0a9b177f7c
Bootstrapped during the 2026-06-06 BlockNinja consolidation. Was previously an unversioned directory inside ~/src/blockninja-themes/terminal. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
142 lines
6.1 KiB
Plaintext
142 lines
6.1 KiB
Plaintext
package main
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import (
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"bytes"
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"context"
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"fmt"
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"strings"
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"git.dev.alexdunmow.com/block/core/templates"
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)
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const terminalEmailRule = "================================================================================"
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const terminalSigDelim = "-- \n"
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// TerminalEmailWrapper produces a plain-text-first, monospace, 80-col centred
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// email body. The first part is the plain text fallback; the HTML version
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// follows it as a comment-delimited block. Inline styles only — no <style>
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// tags, no external stylesheets.
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//
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// Many CMS pipelines accept a single string body and MIME-multipart it
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// themselves; we emit the plain text up front via an HTML comment block so
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// the assembled message contains both representations in a deterministic
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// order regardless of the host's MIME assembly.
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func TerminalEmailWrapper(body string, emailCtx templates.EmailContext) string {
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plain := buildTerminalPlainText(body, emailCtx)
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var buf bytes.Buffer
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terminalEmailHTML(emailCtx, body, plain).Render(context.Background(), &buf)
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return buf.String()
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}
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// buildTerminalPlainText assembles the text/plain payload: ASCII rule above
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// and below, the body, then a `-- \n` signature delimiter, then site info
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// and unsubscribe URL.
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//
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// The body is passed through as-is. Senders that want pristine plain text
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// should compose the text version themselves; we do not attempt to strip
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// HTML markup here.
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func buildTerminalPlainText(body string, emailCtx templates.EmailContext) string {
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var b strings.Builder
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b.WriteString(terminalEmailRule + "\n")
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b.WriteString(strings.TrimSpace(body) + "\n")
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b.WriteString(terminalEmailRule + "\n")
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b.WriteString(terminalSigDelim)
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if emailCtx.SiteSettings.SiteName != "" {
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b.WriteString(emailCtx.SiteSettings.SiteName + "\n")
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}
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if emailCtx.SiteSettings.SiteURL != "" {
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b.WriteString(emailCtx.SiteSettings.SiteURL + "\n")
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}
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if emailCtx.UnsubscribeURL != "" {
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b.WriteString("unsubscribe: " + emailCtx.UnsubscribeURL + "\n")
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}
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return b.String()
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}
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func terminalEmailBgColor(c templates.EmailContext) string {
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if c.Colors.Background != "" {
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return c.Colors.Background
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}
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return "#0a0a0a"
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}
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func terminalEmailFgColor(c templates.EmailContext) string {
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if c.Colors.Foreground != "" {
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return c.Colors.Foreground
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}
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return "#00ff00"
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}
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func terminalEmailBorderColor(c templates.EmailContext) string {
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if c.Colors.Border != "" {
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return c.Colors.Border
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}
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return "#1a4a1a"
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}
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func terminalEmailMutedFgColor(c templates.EmailContext) string {
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if c.Colors.MutedForeground != "" {
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return c.Colors.MutedForeground
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}
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return "#5a8c5a"
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}
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// terminalEmailHTML emits an HTML document with inline styles only. The
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// plain text representation is included in an HTML comment so callers and
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// hand-inspection both see both parts.
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templ terminalEmailHTML(emailCtx templates.EmailContext, body, plain string) {
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<!DOCTYPE html>
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@templ.Raw(fmt.Sprintf("<!-- text/plain alternative\n%s\n-->\n", plain))
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<html lang="en">
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<head>
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<meta charset="utf-8"/>
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<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
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<title>{ emailCtx.SiteSettings.SiteName }</title>
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</head>
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<body style={ fmt.Sprintf("background-color: %s; margin: 0; padding: 0; font-family: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;", terminalEmailBgColor(emailCtx)) }>
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if emailCtx.PreviewText != "" {
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<div style="display:none; max-height:0; overflow:hidden;">{ emailCtx.PreviewText }</div>
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}
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<table role="presentation" width="100%" cellspacing="0" cellpadding="0" border="0" style={ fmt.Sprintf("background-color: %s;", terminalEmailBgColor(emailCtx)) }>
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<tr>
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<td align="center" style={ fmt.Sprintf("padding: 32px 12px; font-family: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: %s;", terminalEmailFgColor(emailCtx)) }>
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<table role="presentation" width="640" cellspacing="0" cellpadding="0" border="0" style={ fmt.Sprintf("max-width: 640px; width: 100%%; border: 1px solid %s; background-color: %s;", terminalEmailBorderColor(emailCtx), terminalEmailBgColor(emailCtx)) }>
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<tr>
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<td style={ fmt.Sprintf("padding: 16px 24px 0; font-family: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: %s; letter-spacing: 0.05em;", terminalEmailFgColor(emailCtx)) }>
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{ terminalEmailRule }
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</td>
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</tr>
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<tr>
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<td style={ fmt.Sprintf("padding: 16px 24px; font-family: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: %s; font-size: 14px; line-height: 1.6;", terminalEmailFgColor(emailCtx)) }>
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@templ.Raw(body)
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</td>
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</tr>
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<tr>
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<td style={ fmt.Sprintf("padding: 0 24px; font-family: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: %s; letter-spacing: 0.05em;", terminalEmailFgColor(emailCtx)) }>
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{ terminalEmailRule }
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</td>
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</tr>
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<tr>
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<td style={ fmt.Sprintf("padding: 16px 24px; font-family: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: %s; font-size: 12px;", terminalEmailMutedFgColor(emailCtx)) }>
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<pre style={ fmt.Sprintf("margin: 0; font-family: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: %s; white-space: pre-wrap;", terminalEmailMutedFgColor(emailCtx)) }>{ terminalSigDelim }</pre>
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if emailCtx.SiteSettings.SiteName != "" {
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<div>{ emailCtx.SiteSettings.SiteName }</div>
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}
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if emailCtx.SiteSettings.SiteURL != "" {
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<div><a href={ templ.SafeURL(emailCtx.SiteSettings.SiteURL) } style={ fmt.Sprintf("color: %s; text-decoration: underline;", terminalEmailFgColor(emailCtx)) }>{ emailCtx.SiteSettings.SiteURL }</a></div>
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}
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if emailCtx.UnsubscribeURL != "" {
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<div><a href={ templ.SafeURL(emailCtx.UnsubscribeURL) } style={ fmt.Sprintf("color: %s; text-decoration: underline;", terminalEmailMutedFgColor(emailCtx)) }>unsubscribe</a></div>
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}
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</td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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</body>
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</html>
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}
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