update library error msg

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/konoui/go-alfred v0.0.0-20200104065011-50d164695438
 	github.com/mattn/go-shellwords v1.0.6
 	github.com/mitchellh/go-homedir v1.1.0
+	github.com/pkg/errors v0.9.1
 	github.com/sahilm/fuzzy v0.1.0
 	github.com/spf13/cobra v0.0.5
 )

go.sum

@@ -19,6 +19,8 @@ github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
 github.com/sahilm/fuzzy v0.1.0 h1:FzWGaw2Opqyu+794ZQ9SYifWv2EIXpwP4q8dY1kDAwI=

pkg/tldr/fuzzy.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/pkg/errors"
 	"github.com/sahilm/fuzzy"
 )
 
@@ -58,9 +59,10 @@ func (c Cmds) Search(args []string) Cmds {
 
 // LoadIndexFile load command index file
 func (t *Tldr) LoadIndexFile() (*CmdsIndex, error) {
-	f, err := os.Open(filepath.Join(t.path, t.indexFile))
+	path := filepath.Join(t.path, t.indexFile)
+	f, err := os.Open(path)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "failed to open index file")
 	}
 	defer f.Close()
 

pkg/tldr/pages.go

@@ -6,6 +6,8 @@ import (
 	"path/filepath"
 	"strings"
 	"time"
+
+	"github.com/pkg/errors"
 )
 
 const (
@@ -57,15 +59,15 @@ func (t *Tldr) OnInitialize() error {
 	initUpdate := false
 	if !pathExists(t.path) {
 		if err := os.Mkdir(t.path, 0755); err != nil {
-			return err
+			return errors.Wrap(err, "failed to create tldr dir")
 		}
 		// automatically updated if indexfile does not exist
 		initUpdate = true
 	}
 
 	if t.update || initUpdate {
 		if err := t.Update(); err != nil {
-			return err
+			return errors.Wrap(err, "failed to update tldr repository")
 		}
 	}
 
@@ -76,16 +78,16 @@ func (t *Tldr) OnInitialize() error {
 func (t *Tldr) Update() error {
 	_, err := download(t.indexSourceURL, t.path, t.indexFile)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "failed to download index file")
 	}
 
 	zipPath, err := download(t.pageSourceURL, t.path, t.zipFile)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "failed to download tldr repository")
 	}
 
 	if err := unzip(zipPath, t.path); err != nil {
-		return err
+		return errors.Wrap(err, "failed to unzip tldr repository")
 	}
 
 	return nil
@@ -103,7 +105,7 @@ func (t *Tldr) FindPage(cmds []string) (*Page, error) {
 
 		f, err := os.Open(path)
 		if err != nil {
-			return &Page{}, err
+			return &Page{}, errors.Wrap(err, "failed to open page: "+f.Name())
 		}
 		defer f.Close()