Monorepo for Tangled
appview/repo: serve .diff and .patch for commits
Signed-off-by: Anirudh Oppiliappan <anirudh@tangled.org>
authored by
Anirudh Oppiliappan
and committed by
tangled.org
(Apr 6, 2026, 6:07 PM UTC)
23ee9ca5
c184a759
+450
+61
appview/repo/log.go
+61
appview/repo/log.go
···
3
3
import (
4
4
"encoding/json"
5
5
"fmt"
6
+
"io"
6
7
"net/http"
7
8
"net/url"
8
9
"strconv"
···
19
20
"github.com/go-chi/chi/v5"
20
21
"github.com/go-git/go-git/v5/plumbing"
21
22
)
23
+
24
+
func (rp *Repo) CommitRawDiff(w http.ResponseWriter, r *http.Request) {
25
+
rp.serveRawCommit(w, r, "diff")
26
+
}
27
+
28
+
func (rp *Repo) CommitRawPatch(w http.ResponseWriter, r *http.Request) {
29
+
rp.serveRawCommit(w, r, "patch")
30
+
}
31
+
32
+
func (rp *Repo) serveRawCommit(w http.ResponseWriter, r *http.Request, format string) {
33
+
l := rp.logger.With("handler", "CommitRaw", "format", format)
34
+
35
+
f, err := rp.repoResolver.Resolve(r)
36
+
if err != nil {
37
+
l.Error("failed to resolve repo", "err", err)
38
+
return
39
+
}
40
+
41
+
ref := chi.URLParam(r, "ref")
42
+
ref, _ = url.PathUnescape(ref)
43
+
44
+
if !plumbing.IsHash(ref) {
45
+
rp.pages.Error404(w)
46
+
return
47
+
}
48
+
49
+
scheme := "http"
50
+
if !rp.config.Core.Dev {
51
+
scheme = "https"
52
+
}
53
+
54
+
xrpcc := &indigoxrpc.Client{
55
+
Host: fmt.Sprintf("%s://%s", scheme, f.Knot),
56
+
}
57
+
58
+
xrpcBytes, err := tangled.RepoDiff(r.Context(), xrpcc, ref, f.RepoIdentifier())
59
+
if xrpcerr := xrpcclient.HandleXrpcErr(err); xrpcerr != nil {
60
+
l.Error("failed to call XRPC repo.diff", "err", xrpcerr)
61
+
rp.pages.Error503(w)
62
+
return
63
+
}
64
+
65
+
var result types.RepoCommitResponse
66
+
if err := json.Unmarshal(xrpcBytes, &result); err != nil {
67
+
l.Error("failed to decode XRPC response", "err", err)
68
+
rp.pages.Error503(w)
69
+
return
70
+
}
71
+
72
+
filename := ref[:7] + "." + format
73
+
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
74
+
w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", filename))
75
+
76
+
switch format {
77
+
case "patch":
78
+
io.WriteString(w, renderFormatPatch(result.Diff))
79
+
default:
80
+
io.WriteString(w, renderUnifiedDiff(result.Diff))
81
+
}
82
+
}
22
83
23
84
func (rp *Repo) Log(w http.ResponseWriter, r *http.Request) {
24
85
l := rp.logger.With("handler", "RepoLog")
+103
appview/repo/rawdiff.go
+103
appview/repo/rawdiff.go
···
1
+
package repo
2
+
3
+
import (
4
+
"fmt"
5
+
"strings"
6
+
"time"
7
+
8
+
"tangled.org/core/types"
9
+
)
10
+
11
+
// renderUnifiedDiff reconstructs a unified diff from a NiceDiff.
12
+
func renderUnifiedDiff(nd *types.NiceDiff) string {
13
+
if nd == nil {
14
+
return ""
15
+
}
16
+
var sb strings.Builder
17
+
for _, d := range nd.Diff {
18
+
oldName := d.Name.Old
19
+
newName := d.Name.New
20
+
if oldName == "" {
21
+
oldName = newName
22
+
}
23
+
if newName == "" {
24
+
newName = oldName
25
+
}
26
+
27
+
fmt.Fprintf(&sb, "diff --git a/%s b/%s\n", oldName, newName)
28
+
switch {
29
+
case d.IsNew:
30
+
fmt.Fprintf(&sb, "new file mode 100644\n")
31
+
fmt.Fprintf(&sb, "--- /dev/null\n")
32
+
fmt.Fprintf(&sb, "+++ b/%s\n", newName)
33
+
case d.IsDelete:
34
+
fmt.Fprintf(&sb, "deleted file mode 100644\n")
35
+
fmt.Fprintf(&sb, "--- a/%s\n", oldName)
36
+
fmt.Fprintf(&sb, "+++ /dev/null\n")
37
+
case d.IsRename:
38
+
fmt.Fprintf(&sb, "rename from %s\n", oldName)
39
+
fmt.Fprintf(&sb, "rename to %s\n", newName)
40
+
fmt.Fprintf(&sb, "--- a/%s\n", oldName)
41
+
fmt.Fprintf(&sb, "+++ b/%s\n", newName)
42
+
default:
43
+
fmt.Fprintf(&sb, "--- a/%s\n", oldName)
44
+
fmt.Fprintf(&sb, "+++ b/%s\n", newName)
45
+
}
46
+
47
+
for i := range d.TextFragments {
48
+
sb.WriteString(d.TextFragments[i].String())
49
+
}
50
+
}
51
+
return sb.String()
52
+
}
53
+
54
+
// renderFormatPatch reconstructs an email-style format-patch from a NiceDiff.
55
+
func renderFormatPatch(nd *types.NiceDiff) string {
56
+
if nd == nil {
57
+
return ""
58
+
}
59
+
c := nd.Commit
60
+
61
+
// subject: first line of commit message
62
+
subject := c.Message
63
+
if i := strings.IndexByte(subject, '\n'); i >= 0 {
64
+
subject = subject[:i]
65
+
}
66
+
67
+
// body: rest of message after first line
68
+
body := ""
69
+
if i := strings.Index(c.Message, "\n\n"); i >= 0 {
70
+
body = strings.TrimRight(c.Message[i+2:], "\n")
71
+
}
72
+
73
+
date := c.Author.When.UTC().Format(time.RFC1123Z)
74
+
75
+
var sb strings.Builder
76
+
fmt.Fprintf(&sb, "From %s Mon Sep 17 00:00:00 2001\n", c.Hash.String())
77
+
fmt.Fprintf(&sb, "From: %s <%s>\n", c.Author.Name, c.Author.Email)
78
+
fmt.Fprintf(&sb, "Date: %s\n", date)
79
+
fmt.Fprintf(&sb, "Subject: [PATCH] %s\n", subject)
80
+
sb.WriteString("\n")
81
+
if body != "" {
82
+
sb.WriteString(body)
83
+
sb.WriteString("\n")
84
+
}
85
+
sb.WriteString("---\n")
86
+
87
+
// stat summary
88
+
for _, d := range nd.Diff {
89
+
name := d.Name.New
90
+
if name == "" {
91
+
name = d.Name.Old
92
+
}
93
+
stats := d.Stats()
94
+
fmt.Fprintf(&sb, " %s | %d %s\n", name, stats.Insertions+stats.Deletions,
95
+
strings.Repeat("+", int(stats.Insertions))+strings.Repeat("-", int(stats.Deletions)))
96
+
}
97
+
fmt.Fprintf(&sb, " %d file(s) changed, %d insertion(s)(+), %d deletion(s)(-)\n\n",
98
+
nd.Stat.FilesChanged, nd.Stat.Insertions, nd.Stat.Deletions)
99
+
100
+
sb.WriteString(renderUnifiedDiff(nd))
101
+
sb.WriteString("\n--\ntangled.sh\n")
102
+
return sb.String()
103
+
}
+284
appview/repo/rawdiff_test.go
+284
appview/repo/rawdiff_test.go
···
1
+
package repo
2
+
3
+
import (
4
+
"strings"
5
+
"testing"
6
+
"time"
7
+
8
+
"github.com/bluekeyes/go-gitdiff/gitdiff"
9
+
"github.com/go-git/go-git/v5/plumbing"
10
+
"github.com/go-git/go-git/v5/plumbing/object"
11
+
"tangled.org/core/types"
12
+
)
13
+
14
+
// parseDiff is a test helper that parses a unified diff string into gitdiff.TextFragment slices.
15
+
func parseDiff(t *testing.T, src string) []*gitdiff.File {
16
+
t.Helper()
17
+
files, _, err := gitdiff.Parse(strings.NewReader(src))
18
+
if err != nil {
19
+
t.Fatalf("gitdiff.Parse: %v", err)
20
+
}
21
+
return files
22
+
}
23
+
24
+
// niceDiffFromParsed builds a NiceDiff from parsed gitdiff.File entries, mirroring
25
+
// what the knotserver does in git.Diff().
26
+
func niceDiffFromParsed(files []*gitdiff.File, commit types.Commit, stat types.DiffStat) *types.NiceDiff {
27
+
nd := &types.NiceDiff{Commit: commit, Stat: stat}
28
+
for _, f := range files {
29
+
d := types.Diff{
30
+
IsBinary: f.IsBinary,
31
+
IsNew: f.IsNew,
32
+
IsDelete: f.IsDelete,
33
+
IsCopy: f.IsCopy,
34
+
IsRename: f.IsRename,
35
+
}
36
+
d.Name.Old = f.OldName
37
+
d.Name.New = f.NewName
38
+
for _, tf := range f.TextFragments {
39
+
d.TextFragments = append(d.TextFragments, *tf)
40
+
}
41
+
nd.Diff = append(nd.Diff, d)
42
+
}
43
+
return nd
44
+
}
45
+
46
+
func TestRenderUnifiedDiff_nil(t *testing.T) {
47
+
if got := renderUnifiedDiff(nil); got != "" {
48
+
t.Errorf("expected empty string for nil NiceDiff, got %q", got)
49
+
}
50
+
}
51
+
52
+
func TestRenderUnifiedDiff_modified(t *testing.T) {
53
+
const src = `diff --git a/foo.go b/foo.go
54
+
--- a/foo.go
55
+
+++ b/foo.go
56
+
@@ -1,3 +1,3 @@
57
+
package main
58
+
-// old comment
59
+
+// new comment
60
+
func main() {}
61
+
`
62
+
files := parseDiff(t, src)
63
+
nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{})
64
+
got := renderUnifiedDiff(nd)
65
+
66
+
checks := []string{
67
+
"diff --git a/foo.go b/foo.go\n",
68
+
"--- a/foo.go\n",
69
+
"+++ b/foo.go\n",
70
+
"@@ -1,3 +1,3 @@",
71
+
"-// old comment\n",
72
+
"+// new comment\n",
73
+
}
74
+
for _, want := range checks {
75
+
if !strings.Contains(got, want) {
76
+
t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got)
77
+
}
78
+
}
79
+
}
80
+
81
+
func TestRenderUnifiedDiff_newFile(t *testing.T) {
82
+
const src = `diff --git a/new.go b/new.go
83
+
new file mode 100644
84
+
--- /dev/null
85
+
+++ b/new.go
86
+
@@ -0,0 +1,2 @@
87
+
+package main
88
+
+func main() {}
89
+
`
90
+
files := parseDiff(t, src)
91
+
nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{})
92
+
got := renderUnifiedDiff(nd)
93
+
94
+
checks := []string{
95
+
"diff --git a/new.go b/new.go\n",
96
+
"new file mode 100644\n",
97
+
"--- /dev/null\n",
98
+
"+++ b/new.go\n",
99
+
"+package main\n",
100
+
}
101
+
for _, want := range checks {
102
+
if !strings.Contains(got, want) {
103
+
t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got)
104
+
}
105
+
}
106
+
}
107
+
108
+
func TestRenderUnifiedDiff_deletedFile(t *testing.T) {
109
+
const src = `diff --git a/old.go b/old.go
110
+
deleted file mode 100644
111
+
--- a/old.go
112
+
+++ /dev/null
113
+
@@ -1,2 +0,0 @@
114
+
-package main
115
+
-func main() {}
116
+
`
117
+
files := parseDiff(t, src)
118
+
nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{})
119
+
got := renderUnifiedDiff(nd)
120
+
121
+
checks := []string{
122
+
"diff --git a/old.go b/old.go\n",
123
+
"deleted file mode 100644\n",
124
+
"--- a/old.go\n",
125
+
"+++ /dev/null\n",
126
+
"-package main\n",
127
+
}
128
+
for _, want := range checks {
129
+
if !strings.Contains(got, want) {
130
+
t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got)
131
+
}
132
+
}
133
+
}
134
+
135
+
func TestRenderUnifiedDiff_renamedFile(t *testing.T) {
136
+
const src = `diff --git a/old.go b/renamed.go
137
+
rename from old.go
138
+
rename to renamed.go
139
+
--- a/old.go
140
+
+++ b/renamed.go
141
+
@@ -1,2 +1,2 @@
142
+
package main
143
+
-func old() {}
144
+
+func renamed() {}
145
+
`
146
+
files := parseDiff(t, src)
147
+
nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{})
148
+
got := renderUnifiedDiff(nd)
149
+
150
+
checks := []string{
151
+
"diff --git a/old.go b/renamed.go\n",
152
+
"rename from old.go\n",
153
+
"rename to renamed.go\n",
154
+
"--- a/old.go\n",
155
+
"+++ b/renamed.go\n",
156
+
}
157
+
for _, want := range checks {
158
+
if !strings.Contains(got, want) {
159
+
t.Errorf("renderUnifiedDiff output missing %q\ngot:\n%s", want, got)
160
+
}
161
+
}
162
+
}
163
+
164
+
func TestRenderUnifiedDiff_multipleFiles(t *testing.T) {
165
+
const src = `diff --git a/a.go b/a.go
166
+
--- a/a.go
167
+
+++ b/a.go
168
+
@@ -1,1 +1,1 @@
169
+
-old a
170
+
+new a
171
+
diff --git a/b.go b/b.go
172
+
--- a/b.go
173
+
+++ b/b.go
174
+
@@ -1,1 +1,1 @@
175
+
-old b
176
+
+new b
177
+
`
178
+
files := parseDiff(t, src)
179
+
nd := niceDiffFromParsed(files, types.Commit{}, types.DiffStat{})
180
+
got := renderUnifiedDiff(nd)
181
+
182
+
for _, want := range []string{"diff --git a/a.go b/a.go", "diff --git a/b.go b/b.go"} {
183
+
if !strings.Contains(got, want) {
184
+
t.Errorf("missing %q in output:\n%s", want, got)
185
+
}
186
+
}
187
+
}
188
+
189
+
func TestRenderFormatPatch_nil(t *testing.T) {
190
+
if got := renderFormatPatch(nil); got != "" {
191
+
t.Errorf("expected empty string for nil NiceDiff, got %q", got)
192
+
}
193
+
}
194
+
195
+
func TestRenderFormatPatch_headers(t *testing.T) {
196
+
when := time.Date(2024, 3, 15, 10, 30, 0, 0, time.UTC)
197
+
hash := plumbing.NewHash("abc1234567890000000000000000000000000000")
198
+
199
+
nd := &types.NiceDiff{
200
+
Commit: types.Commit{
201
+
Hash: hash,
202
+
Message: "Fix the bug\n\nThis patch resolves the long-standing issue.\n",
203
+
Author: object.Signature{
204
+
Name: "Alice Dev",
205
+
Email: "alice@example.com",
206
+
When: when,
207
+
},
208
+
},
209
+
Stat: types.DiffStat{FilesChanged: 1, Insertions: 2, Deletions: 1},
210
+
}
211
+
212
+
got := renderFormatPatch(nd)
213
+
214
+
checks := []string{
215
+
"From abc1234567890000000000000000000000000000 Mon Sep 17 00:00:00 2001\n",
216
+
"From: Alice Dev <alice@example.com>\n",
217
+
"Date: Fri, 15 Mar 2024 10:30:00 +0000\n",
218
+
"Subject: [PATCH] Fix the bug\n",
219
+
"This patch resolves the long-standing issue.\n",
220
+
"---\n",
221
+
" 1 file(s) changed, 2 insertion(s)(+), 1 deletion(s)(-)\n",
222
+
"\n--\ntangled.sh\n",
223
+
}
224
+
for _, want := range checks {
225
+
if !strings.Contains(got, want) {
226
+
t.Errorf("renderFormatPatch output missing %q\ngot:\n%s", want, got)
227
+
}
228
+
}
229
+
}
230
+
231
+
func TestRenderFormatPatch_subjectOnly(t *testing.T) {
232
+
// Single-line message (no body) should not emit a blank body section.
233
+
nd := &types.NiceDiff{
234
+
Commit: types.Commit{
235
+
Message: "Single line commit",
236
+
Author: object.Signature{When: time.Now()},
237
+
},
238
+
}
239
+
got := renderFormatPatch(nd)
240
+
241
+
if !strings.Contains(got, "Subject: [PATCH] Single line commit\n") {
242
+
t.Errorf("missing subject in output:\n%s", got)
243
+
}
244
+
// Body should not appear between Subject and "---"
245
+
parts := strings.SplitN(got, "---\n", 2)
246
+
if len(parts) < 2 {
247
+
t.Fatalf("expected '---' separator in output:\n%s", got)
248
+
}
249
+
beforeSep := parts[0]
250
+
// Only the blank line between headers and body should be there, no extra content.
251
+
afterSubject := strings.SplitN(beforeSep, "Subject: [PATCH] Single line commit\n", 2)
252
+
if len(afterSubject) == 2 && strings.TrimSpace(afterSubject[1]) != "" {
253
+
t.Errorf("unexpected body content before '---': %q", afterSubject[1])
254
+
}
255
+
}
256
+
257
+
func TestRenderFormatPatch_containsDiff(t *testing.T) {
258
+
const src = `diff --git a/foo.go b/foo.go
259
+
--- a/foo.go
260
+
+++ b/foo.go
261
+
@@ -1,2 +1,2 @@
262
+
package main
263
+
-// old
264
+
+// new
265
+
`
266
+
files := parseDiff(t, src)
267
+
nd := niceDiffFromParsed(files, types.Commit{
268
+
Author: object.Signature{When: time.Now()},
269
+
}, types.DiffStat{FilesChanged: 1, Insertions: 1, Deletions: 1})
270
+
271
+
got := renderFormatPatch(nd)
272
+
273
+
checks := []string{
274
+
"diff --git a/foo.go b/foo.go\n",
275
+
"-// old\n",
276
+
"+// new\n",
277
+
" foo.go |",
278
+
}
279
+
for _, want := range checks {
280
+
if !strings.Contains(got, want) {
281
+
t.Errorf("renderFormatPatch output missing %q\ngot:\n%s", want, got)
282
+
}
283
+
}
284
+
}
+2
appview/repo/router.go
+2
appview/repo/router.go