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package cmd
import "fmt"
type bash struct{}
// Bash shell instance
var Bash Shell = bash{}
const bashHook = `
_direnv_hook() {
local previous_exit_status=$?;
trap -- '' SIGINT;
eval "$("{{.SelfPath}}" export bash)";
trap - SIGINT;
return $previous_exit_status;
};
if [[ ";${PROMPT_COMMAND[*]:-};" != *";_direnv_hook;"* ]]; then
if [[ "$(declare -p PROMPT_COMMAND 2>&1)" == "declare -a"* ]]; then
PROMPT_COMMAND=(_direnv_hook "${PROMPT_COMMAND[@]}")
else
PROMPT_COMMAND="_direnv_hook${PROMPT_COMMAND:+;$PROMPT_COMMAND}"
fi
fi
`
func (sh bash) Hook() (string, error) {
return bashHook, nil
}
func (sh bash) Export(e ShellExport) (string, error) {
var out string
for key, value := range e {
if value == nil {
out += sh.unset(key)
} else {
out += sh.export(key, *value)
}
}
return out, nil
}
func (sh bash) Dump(env Env) (string, error) {
var out string
for key, value := range env {
out += sh.export(key, value)
}
return out, nil
}
func (sh bash) export(key, value string) string {
return "export " + sh.escape(key) + "=" + sh.escape(value) + ";"
}
func (sh bash) unset(key string) string {
return "unset " + sh.escape(key) + ";"
}
func (sh bash) escape(str string) string {
return BashEscape(str)
}
/*
* Escaping
*/
// nolint
const (
ACK = 6
TAB = 9
LF = 10
CR = 13
US = 31
SPACE = 32
AMPERSTAND = 38
SINGLE_QUOTE = 39
STAR = 42
PLUS = 43
NINE = 57
COLON = 58
EQUALS = 61
QUESTION = 63
UPPERCASE_Z = 90
OPEN_BRACKET = 91
BACKSLASH = 92
UNDERSCORE = 95
CLOSE_BRACKET = 93
BACKTICK = 96
LOWERCASE_Z = 122
OPEN_CURLY_BRACE = 123
CLOSE_CURLY_BRACE = 125
TILDE = 126
DEL = 127
)
// BashEscape escapes strings for safe use in Bash.
// Based on https://github.com/solidsnack/shell-escape/blob/master/Text/ShellEscape/Bash.hs
/*
A Bash escaped string. The strings are wrapped in @$\'...\'@ if any
bytes within them must be escaped; otherwise, they are left as is.
Newlines and other control characters are represented as ANSI escape
sequences. High bytes are represented as hex codes. Thus Bash escaped
strings will always fit on one line and never contain non-ASCII bytes.
*/
func BashEscape(str string) string {
if str == "" {
return "''"
}
in := []byte(str)
out := ""
i := 0
l := len(in)
escape := false
hex := func(char byte) {
escape = true
out += fmt.Sprintf("\\x%02x", char)
}
backslash := func(char byte) {
escape = true
out += string([]byte{BACKSLASH, char})
}
escaped := func(str string) {
escape = true
out += str
}
quoted := func(char byte) {
escape = true
out += string([]byte{char})
}
literal := func(char byte) {
out += string([]byte{char})
}
for i < l {
char := in[i]
switch {
case char == ACK:
hex(char)
case char == TAB:
escaped(`\t`)
case char == LF:
escaped(`\n`)
case char == CR:
escaped(`\r`)
case char <= US:
hex(char)
case char <= AMPERSTAND:
quoted(char)
case char == SINGLE_QUOTE:
backslash(char)
case char <= PLUS:
quoted(char)
case char <= NINE:
literal(char)
case char <= QUESTION:
quoted(char)
case char <= UPPERCASE_Z:
literal(char)
case char == OPEN_BRACKET:
quoted(char)
case char == BACKSLASH:
backslash(char)
case char == UNDERSCORE:
literal(char)
case char <= CLOSE_BRACKET:
quoted(char)
case char <= BACKTICK:
quoted(char)
case char <= TILDE:
quoted(char)
case char == DEL:
hex(char)
default:
hex(char)
}
i++
}
if escape {
out = "$'" + out + "'"
}
return out
}
|
