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chore: merge branch 'v2-exp' into v2-generics
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,18 +1,72 @@ | ||
| package tea | ||
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| import "strings" | ||
| import ( | ||
| "strings" | ||
| ) | ||
|
|
||
| // environ is a slice of strings that represents the environment variables of | ||
| // the program. | ||
| type environ []string | ||
|
|
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| // getenv is a function that returns the value of the environment variable named | ||
| // by the key. If the variable is not present in the environment, the value | ||
| // returned will be the empty string. | ||
| // This function traverses the environment variables in reverse order, so that | ||
| // the last value set for the key is the one returned. | ||
| func (p *Program[T]) getenv(key string) (v string) { | ||
| for i := len(p.environ) - 1; i >= 0; i-- { | ||
| if strings.HasPrefix(p.environ[i], key+"=") { | ||
| v = strings.TrimPrefix(p.environ[i], key+"=") | ||
| return p.environ.Getenv(key) | ||
| } | ||
|
|
||
| // Getenv returns the value of the environment variable named by the key. If | ||
| // the variable is not present in the environment, the value returned will be | ||
| // the empty string. | ||
| func (p environ) Getenv(key string) (v string) { | ||
| v, _ = p.LookupEnv(key) | ||
| return | ||
| } | ||
|
|
||
| // LookupEnv retrieves the value of the environment variable named by the key. | ||
| // If the variable is present in the environment the value (which may be empty) | ||
| // is returned and the boolean is true. Otherwise the returned value will be | ||
| // empty and the boolean will be false. | ||
| func (p environ) LookupEnv(key string) (s string, v bool) { | ||
| for i := len(p) - 1; i >= 0; i-- { | ||
| if strings.HasPrefix(p[i], key+"=") { | ||
| s = strings.TrimPrefix(p[i], key+"=") | ||
| v = true | ||
| break | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // EnvMsg is a message that represents the environment variables of the | ||
| // program. This is useful for getting the environment variables of programs | ||
| // running in a remote session like SSH. In that case, using [os.Getenv] would | ||
| // return the server's environment variables, not the client's. | ||
| // | ||
| // This message is sent to the program when it starts. | ||
| // | ||
| // Example: | ||
| // | ||
| // switch msg := msg.(type) { | ||
| // case EnvMsg: | ||
| // // What terminal type is being used? | ||
| // term := msg.Getenv("TERM") | ||
| // } | ||
| type EnvMsg environ | ||
|
|
||
| // Getenv returns the value of the environment variable named by the key. If | ||
| // the variable is not present in the environment, the value returned will be | ||
| // the empty string. | ||
| func (msg EnvMsg) Getenv(key string) (v string) { | ||
| return environ(msg).Getenv(key) | ||
| } | ||
|
|
||
| // LookupEnv retrieves the value of the environment variable named by the key. | ||
| // If the variable is present in the environment the value (which may be empty) | ||
| // is returned and the boolean is true. Otherwise the returned value will be | ||
| // empty and the boolean will be false. | ||
| func (msg EnvMsg) LookupEnv(key string) (s string, v bool) { | ||
| return environ(msg).LookupEnv(key) | ||
| } |
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