cheat/internal/config/config.go

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package config
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
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, resolve bool) (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)
}
// if a .cheat directory exists locally, append it to the cheatpaths
cwd, err := os.Getwd()
if err != nil {
return Config{}, fmt.Errorf("failed to get cwd: %v", err)
}
local := filepath.Join(cwd, ".cheat")
if _, err := os.Stat(local); err == nil {
path := cp.Cheatpath{
Name: "cwd",
Path: local,
ReadOnly: false,
Tags: []string{},
}
conf.Cheatpaths = append(conf.Cheatpaths, path)
}
// process cheatpaths
for i, cheatpath := range conf.Cheatpaths {
// expand ~ in config paths
expanded, err := homedir.Expand(cheatpath.Path)
if err != nil {
return Config{}, fmt.Errorf("failed to expand ~: %v", err)
}
// follow symlinks
//
// NB: `resolve` is an ugly kludge that exists for the sake of unit-tests.
// It's necessary because `EvalSymlinks` will error if the symlink points
// to a non-existent location on the filesystem. When unit-testing,
// however, we don't want to have dependencies on the filesystem. As such,
// `resolve` is a switch that allows us to turn off symlink resolution when
// running the config tests.
if resolve {
expanded, err = filepath.EvalSymlinks(expanded)
if err != nil {
return Config{}, fmt.Errorf(
"failed to resolve symlink: %s, %v",
expanded,
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
}