Print ERROR on theme vs Hugo version mismatch

Fixes #1070

diff --git a/commands/hugo.go b/commands/hugo.go
index b9afb3ec06a7dcaba2df007d3f2cbe4bc09ca9b7..6d4750165c1ad25589c222e8be2107aaa2a5ba3a 100644 (file)
--- a/commands/hugo.go
+++ b/commands/hugo.go
@@ -251,6 +251,12 @@ func InitializeConfig() {
        }
 
        jww.INFO.Println("Using config file:", viper.ConfigFileUsed())
+
+       themeVersionMismatch, minVersion := helpers.IsThemeVsHugoVersionMismatch()
+       if themeVersionMismatch {
+               jww.ERROR.Printf("Current theme does not support Hugo version %s. Minimum version required is %s\n",
+                       helpers.HugoReleaseVersion(), minVersion)
+       }
 }
 
 func build(watches ...bool) {

diff --git a/helpers/hugo.go b/helpers/hugo.go
index ab840a2d749691a95a52416600894afd6fa55193..d20a0e34e3f773de9ea2a3b66b2c09c34c8913ff 100644 (file)
--- a/helpers/hugo.go
+++ b/helpers/hugo.go
@@ -15,6 +15,10 @@ package helpers
 
 import (
        "fmt"
+       "github.com/spf13/hugo/hugofs"
+       "github.com/spf13/hugo/parser"
+       "io/ioutil"
+       "path/filepath"
 )
 
 // this should be the only one
@@ -44,3 +48,61 @@ func hugoVersion(version float32, suffix string) string {
 func hugoVersionNoSuffix(version float32) string {
        return fmt.Sprintf("%.2g", version)
 }
+
+// IsThemeVsHugoVersionMismatch returns whether the current Hugo version is < theme's min_version
+func IsThemeVsHugoVersionMismatch() (mismatch bool, requiredMinVersion string) {
+       if !ThemeSet() {
+               return
+       }
+
+       themeDir, err := getThemeDirPath("")
+
+       if err != nil {
+               return
+       }
+
+       fs := hugofs.SourceFs
+       path := filepath.Join(themeDir, "theme.toml")
+
+       exists, err := Exists(path, fs)
+
+       if err != nil || !exists {
+               return
+       }
+
+       f, err := fs.Open(path)
+
+       if err != nil {
+               return
+       }
+
+       defer f.Close()
+
+       b, err := ioutil.ReadAll(f)
+
+       if err != nil {
+               return
+       }
+
+       c, err := parser.HandleTOMLMetaData(b)
+
+       if err != nil {
+               return
+       }
+
+       config := c.(map[string]interface{})
+
+       if minVersion, ok := config["min_version"]; ok {
+               switch minVersion.(type) {
+               case float32:
+                       return hugoVersionMain < minVersion.(float32), fmt.Sprint(minVersion)
+               case float64:
+                       return hugoVersionMain < minVersion.(float64), fmt.Sprint(minVersion)
+               default:
+                       return
+               }
+
+       }
+
+       return
+}