(unlockedProjects, "\n  "))
 	}
@@ -211,7 +211,7 @@ func (g *gopathScanner) scanGopathForDependencies() (projectData, error) {
 	var syncDepGroup sync.WaitGroup
 	syncDep := func(pr gps.ProjectRoot, sm gps.SourceManager) {
 		if err := sm.SyncSourceFor(gps.ProjectIdentifier{ProjectRoot: pr}); err != nil {
-			g.ctx.Loggers.Err.Printf("%+v", errors.Wrapf(err, "Unable to cache %s", pr))
+			g.ctx.Err.Printf("%+v", errors.Wrapf(err, "Unable to cache %s", pr))
 		}
 		syncDepGroup.Done()
 	}

cmd/dep/hash_in.go

@@ -51,6 +51,6 @@ func (hashinCommand) Run(ctx *dep.Ctx, args []string) error {
 	if err != nil {
 		return errors.Wrap(err, "prepare solver")
 	}
-	ctx.Loggers.Out.Println(gps.HashingInputsAsString(s))
+	ctx.Out.Println(gps.HashingInputsAsString(s))
 	return nil
 }

cmd/dep/init.go

@@ -135,8 +135,8 @@ func (cmd *initCommand) Run(ctx *dep.Ctx, args []string) error {
 		ProjectAnalyzer: rootAnalyzer,
 	}
 
-	if ctx.Loggers.Verbose {
-		params.TraceLogger = ctx.Loggers.Err
+	if ctx.Verbose {
+		params.TraceLogger = ctx.Err
 	}
 
 	s, err := gps.Prepare(params, sm)
@@ -169,7 +169,7 @@ func (cmd *initCommand) Run(ctx *dep.Ctx, args []string) error {
 		return err
 	}
 	if vendorbak != "" {
-		ctx.Loggers.Err.Printf("Old vendor backed up to %v", vendorbak)
+		ctx.Err.Printf("Old vendor backed up to %v", vendorbak)
 	}
 
 	sw, err := dep.NewSafeWriter(m, nil, l, dep.VendorAlways)

cmd/dep/main.go

@@ -12,6 +12,7 @@ import (
 	"io"
 	"log"
 	"os"
+	"path/filepath"
 	"strings"
 	"text/tabwriter"
 
@@ -46,11 +47,10 @@ func main() {
 
 // A Config specifies a full configuration for a dep execution.
 type Config struct {
-	// Args hold the command-line arguments, starting with the program name.
-	Args           []string
-	Stdout, Stderr io.Writer
-	WorkingDir     string
-	Env            []string
+	WorkingDir     string    // Where to execute
+	Args           []string  // Command-line arguments, starting with the program name.
+	Env            []string  // Environment variables
+	Stdout, Stderr io.Writer // Log output
 }
 
 // Run executes a configuration and returns an exit code.
@@ -135,23 +135,23 @@ func (c *Config) Run() (exitCode int) {
 			}
 
 			// Parse the flags the user gave us.
-			// flag package automaticly prints usage and error message in err != nil
+			// flag package automatically prints usage and error message in err != nil
 			// or if '-h' flag provided
 			if err := fs.Parse(c.Args[2:]); err != nil {
 				exitCode = 1
 				return
 			}
 
-			loggers := &dep.Loggers{
+			// Set up the dep context.
+			ctx := &dep.Ctx{
 				Out:     log.New(c.Stdout, "", 0),
 				Err:     errLogger,
 				Verbose: *verbose,
 			}
-
-			// Set up the dep context.
-			ctx, err := dep.NewContext(c.WorkingDir, c.Env, loggers)
+			gopaths := filepath.SplitList(getEnv(c.Env, "GOPATH"))
+			err := ctx.SetPaths(c.WorkingDir, gopaths...)
 			if err != nil {
-				loggers.Err.Println(err)
+				errLogger.Printf("%q not in any GOPATH: %s\n", c.WorkingDir, err)
 				exitCode = 1
 				return
 			}
@@ -174,6 +174,18 @@ func (c *Config) Run() (exitCode int) {
 	return
 }
 
+// getEnv returns the last instance of the environment variable.
+func getEnv(env []string, key string) string {
+	pre := key + "="
+	for i := len(env) - 1; i >= 0; i-- {
+		v := env[i]
+		if strings.HasPrefix(v, pre) {
+			return strings.TrimPrefix(v, pre)
+		}
+	}
+	return ""
+}
+
 func resetUsage(logger *log.Logger, fs *flag.FlagSet, name, args, longHelp string) {
 	var (
 		hasFlags   bool

cmd/dep/prune.go

@@ -59,8 +59,8 @@ func (cmd *pruneCommand) Run(ctx *dep.Ctx, args []string) error {
 	params := p.MakeParams()
 	params.RootPackageTree = ptree
 
-	if ctx.Loggers.Verbose {
-		params.TraceLogger = ctx.Loggers.Err
+	if ctx.Verbose {
+		params.TraceLogger = ctx.Err
 	}
 
 	s, err := gps.Prepare(params, sm)
@@ -77,8 +77,8 @@ func (cmd *pruneCommand) Run(ctx *dep.Ctx, args []string) error {
 	}
 
 	var pruneLogger *log.Logger
-	if ctx.Loggers.Verbose {
-		pruneLogger = ctx.Loggers.Err
+	if ctx.Verbose {
+		pruneLogger = ctx.Err
 	}
 	return dep.PruneProject(p, sm, pruneLogger)
 }

cmd/dep/root_analyzer.go

@@ -77,7 +77,7 @@ func (a *rootAnalyzer) importManifestAndLock(dir string, pr gps.ProjectRoot, sup
 
 	for _, i := range importers {
 		if i.HasDepMetadata(dir) {
-			a.ctx.Loggers.Err.Printf("Importing configuration from %s. These are only initial constraints, and are further refined during the solve process.", i.Name())
+			a.ctx.Err.Printf("Importing configuration from %s. These are only initial constraints, and are further refined during the solve process.", i.Name())
 			m, l, err := i.Import(dir, pr)
 			a.removeTransitiveDependencies(m)
 			return m, l, err

cmd/dep/status.go

@@ -215,22 +215,22 @@ func (cmd *statusCommand) Run(ctx *dep.Ctx, args []string) error {
 		}
 	}
 
-	digestMismatch, hasMissingPkgs, err := runStatusAll(ctx.Loggers, out, p, sm)
+	digestMismatch, hasMissingPkgs, err := runStatusAll(ctx, out, p, sm)
 	if err != nil {
 		return err
 	}
 
 	if digestMismatch {
 		if hasMissingPkgs {
-			ctx.Loggers.Err.Printf("Lock inputs-digest mismatch due to the following packages missing from the lock:\n\n")
-			ctx.Loggers.Out.Print(buf.String())
-			ctx.Loggers.Err.Printf("\nThis happens when a new import is added. Run `dep ensure` to install the missing packages.\n")
+			ctx.Err.Printf("Lock inputs-digest mismatch due to the following packages missing from the lock:\n\n")
+			ctx.Out.Print(buf.String())
+			ctx.Err.Printf("\nThis happens when a new import is added. Run `dep ensure` to install the missing packages.\n")
 		} else {
-			ctx.Loggers.Err.Printf("Lock inputs-digest mismatch. This happens when Gopkg.toml is modified.\n" +
+			ctx.Err.Printf("Lock inputs-digest mismatch. This happens when Gopkg.toml is modified.\n" +
 				"Run `dep ensure` to regenerate the inputs-digest.")
 		}
 	} else {
-		ctx.Loggers.Out.Print(buf.String())
+		ctx.Out.Print(buf.String())
 	}
 
 	return nil
@@ -253,7 +253,7 @@ type MissingStatus struct {
 	MissingPackages []string
 }
 
-func runStatusAll(loggers *dep.Loggers, out outputter, p *dep.Project, sm gps.SourceManager) (bool, bool, error) {
+func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceManager) (bool, bool, error) {
 	var digestMismatch, hasMissingPkgs bool
 
 	if p.Lock == nil {
@@ -276,8 +276,8 @@ func runStatusAll(loggers *dep.Loggers, out outputter, p *dep.Project, sm gps.So
 		Manifest:        p.Manifest,
 		// Locks aren't a part of the input hash check, so we can omit it.
 	}
-	if loggers.Verbose {
-		params.TraceLogger = loggers.Err
+	if ctx.Verbose {
+		params.TraceLogger = ctx.Err
 	}
 
 	s, err := gps.Prepare(params, sm)
@@ -412,9 +412,9 @@ func runStatusAll(loggers *dep.Loggers, out outputter, p *dep.Project, sm gps.So
 		// TODO this is just a fix quick so staticcheck doesn't complain.
 		// Visually reconciling failure to deduce project roots with the rest of
 		// the mismatch output is a larger problem.
-		loggers.Err.Printf("Failed to deduce project roots for import paths:\n")
+		ctx.Err.Printf("Failed to deduce project roots for import paths:\n")
 		for _, fail := range errs {
-			loggers.Err.Printf("\t%s: %s\n", fail.ex, fail.err.Error())
+			ctx.Err.Printf("\t%s: %s\n", fail.ex, fail.err.Error())
 		}
 
 		return digestMismatch, hasMissingPkgs, errors.New("address issues with undeducible import paths to get more status information")