How to use template functions in Go language to dynamically generate Word documents?

How to use template functions in Go language to dynamically generate Word documents?

With the advent of the information age, dynamically generating Word documents has become a common need for companies and individuals to process documents. As an efficient and concise programming language, Go language has built-in template functions that can help us quickly realize the function of dynamically generating Word documents. This article will introduce how to use template functions in the Go language to dynamically generate Word documents and provide relevant code examples.

1. Preparation
Before starting, we need to install the Go language environment and ensure that it is configured correctly. In addition, we also need to install a library for generating Word documents. It is recommended to use the github.com/unidoc/unioffice library. It is a powerful and easy-to-use Go language library that provides rich documentation. Generate and edit functions.

2. Introduction to template functions
In the Go language, template functions are functions that can be called and executed by the template engine and are used to perform data calculation, formatting and other operations in the template. Use template functions to achieve dynamic generation of Word documents.

The following are some commonly used template functions:

1. Format time: Time can be formatted through the functions provided by the time package. For example, {{ .StartTime.Format "2006-01-02" }} means formatting the .StartTime variable into the date format of "2006-01-02".
2. String interception: Use {{ substr .Content 0 100 }} to intercept the first 100 characters of the .Content variable.
3. String replacement: Strings can be replaced through the functions provided by the strings package. For example, {{ replace .Content "Go" "Golang" }} means replacing "Go" in the .Content variable with "Golang".
4. Number calculations: Use {{ add .Num1 .Num2 }} to add the values ​​of .Num1 and .Num2.

3. Code Example
The following is a simple code example that demonstrates how to use template functions to dynamically generate Word documents. Let's say we want to generate a simple report showing monthly sales statistics for our company. The code is as follows:

package main

import (
    "fmt"
    "os"
    "time"
    "text/template"

    "github.com/unidoc/unioffice/document"
)

type SalesData struct {
    Month   string
    Revenue float64
}

func main() {
    // 准备模板数据
    data := []SalesData{
        {"January", 10000},
        {"February", 15000},
        {"March", 20000},
    }

    // 加载模板文件
    tmpl, err := template.ParseFiles("template.docx")
    if err != nil {
        fmt.Println("Failed to load template:", err)
        return
    }

    // 创建Word文档
    doc := document.New()

    // 遍历数据生成内容
    for _, d := range data {
        // 执行模板函数并生成内容
        content := newContent(tmpl, d)

        // 添加内容到文档中
        doc.AddParagraph().AddRun().AddText(content)
    }

    // 保存文档
    err = doc.SaveToFile("sales_report.docx")
    if err != nil {
        fmt.Println("Failed to save document:", err)
        return
    }

    fmt.Println("Sales report generated successfully.")
}

// 执行模板函数并生成内容
func newContent(tmpl *template.Template, data SalesData) string {
    // 定义模板函数
    funcMap := template.FuncMap{
        "formatTime": func(t time.Time) string {
            return t.Format("2006-01-02")
        },
        "formatMoney": func(m float64) string {
            return fmt.Sprintf("$%.2f", m)
        },
    }

    // 注册模板函数
    tmpl = tmpl.Funcs(funcMap)

    // 执行模板函数生成内容
    var content string
    buf := &bytes.Buffer{}
    err := tmpl.Execute(buf, data)
    if err != nil {
        fmt.Println("Failed to execute template:", err)
        return content
    }

    content = buf.String()

    return content
}

In the above code, we first define a SalesData structure to represent sales data, which contains two fields: month and income. We then loaded a template file named template.docx and created a new Word document. Next, we iterate through the sales data and execute the newContent function to generate content. In the newContent function, we use a template function to format the time and amount. Finally, we add the generated content to the document and save it as a sales_report.docx file.

4. Summary
This article introduces how to use the template function in the Go language to dynamically generate Word documents, and provides relevant code examples. By using template functions, we can easily process and format data to achieve flexible document generation. I hope this article will help you in actual development.

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