feat: add inline and block runner. Improve execution error handling

types.go

@@ -3,7 +3,10 @@ package main
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
+	"os/exec"
+	"strings"
 	"text/template"
 )
 
@@ -40,3 +43,34 @@ type ParamSpec struct {
 }
 
 type TemplateContext map[string]string
+
+func (ctx TemplateContext) run(command string) (string, error) {
+	cmd := exec.Command("sh", "-c", command)
+	var stdout bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stdout
+	for k, v := range ctx {
+		cmd.Env = append(cmd.Env, k+"="+v)
+	}
+	err := cmd.Run()
+	if err != nil {
+		return "", errors.New(stdout.String())
+	}
+	return stdout.String(), nil
+}
+
+func (ctx TemplateContext) codeBlock(command string) string {
+	out, err := ctx.run(command)
+	if err != nil {
+		return fmt.Sprintf("> Failed to execute the command:\n> `%s`\n> %s\n", command, err.Error())
+	}
+	return fmt.Sprintf("\n```\n%s\n```\n", out)
+}
+
+func (ctx TemplateContext) inline(command string) string {
+	out, err := ctx.run(command)
+	if err != nil {
+		return fmt.Sprintf("`Failed to execute the command: '%s'. %s`", command, err.Error())
+	}
+	return fmt.Sprintf("`%s`", strings.Trim(out, "\n "))
+}