From 51f11a9897e48d48b84edec0b15f0940d3597dbe Mon Sep 17 00:00:00 2001
From: jolheiser <git@jolheiser.com>
Date: Wed, 4 Jun 2025 10:51:03 -0500
Subject: [PATCH] permalink

---
 internal/git/git.go        | 15 +++++++++++++++
 internal/html/repo_file.go |  7 ++++++-
 internal/html/repo_file.js | 13 +++++++++++++
 internal/http/repo.go      | 10 ++++++++++
 4 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/internal/git/git.go b/internal/git/git.go
index 72140d8..fcdb9e3 100644
--- a/internal/git/git.go
+++ b/internal/git/git.go
@@ -127,6 +127,21 @@ func (r Repo) Dir(ref, path string) ([]FileInfo, error) {
 	return fis, nil
 }
 
+// GetCommitFromRef returns the commit object for a given ref
+func (r Repo) GetCommitFromRef(ref string) (*object.Commit, error) {
+	g, err := r.Git()
+	if err != nil {
+		return nil, err
+	}
+
+	hash, err := g.ResolveRevision(plumbing.Revision(ref))
+	if err != nil {
+		return nil, err
+	}
+
+	return g.CommitObject(*hash)
+}
+
 // FileContent returns the content of a file in the git tree at a given ref/rev
 func (r Repo) FileContent(ref, file string) (string, error) {
 	t, err := r.Tree(ref)
diff --git a/internal/html/repo_file.go b/internal/html/repo_file.go
index 6dd3cb1..45f78a5 100644
--- a/internal/html/repo_file.go
+++ b/internal/html/repo_file.go
@@ -2,6 +2,7 @@ package html
 
 import (
 	_ "embed"
+	"fmt"
 
 	. "maragu.dev/gomponents"
 	. "maragu.dev/gomponents/html"
@@ -11,7 +12,9 @@ type RepoFileContext struct {
 	BaseContext
 	RepoHeaderComponentContext
 	RepoBreadcrumbComponentContext
-	Code string
+	Code   string
+	Commit string
+	Path   string
 }
 
 //go:embed repo_file.js
@@ -24,6 +27,8 @@ func RepoFileTemplate(rfc RepoFileContext) Node {
 			repoBreadcrumbComponent(rfc.RepoBreadcrumbComponentContext),
 			Text(" - "),
 			A(Class("text-text underline decoration-text/50 decoration-dashed hover:decoration-solid"), Href("?raw"), Text("raw")),
+			Text(" - "),
+			A(Class("text-text underline decoration-text/50 decoration-dashed hover:decoration-solid"), ID("permalink"), Href(fmt.Sprintf("/%s/tree/%s/%s", rfc.RepoBreadcrumbComponentContext.Repo, rfc.Commit, rfc.Path)), Text("permalink")),
 			Div(Class("code relative"),
 				Raw(rfc.Code),
 				Button(ID("copy"), Class("absolute top-0 right-0 rounded bg-base hover:bg-surface0")),
diff --git a/internal/html/repo_file.js b/internal/html/repo_file.js
index 42d5a24..ebc4ad8 100644
--- a/internal/html/repo_file.js
+++ b/internal/html/repo_file.js
@@ -2,6 +2,7 @@ const lineRe = /#L(\d+)(?:-L(\d+))?/g
 const $lineLines = document.querySelectorAll(".chroma .lntable .lnt");
 const $codeLines = document.querySelectorAll(".chroma .lntable .line");
 const $copyButton = document.getElementById('copy');
+const $permalinkButton = document.getElementById('permalink');
 const $copyIcon = "📋";
 const $copiedIcon = "✅";
 let $code = ""
@@ -48,6 +49,18 @@ $copyButton.addEventListener("click", () => {
     }, 1000);
 });
 
+$permalinkButton.addEventListener("click", (event) => {
+    event.preventDefault();
+    const url = $permalinkButton.getAttribute("href");
+    navigator.clipboard.writeText(window.location.origin + url + location.hash);
+    
+    const originalText = $permalinkButton.innerText;
+    $permalinkButton.innerText = "copied!";
+    setTimeout(() => {
+        $permalinkButton.innerText = originalText;
+    }, 1000);
+});
+
 function activateLines(start, end) {
     if (end < start) end = start;
     for (let idx = start - 1; idx < end; idx++) {
diff --git a/internal/http/repo.go b/internal/http/repo.go
index 5382b7d..c47811a 100644
--- a/internal/http/repo.go
+++ b/internal/http/repo.go
@@ -92,11 +92,21 @@ func (rh repoHandler) repoFile(w http.ResponseWriter, r *http.Request, repo *git
 		return httperr.Error(err)
 	}
 
+	commit := ref
+	if len(ref) < 40 {
+		commitObj, err := repo.GetCommitFromRef(ref)
+		if err == nil {
+			commit = commitObj.Hash.String()
+		}
+	}
+
 	if err := html.RepoFileTemplate(html.RepoFileContext{
 		BaseContext:                    rh.baseContext(),
 		RepoHeaderComponentContext:     rh.repoHeaderContext(repo, r),
 		RepoBreadcrumbComponentContext: rh.repoBreadcrumbContext(repo, r, path),
 		Code:                           buf.String(),
+		Commit:                         commit,
+		Path:                           path,
 	}).Render(w); err != nil {
 		return httperr.Error(err)
 	}