get.go

@@ -1,7 +1,6 @@
 package binfo
 
 import (
-	"errors"
 	"fmt"
 	"runtime/debug"
 	"strconv"
@@ -11,23 +10,17 @@ import (
 )
 
 func Get() (Binfo, error) {
-	o, ok := debug.ReadBuildInfo()
-	if !ok {
-		return Binfo{}, errors.New("unable to read build info")
-	}
-
 	var merr *multierror.Error
 
 	b := Binfo{}
 
+	if o, ok := debug.ReadBuildInfo(); ok {
 		b.Orig = o
 
 		b.Module.Version = o.Main.Version
 		b.Module.Path = o.Main.Path
 		b.Module.Sum = o.Main.Sum
 
-	b.Build.GoVersion = o.GoVersion
-
 		for _, setting := range o.Settings {
 			switch setting.Key {
 			case "-buildmode":
@@ -75,6 +68,7 @@ func Get() (Binfo, error) {
 				b.VCS.Modified = v
 			}
 		}
+	}
 
 	return b, merr.ErrorOrNil()
 }

summary.go

@@ -1,40 +1,18 @@
 package binfo
 
 import (
-	_ "embed"
+	"fmt"
 	"strings"
-	"text/template"
 )
 
 type SummaryMode uint
 
 const (
-	Module SummaryMode = 1 << iota
+	ModeModule SummaryMode = 1 << iota
-	Build
+	ModeBuild
-	CGO
+	ModeCGO
-	VCS
+	ModeVCS
-	Multiline
+	ModeMultiline
-)
-
-type params struct {
-	Name    string
-	Version string
-
-	Module bool
-	Build  bool
-	CGO    bool
-	VCS    bool
-
-	Brk string
-	Sep string
-
-	I Binfo
-}
-
-var (
-	//go:embed summary.tmpl
-	st   string
-	t, _ = template.New("").Parse(st)
 )
 
 func (b Binfo) Summarize(name string, version string, mode SummaryMode) string {
@@ -47,7 +25,7 @@ func (b Binfo) Summarize(name string, version string, mode SummaryMode) string {
 		sep string
 	)
 
-	if wants(Multiline) {
+	if wants(ModeMultiline) {
 		brk = "\n"
 		sep = "\n"
 	} else {
@@ -55,24 +33,48 @@ func (b Binfo) Summarize(name string, version string, mode SummaryMode) string {
 		sep = ", "
 	}
 
-	sb := new(strings.Builder)
+	lines := make([]string, 4)
-	err := t.Execute(sb, params{
-		Name:    name,
-		Version: version,
 
-		Module: wants(Module),
+	if wants(ModeModule) {
-		Build:  wants(Build),
+		lines = append(
-		CGO:    wants(CGO),
+			lines,
-		VCS:    wants(VCS),
+			fmt.Sprintf("module %s (%s) (sum %s)", b.Module.Path, b.Module.Version, b.Module.Sum),
-
+		)
-		Brk: brk,
-		Sep: sep,
-
-		I: b,
-	})
-	if err != nil {
-		return ""
 	}
 
-	return sb.String()
+	if wants(ModeBuild) {
+		lines = append(
+			lines,
+			fmt.Sprintf("built with %s (%s) (mode %s)", b.Build.Compiler, b.Build.GoVersion, b.Build.Mode),
+		)
+	}
+
+	if wants(ModeCGO) {
+		if b.CGO.Enabled {
+			lines = append(
+				lines,
+				fmt.Sprintf("with cgo (c %q) (cpp %q) (cxx %q) (ld %q)", b.CGO.Flags.C, b.CGO.Flags.CPP, b.CGO.Flags.CXX, b.CGO.Flags.LD),
+			)
+		} else {
+			lines = append(
+				lines,
+				"without cgo",
+			)
+		}
+	}
+
+	if wants(ModeVCS) {
+		lines = append(
+			lines,
+			fmt.Sprintf("via %s (rev %s) (at %s)", b.VCS.Name, b.VCS.Revision, b.VCS.Time.Format("2006-01-02 15:04:05")),
+		)
+	}
+
+	j := strings.Join(lines, sep)
+
+	if name == "" {
+		return j
+	} else {
+		return fmt.Sprintf("%s %s:%s%s", name, version, brk, j)
+	}
 }

summary.tmpl

@@ -1,40 +0,0 @@
-{{- if ne .Name "" -}}
-	{{ .Name }}{{ if ne .Version "" }} {{ .Version }}{{ end }}
-	{{- .Brk -}}
-{{- end -}}
-
-{{- if .Module -}}
-	module {{ .I.Module.Path }} {{ .I.Module.Version }}{{ if ne .I.Module.Sum "" }} {{ .I.Module.Sum }}{{ end }}
-{{- end -}}
-
-{{- .Sep -}}
-
-{{- if .Build -}}
-	built with {{ .I.Build.Compiler }} ({{ .I.Build.GoVersion }}) ({{ .I.Build.Mode }})
-{{- end -}}
-
-{{- .Sep -}}
-
-{{- if .CGO -}}
-	{{- if .I.CGO.Enabled -}}
-		with cgo
-		{{- if ne .I.CGO.Flags.C "" }} (c {{ .I.CGO.Flags.C }}){{- end -}}
-		{{- if ne .I.CGO.Flags.CPP "" }} (cpp {{ .I.CGO.Flags.CPP }}){{- end -}}
-		{{- if ne .I.CGO.Flags.CXX "" }} (cxx {{ .I.CGO.Flags.CXX }}){{- end -}}
-		{{- if ne .I.CGO.Flags.LD "" }} (ld {{ .I.CGO.Flags.LD }}){{- end -}}
-	{{- else -}}
-		without cgo
-	{{- end -}}
-{{- end -}}
-
-{{- .Sep -}}
-
-{{- if .VCS -}}
-	{{- $time := .I.VCS.Time.Format "2006-01-02 15:04:05" -}}
-
-	vcs
-	{{- if ne .I.VCS.Name "" }} {{ .I.VCS.Name }}{{- end -}}
-	{{- if ne .I.VCS.Revision "" }} (revision {{ .I.VCS.Revision }}){{- end -}}
-	{{- if ne $time "" }} (at {{ $time }}){{- end -}}
-	{{- if .I.VCS.Modified }} (modified){{- end -}}
-{{- end -}}