From 353ef0da17f4e1b59b1608645acb687af42f2822 Mon Sep 17 00:00:00 2001
From: Don <don.j.olmstead@gmail.com>
Date: Mon, 9 Sep 2019 14:26:56 -0700
Subject: [PATCH] Add SemVer struct

---
 pkg/plugin/env.go   | 21 +++++++++++++++++++++
 pkg/plugin/types.go | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/pkg/plugin/env.go b/pkg/plugin/env.go
index 1418d9d..99d2c29 100644
--- a/pkg/plugin/env.go
+++ b/pkg/plugin/env.go
@@ -88,6 +88,27 @@ const (
 	StepNameEnvVar = "DRONE_STEP_NAME"
 	// StepNumberEnvVar corresponds to Step.Number.
 	StepNumberEnvVar = "DRONE_STEP_NUMBER"
+
+	//---------------------------------------------------------------------
+	// SemVer Variables
+	//---------------------------------------------------------------------
+
+	// SemVerBuildEnvVar corresponds to SemVer.Build.
+	SemVerBuildEnvVar = "DRONE_SEMVER_BUILD"
+	// SemVerErrorEnvVar corresponds to SemVer.Error.
+	SemVerErrorEnvVar = "DRONE_SEMVER_ERROR"
+	// SemVerMajorEnvVar corresponds to SemVer.Major.
+	SemVerMajorEnvVar = "DRONE_SEMVER_MAJOR"
+	// SemVerMinorEnvVar corresponds to SemVer.Minor.
+	SemVerMinorEnvVar = "DRONE_SEMVER_MINOR"
+	// SemVerPatchEnvVar corresponds to SemVer.Patch.
+	SemVerPatchEnvVar = "DRONE_SEMVER_PATCH"
+	// SemVerPrereleaseEnvVar corresponds to SemVer.Prerelease
+	SemVerPrereleaseEnvVar = "DRONE_SEMVER_PRERELEASE"
+	// SemVerShortEnvVar corresponds to SemVer.Short.
+	SemVerShortEnvVar = "DRONE_SEMVER_SHORT"
+	// SemVerVersionEnvVar corresponds to SemVer.Version
+	SemVerVersionEnvVar = "DRONE_SEMVER"
 )
 
 // StringEnvVar gets the environment variable's value.
diff --git a/pkg/plugin/types.go b/pkg/plugin/types.go
index ad11a3a..1feed8d 100644
--- a/pkg/plugin/types.go
+++ b/pkg/plugin/types.go
@@ -99,6 +99,32 @@ type (
 		Name   string
 		Number int
 	}
+
+	// SemVer represents the semantic version of the currently running build.
+	//
+	// This value is only applicable for tags. If the tag cannot be parsed into
+	// a semantic version then SemVer.Error will have the reason.
+	SemVer struct {
+		// Build version number.
+		//
+		// This is signified by a + at the end of the tag.
+		Build string
+		// Error is the semantic version parsing error if the tag was invalid.
+		Error string
+		// Major version number.
+		Major string
+		// Minor version number.
+		Minor string
+		// Patch version number.
+		Patch string
+		// Prerelease version.
+		Prerelease string
+		// Short version of the semantic version string where labels and
+		// metadata are truncated.
+		Short string
+		// Version is the full semantic version.
+		Version string
+	}
 )
 
 // RepoFromEnv creates a Repo from the environment variables used by Drone.
@@ -142,3 +168,17 @@ func StepFromEnv() Step {
 		Number: IntEnvVar(StepNumberEnvVar),
 	}
 }
+
+// SemVerFromEnv creates a SemVer from the environment variables used by Drone.
+func SemVerFromEnv() SemVer {
+	return SemVer{
+		Build:      StringEnvVar(SemVerBuildEnvVar),
+		Error:      StringEnvVar(SemVerErrorEnvVar),
+		Major:      StringEnvVar(SemVerMajorEnvVar),
+		Minor:      StringEnvVar(SemVerMinorEnvVar),
+		Patch:      StringEnvVar(SemVerPatchEnvVar),
+		Prerelease: StringEnvVar(SemVerPrereleaseEnvVar),
+		Short:      StringEnvVar(SemVerShortEnvVar),
+		Version:    StringEnvVar(SemVerVersionEnvVar),
+	}
+}