Re-wrote from scratch in Golang

- Re-implemented the project in Golang, and deprecated Python entirely
- Implemented several new, long-requested features
- Refactored cheatsheets into a separate repository

internal/config/config.go

@@ -0,0 +1,74 @@
+package config
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	cp "github.com/cheat/cheat/internal/cheatpath"
+
+	"github.com/mitchellh/go-homedir"
+	"gopkg.in/yaml.v2"
+)
+
+// Config encapsulates configuration parameters
+type Config struct {
+	Colorize   bool           `yaml:colorize`
+	Editor     string         `yaml:editor`
+	Cheatpaths []cp.Cheatpath `yaml:cheatpaths`
+	Style      string         `yaml:style`
+	Formatter  string         `yaml:formatter`
+}
+
+// New returns a new Config struct
+func New(opts map[string]interface{}, confPath string) (Config, error) {
+
+	// read the config file
+	buf, err := ioutil.ReadFile(confPath)
+	if err != nil {
+		return Config{}, fmt.Errorf("could not read config file: %v", err)
+	}
+
+	// initialize a config object
+	conf := Config{}
+
+	// unmarshal the yaml
+	err = yaml.UnmarshalStrict(buf, &conf)
+	if err != nil {
+		return Config{}, fmt.Errorf("could not unmarshal yaml: %v", err)
+	}
+
+	// expand ~ in config paths
+	for i, cheatpath := range conf.Cheatpaths {
+
+		expanded, err := homedir.Expand(cheatpath.Path)
+		if err != nil {
+			return Config{}, fmt.Errorf("failed to expand ~: %v", err)
+		}
+
+		conf.Cheatpaths[i].Path = expanded
+	}
+
+	// if an editor was not provided in the configs, look to envvars
+	if conf.Editor == "" {
+		if os.Getenv("VISUAL") != "" {
+			conf.Editor = os.Getenv("VISUAL")
+		} else if os.Getenv("EDITOR") != "" {
+			conf.Editor = os.Getenv("EDITOR")
+		} else {
+			return Config{}, fmt.Errorf("no editor set")
+		}
+	}
+
+	// if a chroma style was not provided, set a default
+	if conf.Style == "" {
+		conf.Style = "bw"
+	}
+
+	// if a chroma formatter was not provided, set a default
+	if conf.Formatter == "" {
+		conf.Formatter = "terminal16m"
+	}
+
+	return conf, nil
+}