/
types.go
100 lines (83 loc) · 1.93 KB
/
types.go
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package env
import (
"time"
"unicode"
"github.com/xo/terminfo"
"github.com/xo/usql/text"
)
// Vars is a map of variables.
type Vars map[string]string
// Set sets a variable name.
func (v Vars) Set(name, value string) {
v[name] = value
}
// Unset unsets a variable name.
func (v Vars) Unset(name string) {
delete(v, name)
}
// All returns all variables as a map.
func (v Vars) All() map[string]string {
return map[string]string(v)
}
var vars Vars
func init() {
// get USQL_* variables
enableHostInformation := "true"
if v := Getenv("USQL_SHOW_HOST_INFORMATION"); v != "" {
enableHostInformation = v
}
timefmt := time.RFC3339Nano
if v := Getenv("USQL_TIME_FORMAT"); v != "" {
timefmt = v
}
// get color level
colorLevel, _ := terminfo.ColorLevelFromEnv()
enableSyntaxHL := "true"
if colorLevel < terminfo.ColorLevelBasic {
enableSyntaxHL = "false"
}
vars = Vars{
// usql related logic
"SHOW_HOST_INFORMATION": enableHostInformation,
"TIME_FORMAT": timefmt,
// syntax highlighting variables
"SYNTAX_HL": enableSyntaxHL,
"SYNTAX_HL_FORMAT": colorLevel.ChromaFormatterName(),
"SYNTAX_HL_STYLE": "monokai",
"SYNTAX_HL_OVERRIDE_BG": "true",
}
}
// ValidIdentifier returns an error when n is not a valid identifier.
func ValidIdentifier(n string) error {
r := []rune(n)
rlen := len(r)
if rlen < 1 {
return text.ErrInvalidIdentifier
}
for i := 0; i < rlen; i++ {
if c := r[i]; c != '_' && !unicode.IsLetter(c) && !unicode.IsNumber(c) {
return text.ErrInvalidIdentifier
}
}
return nil
}
// Set sets a variable.
func Set(name, value string) error {
if err := ValidIdentifier(name); err != nil {
return err
}
vars.Set(name, value)
return nil
}
// Unset unsets a variable.
func Unset(name string) error {
if err := ValidIdentifier(name); err != nil {
return err
}
vars.Unset(name)
return nil
}
// All returns all variables.
func All() map[string]string {
return vars
}