Merge pull request #5 from ahmadfaizk/feat/support-table

Add dynamic components

Author: akfaiz

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*.md]
+trim_trailing_whitespace = false
+max_line_length = 80
+
+[*.txt]
+trim_trailing_whitespace = false
+max_line_length = 80
+
+[*.{html,css}]
+indent_size = 2
+tab_width = 2
+max_line_length = 120

Makefile

@@ -44,4 +44,9 @@ coverage-check:
 		exit 1; \
 	else \
 		echo "Coverage is sufficient: $$COVERAGE%"; \
-	fi
+	fi
+
+.PHONY: update-examples
+update-examples:
+	@echo "Updating example files..."
+	go run ./examples/main.go

component.go

@@ -0,0 +1,141 @@
+package mailer
+
+import (
+	"bytes"
+	"fmt"
+	htmltemplate "html/template"
+	"strings"
+)
+
+type Component interface {
+	HTML(tmpl *htmltemplate.Template) (string, error)
+	PlainText() string
+}
+
+var _ Component = &Action{}
+var _ Component = &Line{}
+var _ Component = &Table{}
+
+// Action represents an action button in the email message.
+type Action struct {
+	Text  string
+	URL   string
+	Color string
+}
+
+type Line struct {
+	Text string
+}
+
+// Table represents a simple table structure for the email message.
+type Table struct {
+	Headers []TableHeader
+	Rows    [][]string
+}
+
+// TableHeader represents a header in the table.
+type TableHeader struct {
+	Text  string
+	Width string
+	Align string
+}
+
+func (a Action) HTML(tmpl *htmltemplate.Template) (string, error) {
+	var buf bytes.Buffer
+	err := tmpl.ExecuteTemplate(&buf, "button", a)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+func (a Action) PlainText() string {
+	return fmt.Sprintf("%s ( %s )", a.Text, a.URL)
+}
+
+func (l Line) HTML(tmpl *htmltemplate.Template) (string, error) {
+	var buf bytes.Buffer
+	err := tmpl.ExecuteTemplate(&buf, "line", l)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+func (l Line) PlainText() string {
+	return l.Text
+}
+
+func (t Table) HTML(tmpl *htmltemplate.Template) (string, error) {
+	var buf bytes.Buffer
+	err := tmpl.ExecuteTemplate(&buf, "table", t)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+func (t Table) PlainText() string {
+	var sb strings.Builder
+
+	// Add optional instruction
+
+	// Determine column widths
+	colWidths := make([]int, len(t.Headers))
+	for i, header := range t.Headers {
+		colWidths[i] = len(header.Text)
+	}
+	for _, row := range t.Rows {
+		for i, cell := range row {
+			if len(cell) > colWidths[i] {
+				colWidths[i] = len(cell)
+			}
+		}
+	}
+
+	// Write headers
+	for i, header := range t.Headers {
+		sb.WriteString(t.padCell(header.Text, colWidths[i], header.Align))
+		if i < len(t.Headers)-1 {
+			sb.WriteString(" | ")
+		}
+	}
+	sb.WriteString("\n")
+
+	// Write separator line
+	for i, width := range colWidths {
+		sb.WriteString(strings.Repeat("-", width))
+		if i < len(colWidths)-1 {
+			sb.WriteString("-+-")
+		}
+	}
+	sb.WriteString("\n")
+
+	// Write rows
+	for _, row := range t.Rows {
+		for i, cell := range row {
+			align := t.Headers[i].Align
+			sb.WriteString(t.padCell(cell, colWidths[i], align))
+			if i < len(row)-1 {
+				sb.WriteString(" | ")
+			}
+		}
+		sb.WriteString("\n")
+	}
+
+	return sb.String()
+}
+
+func (t Table) padCell(text string, width int, align string) string {
+	switch strings.ToLower(align) {
+	case "right":
+		return fmt.Sprintf("%*s", width, text)
+	case "center":
+		padding := width - len(text)
+		left := padding / 2
+		right := padding - left
+		return strings.Repeat(" ", left) + text + strings.Repeat(" ", right)
+	default: // left
+		return fmt.Sprintf("%-*s", width, text)
+	}
+}

config.go

@@ -1,5 +1,21 @@
 package mailer
 
+import "fmt"
+
+// Address represents an email address with an optional name.
+type Address struct {
+	Name    string
+	Address string
+}
+
+// String returns a string representation of the email message.
+func (a Address) String() string {
+	if a.Name == "" {
+		return a.Address
+	}
+	return fmt.Sprintf("%s <%s>", a.Name, a.Address)
+}
+
 type config struct {
 	theme   string
 	from    Address