[PATCH 3 of 3] hgweb: add diffs to the json changeset template

[Jordi Gutiérrez Hermoso]

# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh at octave.org>
# Date 1573851536 18000
#      Fri Nov 15 15:58:56 2019 -0500
# Node ID df8d762ab0683fb2fe337952b906e2944f89aaa2
# Parent  6a9122d3cd3639ddacb8768c573ea9eaeb9a6a33
hgweb: add diffs to the json changeset template

While it's possible to get the diff for each file individually via an
obscure url that I'm not even sure is documented, (e.g.
diff/{rev}/{filename}?style=json ), it is more convenient to provide
the full diff from the changeset view. This is already normally
computed for other non-JSON templates, so it seems like an oversight
to omit it for the JSON one.

The output format is a bit unwieldy but it's consistent with the
existing format output by the aforementioned obscure url.

diff --git a/mercurial/templates/json/map b/mercurial/templates/json/map
--- a/mercurial/templates/json/map
+++ b/mercurial/templates/json/map
@@ -66,6 +66,7 @@ changeset = '\{
   "user": {author|utf8|json},
   "parents": [{join(parent%changesetparent, ", ")}],
   "files": [{join(files, ", ")}],
+  "diff": [{join(diff, ", ")}],
   "phase": {phase|json}
   }'
 changesetbranch = '{name|utf8|json}'
diff --git a/tests/test-hgweb-json.t b/tests/test-hgweb-json.t
--- a/tests/test-hgweb-json.t
+++ b/tests/test-hgweb-json.t
@@ -782,6 +782,7 @@ changeset/ renders the tip changeset
       0
     ],
     "desc": "merge test-branch into default",
+    "diff": [],
     "files": [
       {
         "file": "foo-new",
@@ -813,6 +814,58 @@ changeset/{revision} shows tags
       0
     ],
     "desc": "move foo",
+    "diff": [
+      {
+        "blockno": 1,
+        "lines": [
+          {
+            "l": "--- a/foo\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 1,
+            "t": "-"
+          },
+          {
+            "l": "+++ /dev/null\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 2,
+            "t": "+"
+          },
+          {
+            "l": "@@ -1,1 +0,0 @@\n",
+            "n": 3,
+            "t": "@"
+          },
+          {
+            "l": "-bar\n",
+            "n": 4,
+            "t": "-"
+          }
+        ]
+      },
+      {
+        "blockno": 2,
+        "lines": [
+          {
+            "l": "--- /dev/null\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 1,
+            "t": "-"
+          },
+          {
+            "l": "+++ b/foo-new\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 2,
+            "t": "+"
+          },
+          {
+            "l": "@@ -0,0 +1,1 @@\n",
+            "n": 3,
+            "t": "@"
+          },
+          {
+            "l": "+bar\n",
+            "n": 4,
+            "t": "+"
+          }
+        ]
+      }
+    ],
     "files": [
       {
         "file": "foo",
@@ -849,6 +902,38 @@ changeset/{revision} shows bookmarks
       0
     ],
     "desc": "modify da/foo",
+    "diff": [
+      {
+        "blockno": 1,
+        "lines": [
+          {
+            "l": "--- a/da/foo\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 1,
+            "t": "-"
+          },
+          {
+            "l": "+++ b/da/foo\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 2,
+            "t": "+"
+          },
+          {
+            "l": "@@ -1,1 +1,1 @@\n",
+            "n": 3,
+            "t": "@"
+          },
+          {
+            "l": "-foo\n",
+            "n": 4,
+            "t": "-"
+          },
+          {
+            "l": "+bar\n",
+            "n": 5,
+            "t": "+"
+          }
+        ]
+      }
+    ],
     "files": [
       {
         "file": "da/foo",
@@ -877,6 +962,38 @@ changeset/{revision} shows branches
       0
     ],
     "desc": "create test branch",
+    "diff": [
+      {
+        "blockno": 1,
+        "lines": [
+          {
+            "l": "--- a/foo\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 1,
+            "t": "-"
+          },
+          {
+            "l": "+++ b/foo\tThu Jan 01 00:00:00 1970 +0000\n",
+            "n": 2,
+            "t": "+"
+          },
+          {
+            "l": "@@ -1,1 +1,1 @@\n",
+            "n": 3,
+            "t": "@"
+          },
+          {
+            "l": "-foo\n",
+            "n": 4,
+            "t": "-"
+          },
+          {
+            "l": "+branch\n",
+            "n": 5,
+            "t": "+"
+          }
+        ]
+      }
+    ],
     "files": [
       {
         "file": "foo",