1 files changed, 93 insertions, 0 deletions
diff --git a/lib/build/parse.go b/lib/build/parse.go
new file mode 100644
index 0000000000..d130b099be
--- /dev/null
+++ b/lib/build/parse.go
@@ -0,0 +1,93 @@
+// Copyright (C) 2019 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package build
+
+import (
+	"errors"
+	"regexp"
+	"strings"
+)
+
+// syncthing v1.1.4-rc.1+30-g6aaae618-dirty-crashrep "Erbium Earthworm" (go1.12.5 darwin-amd64) jb@kvin.kastelo.net 2019-05-23 16:08:14 UTC [foo, bar]
+// or, somewhere along the way the "+" in the version tag disappeared:
+// syncthing v1.23.7-dev.26.gdf7b56ae.dirty-stversionextra "Fermium Flea" (go1.20.5 darwin-arm64) jb@ok.kastelo.net 2023-07-12 06:55:26 UTC [Some Wrapper, purego, stnoupgrade]
+var (
+	longVersionRE = regexp.MustCompile(`syncthing\s+(v[^\s]+)\s+"([^"]+)"\s\(([^\s]+)\s+([^-]+)-([^)]+)\)\s+([^\s]+)[^\[]*(?:\[(.+)\])?$`)
+	gitExtraRE    = regexp.MustCompile(`\.\d+\.g[0-9a-f]+`) // ".1.g6aaae618"
+	gitExtraSepRE = regexp.MustCompile(`[.-]`)              // dot or dash
+)
+
+type VersionParts struct {
+	Version  string   // "v1.1.4-rc.1+30-g6aaae618-dirty-crashrep"
+	Tag      string   // "v1.1.4-rc.1"
+	Commit   string   // "6aaae618", blank when absent
+	Codename string   // "Erbium Earthworm"
+	Runtime  string   // "go1.12.5"
+	GOOS     string   // "darwin"
+	GOARCH   string   // "amd64"
+	Builder  string   // "jb@kvin.kastelo.net"
+	Extra    []string // "foo", "bar"
+}
+
+func (v VersionParts) Environment() string {
+	if v.Commit != "" {
+		return "Development"
+	}
+	if strings.Contains(v.Tag, "-rc.") {
+		return "Candidate"
+	}
+	if strings.Contains(v.Tag, "-") {
+		return "Beta"
+	}
+	return "Stable"
+}
+
+func ParseVersion(line string) (VersionParts, error) {
+	m := longVersionRE.FindStringSubmatch(line)
+	if len(m) == 0 {
+		return VersionParts{}, errors.New("unintelligeble version string")
+	}
+
+	v := VersionParts{
+		Version:  m[1],
+		Codename: m[2],
+		Runtime:  m[3],
+		GOOS:     m[4],
+		GOARCH:   m[5],
+		Builder:  m[6],
+	}
+
+	// Split the version tag into tag and commit. This is old style
+	// v1.2.3-something.4+11-g12345678 or newer with just dots
+	// v1.2.3-something.4.11.g12345678 or v1.2.3-dev.11.g12345678.
+	parts := []string{v.Version}
+	if strings.Contains(v.Version, "+") {
+		parts = strings.Split(v.Version, "+")
+	} else {
+		idxs := gitExtraRE.FindStringIndex(v.Version)
+		if len(idxs) > 0 {
+			parts = []string{v.Version[:idxs[0]], v.Version[idxs[0]+1:]}
+		}
+	}
+	v.Tag = parts[0]
+	if len(parts) > 1 {
+		fields := gitExtraSepRE.Split(parts[1], -1)
+		if len(fields) >= 2 && strings.HasPrefix(fields[1], "g") {
+			v.Commit = fields[1][1:]
+		}
+	}
+
+	if len(m) >= 8 && m[7] != "" {
+		tags := strings.Split(m[7], ",")
+		for i := range tags {
+			tags[i] = strings.TrimSpace(tags[i])
+		}
+		v.Extra = tags
+	}
+
+	return v, nil
+}