feat: add support for exported bash functions

Author: Jose Diaz-Gonzalez

basher.go

@@ -2,6 +2,7 @@
 package basher
 
 import (
+	"fmt"
 	"io"
 	"io/ioutil"
 	"log"
@@ -223,6 +224,14 @@ func (c *Context) buildEnvfile() (string, error) {
 			continue
 		}
 
+		if isBashFunc(pair[0], pair[1]) {
+			bash_function_name := strings.TrimPrefix(pair[0], "BASH_FUNC_")
+			bash_function_name = strings.TrimSuffix(bash_function_name, "%%")
+			file.Write([]byte(fmt.Sprintf("%s%s\n", bash_function_name, pair[1])))
+			file.Write([]byte(fmt.Sprintf("export -f %s\n", bash_function_name)))
+			continue
+		}
+
 		file.Write([]byte("export " + strings.Replace(
 			strings.Replace(kvp, "'", "\\'", -1), "=", "=$'", 1) + "'\n"))
 	}
@@ -237,6 +246,10 @@ func (c *Context) buildEnvfile() (string, error) {
 	return file.Name(), nil
 }
 
+func isBashFunc(key string, value string) bool {
+	return strings.HasPrefix(key, "BASH_FUNC_") && strings.HasPrefix(value, "()")
+}
+
 // Runs a command in Bash from this Context. With each call, a temporary file
 // is generated used as BASH_ENV when calling Bash that includes all variables,
 // sourced scripts, and exported functions from the Context. Standard I/O by

basher_test.go

@@ -138,3 +138,24 @@ func TestOddArgs(t *testing.T) {
 		t.Fatal("unexpected stdout:", stdout.String())
 	}
 }
+
+func TestIsBashFunc(t *testing.T) {
+	if isBashFunc("", "") {
+		t.Fatal("empty string is not a bash func")
+	}
+
+	if isBashFunc("key", "value") {
+		t.Fatal("key=value is not a bash func")
+	}
+
+	if isBashFunc("BASH_FUNC_readlinkf", "value") {
+		t.Fatal("key does not end with %%")
+	}
+
+	if isBashFunc("BASH_FUNC_readlinkf%%", "value") {
+		t.Fatal("value does not begin with ()")
+	}
+	if !isBashFunc("BASH_FUNC_readlinkf%%", "() { true }") {
+		t.Fatal("bash func should be detected")
+	}
+}