json: implement {filediff} template

Single letter properties are used to keep payload size down, as diff
representation can be quite large and longer property names can create a
lot of extra work for parsers.

Rename is not yet captured. This can be done in a follow-up.

mercurial/templates/json/map

@@ -1,100 +1,133
 mimetype = 'application/json'
 filerevision = '"not yet implemented"'
 search = '"not yet implemented"'
 # changelog and shortlog are the same web API but with different
 # number of entries.
 changelog = changelist.tmpl
 shortlog = changelist.tmpl
 changelistentry = '\{
   "node": {node|json},
   "date": {date|json},
   "desc": {desc|json},
   "bookmarks": [{join(bookmarks%changelistentryname, ", ")}],
   "tags": [{join(tags%changelistentryname, ", ")}],
   "user": {author|json}
   }'
 changelistentryname = '{name|json}'
 changeset = '\{
   "node": {node|json},
   "date": {date|json},
   "desc": {desc|json},
   "branch": {if(branch, branch%changesetbranch, "default"|json)},
   "bookmarks": [{join(changesetbookmark, ", ")}],
   "tags": [{join(changesettag, ", ")}],
   "user": {author|json},
   "parents": [{join(parent%changesetparent, ", ")}],
   "phase": {phase|json}
   }'
 changesetbranch = '{name|json}'
 changesetbookmark = '{bookmark|json}'
 changesettag = '{tag|json}'
 changesetparent = '{node|json}'
 manifest = '\{
   "node": {node|json},
   "abspath": {path|json},
   "directories": [{join(dentries%direntry, ", ")}],
   "files": [{join(fentries%fileentry, ", ")}],
   "bookmarks": [{join(bookmarks%name, ", ")}],
   "tags": [{join(tags%name, ", ")}]
   }'
 name = '{name|json}'
 direntry = '\{
   "abspath": {path|json},
   "basename": {basename|json},
   "emptydirs": {emptydirs|json}
   }'
 fileentry = '\{
   "abspath": {file|json},
   "basename": {basename|json},
   "date": {date|json},
   "size": {size|json},
   "flags": {permissions|json}
   }'
 tags = '\{
   "node": {node|json},
   "tags": [{join(entriesnotip%tagentry, ", ")}]
   }'
 tagentry = '\{
   "tag": {tag|json},
   "node": {node|json},
   "date": {date|json}
   }'
 bookmarks = '\{
   "node": {node|json},
   "bookmarks": [{join(entries%bookmarkentry, ", ")}]
   }'
 bookmarkentry = '\{
   "bookmark": {bookmark|json},
   "node": {node|json},
   "date": {date|json}
   }'
 branches = '\{
   "branches": [{join(entries%branchentry, ", ")}]
   }'
 branchentry = '\{
   "branch": {branch|json},
   "node": {node|json},
   "date": {date|json},
   "status": {status|json}
   }'
 summary = '"not yet implemented"'
-filediff = '"not yet implemented"'
+filediff = '\{
+  "path": {file|json},
+  "node": {node|json},
+  "date": {date|json},
+  "desc": {desc|json},
+  "author": {author|json},
+  "parents": [{join(parent%changesetparent, ", ")}],
+  "children": [{join(child%changesetparent, ", ")}],
+  "diff": [{join(diff%diffblock, ", ")}]
+  }'
+diffblock = '\{
+  "blockno": {blockno|json},
+  "lines": [{join(lines, ", ")}]
+  }'
+difflineplus = '\{
+  "t": "+",
+  "n": {lineno|json},
+  "l": {line|json}
+  }'
+difflineminus = '\{
+  "t": "-",
+  "n": {lineno|json},
+  "l": {line|json}
+  }'
+difflineat = '\{
+  "t": "@",
+  "n": {lineno|json},
+  "l": {line|json}
+  }'
+diffline = '\{
+  "t": "",
+  "n": {lineno|json},
+  "l": {line|json}
+  }'
 filecomparison = '"not yet implemented"'
 fileannotate = '"not yet implemented"'
 filelog = '"not yet implemented"'
 graph = '"not yet implemented"'
 helptopics = '\{
   "topics": [{join(topics%helptopicentry, ", ")}],
   "earlycommands": [{join(earlycommands%helptopicentry, ", ")}],
   "othercommands": [{join(othercommands%helptopicentry, ", ")}]
   }'
 helptopicentry = '\{
   "topic": {topic|json},
   "summary": {summary|json}
   }'
 help = '\{
   "topic": {topic|json},
   "rawdoc": {doc|json}
   }'
 filenodelink = ''
 filenolink = ''

tests/test-hgweb-json.t

@@ -1,1009 +1,1054
 #require json
 #require serve
 
   $ request() {
   >   $TESTDIR/get-with-headers.py --json localhost:$HGPORT "$1"
   > }
 
   $ hg init test
   $ cd test
   $ mkdir da
   $ echo foo > da/foo
   $ echo foo > foo
   $ hg -q ci -A -m initial
   $ echo bar > foo
   $ hg ci -m 'modify foo'
   $ echo bar > da/foo
   $ hg ci -m 'modify da/foo'
   $ hg bookmark bookmark1
   $ hg up default
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (leaving bookmark bookmark1)
   $ hg mv foo foo-new
   $ hg commit -m 'move foo'
   $ hg tag -m 'create tag' tag1
   $ hg phase --public -r .
   $ echo baz > da/foo
   $ hg commit -m 'another commit to da/foo'
   $ hg tag -m 'create tag2' tag2
   $ hg bookmark bookmark2
   $ hg -q up -r 0
   $ hg -q branch test-branch
   $ echo branch > foo
   $ hg commit -m 'create test branch'
   $ echo branch_commit_2 > foo
   $ hg commit -m 'another commit in test-branch'
   $ hg -q up default
   $ hg merge --tool :local test-branch
   0 files updated, 1 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ hg commit -m 'merge test-branch into default'
 
   $ hg log -G
   @    changeset:   9:cc725e08502a
   |\   tag:         tip
   | |  parent:      6:ceed296fe500
   | |  parent:      8:ed66c30e87eb
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     merge test-branch into default
   | |
   | o  changeset:   8:ed66c30e87eb
   | |  branch:      test-branch
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     another commit in test-branch
   | |
   | o  changeset:   7:6ab967a8ab34
   | |  branch:      test-branch
   | |  parent:      0:06e557f3edf6
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     create test branch
   | |
   o |  changeset:   6:ceed296fe500
   | |  bookmark:    bookmark2
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     create tag2
   | |
   o |  changeset:   5:f2890a05fea4
   | |  tag:         tag2
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     another commit to da/foo
   | |
   o |  changeset:   4:93a8ce14f891
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     create tag
   | |
   o |  changeset:   3:78896eb0e102
   | |  tag:         tag1
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     move foo
   | |
   o |  changeset:   2:8d7c456572ac
   | |  bookmark:    bookmark1
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     modify da/foo
   | |
   o |  changeset:   1:f8bbb9024b10
   |/   user:        test
   |    date:        Thu Jan 01 00:00:00 1970 +0000
   |    summary:     modify foo
   |
   o  changeset:   0:06e557f3edf6
      user:        test
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     initial
   
 
   $ hg serve -p $HGPORT -d --pid-file=hg.pid -A access.log -E error.log
   $ cat hg.pid >> $DAEMON_PIDS
 
 (Try to keep these in roughly the order they are defined in webcommands.py)
 
 (log is handled by filelog/ and changelog/ - ignore it)
 
 (rawfile/ doesn't use templating - nothing to test)
 
 file/{revision}/{path} shows file revision
 
   $ request json-file/06e557f3edf6/foo
   200 Script output follows
   
   "not yet implemented"
 
 file/{revision} shows root directory info
 
   $ request json-file/cc725e08502a
   200 Script output follows
   
   {
     "abspath": "/",
     "bookmarks": [],
     "directories": [
       {
         "abspath": "/da",
         "basename": "da",
         "emptydirs": ""
       }
     ],
     "files": [
       {
         "abspath": ".hgtags",
         "basename": ".hgtags",
         "date": [
           0.0,
           0
         ],
         "flags": "",
         "size": 92
       },
       {
         "abspath": "foo-new",
         "basename": "foo-new",
         "date": [
           0.0,
           0
         ],
         "flags": "",
         "size": 4
       }
     ],
     "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
     "tags": [
       "tip"
     ]
   }
 
 changelog/ shows information about several changesets
 
   $ request json-changelog
   200 Script output follows
   
   {
     "changeset_count": 10,
     "changesets": [
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "merge test-branch into default",
         "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
         "tags": [
           "tip"
         ],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "another commit in test-branch",
         "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "create test branch",
         "node": "6ab967a8ab3489227a83f80e920faa039a71819f",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [
           "bookmark2"
         ],
         "date": [
           0.0,
           0
         ],
         "desc": "create tag2",
         "node": "ceed296fe500c3fac9541e31dad860cb49c89e45",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "another commit to da/foo",
         "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
         "tags": [
           "tag2"
         ],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "create tag",
         "node": "93a8ce14f89156426b7fa981af8042da53f03aa0",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "move foo",
         "node": "78896eb0e102174ce9278438a95e12543e4367a7",
         "tags": [
           "tag1"
         ],
         "user": "test"
       },
       {
         "bookmarks": [
           "bookmark1"
         ],
         "date": [
           0.0,
           0
         ],
         "desc": "modify da/foo",
         "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "modify foo",
         "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "initial",
         "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
         "tags": [],
         "user": "test"
       }
     ],
     "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7"
   }
 
 changelog/{revision} shows information starting at a specific changeset
 
   $ request json-changelog/f8bbb9024b10
   200 Script output follows
   
   {
     "changeset_count": 10,
     "changesets": [
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "modify foo",
         "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "initial",
         "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
         "tags": [],
         "user": "test"
       }
     ],
     "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8"
   }
 
 shortlog/ shows information about a set of changesets
 
   $ request json-shortlog
   200 Script output follows
   
   {
     "changeset_count": 10,
     "changesets": [
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "merge test-branch into default",
         "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
         "tags": [
           "tip"
         ],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "another commit in test-branch",
         "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "create test branch",
         "node": "6ab967a8ab3489227a83f80e920faa039a71819f",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [
           "bookmark2"
         ],
         "date": [
           0.0,
           0
         ],
         "desc": "create tag2",
         "node": "ceed296fe500c3fac9541e31dad860cb49c89e45",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "another commit to da/foo",
         "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
         "tags": [
           "tag2"
         ],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "create tag",
         "node": "93a8ce14f89156426b7fa981af8042da53f03aa0",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "move foo",
         "node": "78896eb0e102174ce9278438a95e12543e4367a7",
         "tags": [
           "tag1"
         ],
         "user": "test"
       },
       {
         "bookmarks": [
           "bookmark1"
         ],
         "date": [
           0.0,
           0
         ],
         "desc": "modify da/foo",
         "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "modify foo",
         "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
         "tags": [],
         "user": "test"
       },
       {
         "bookmarks": [],
         "date": [
           0.0,
           0
         ],
         "desc": "initial",
         "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
         "tags": [],
         "user": "test"
       }
     ],
     "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7"
   }
 
 changeset/ renders the tip changeset
 
   $ request json-rev
   200 Script output follows
   
   {
     "bookmarks": [],
     "branch": "default",
     "date": [
       0.0,
       0
     ],
     "desc": "merge test-branch into default",
     "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
     "parents": [
       "ceed296fe500c3fac9541e31dad860cb49c89e45",
       "ed66c30e87eb65337c05a4229efaa5f1d5285a90"
     ],
     "phase": "draft",
     "tags": [
       "tip"
     ],
     "user": "test"
   }
 
 changeset/{revision} shows tags
 
   $ request json-rev/78896eb0e102
   200 Script output follows
   
   {
     "bookmarks": [],
     "branch": "default",
     "date": [
       0.0,
       0
     ],
     "desc": "move foo",
     "node": "78896eb0e102174ce9278438a95e12543e4367a7",
     "parents": [
       "8d7c456572acf3557e8ed8a07286b10c408bcec5"
     ],
     "phase": "public",
     "tags": [
       "tag1"
     ],
     "user": "test"
   }
 
 changeset/{revision} shows bookmarks
 
   $ request json-rev/8d7c456572ac
   200 Script output follows
   
   {
     "bookmarks": [
       "bookmark1"
     ],
     "branch": "default",
     "date": [
       0.0,
       0
     ],
     "desc": "modify da/foo",
     "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5",
     "parents": [
       "f8bbb9024b10f93cdbb8d940337398291d40dea8"
     ],
     "phase": "public",
     "tags": [],
     "user": "test"
   }
 
 changeset/{revision} shows branches
 
   $ request json-rev/6ab967a8ab34
   200 Script output follows
   
   {
     "bookmarks": [],
     "branch": "test-branch",
     "date": [
       0.0,
       0
     ],
     "desc": "create test branch",
     "node": "6ab967a8ab3489227a83f80e920faa039a71819f",
     "parents": [
       "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
     ],
     "phase": "draft",
     "tags": [],
     "user": "test"
   }
 
 manifest/{revision}/{path} shows info about a directory at a revision
 
   $ request json-manifest/06e557f3edf6/
   200 Script output follows
   
   {
     "abspath": "/",
     "bookmarks": [],
     "directories": [
       {
         "abspath": "/da",
         "basename": "da",
         "emptydirs": ""
       }
     ],
     "files": [
       {
         "abspath": "foo",
         "basename": "foo",
         "date": [
           0.0,
           0
         ],
         "flags": "",
         "size": 4
       }
     ],
     "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
     "tags": []
   }
 
 tags/ shows tags info
 
   $ request json-tags
   200 Script output follows
   
   {
     "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
     "tags": [
       {
         "date": [
           0.0,
           0
         ],
         "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
         "tag": "tag2"
       },
       {
         "date": [
           0.0,
           0
         ],
         "node": "78896eb0e102174ce9278438a95e12543e4367a7",
         "tag": "tag1"
       }
     ]
   }
 
 bookmarks/ shows bookmarks info
 
   $ request json-bookmarks
   200 Script output follows
   
   {
     "bookmarks": [
       {
         "bookmark": "bookmark1",
         "date": [
           0.0,
           0
         ],
         "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5"
       },
       {
         "bookmark": "bookmark2",
         "date": [
           0.0,
           0
         ],
         "node": "ceed296fe500c3fac9541e31dad860cb49c89e45"
       }
     ],
     "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7"
   }
 
 branches/ shows branches info
 
   $ request json-branches
   200 Script output follows
   
   {
     "branches": [
       {
         "branch": "default",
         "date": [
           0.0,
           0
         ],
         "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
         "status": "open"
       },
       {
         "branch": "test-branch",
         "date": [
           0.0,
           0
         ],
         "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
         "status": "inactive"
       }
     ]
   }
 
 summary/ shows a summary of repository state
 
   $ request json-summary
   200 Script output follows
   
   "not yet implemented"
 
 filediff/{revision}/{path} shows changes to a file in a revision
 
   $ request json-diff/f8bbb9024b10/foo
   200 Script output follows
   
-  "not yet implemented"
+  {
+    "author": "test",
+    "children": [],
+    "date": [
+      0.0,
+      0
+    ],
+    "desc": "modify foo",
+    "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": "+bar\n",
+            "n": 5,
+            "t": "+"
+          }
+        ]
+      }
+    ],
+    "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
+    "parents": [
+      "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
+    ],
+    "path": "foo"
+  }
 
 comparison/{revision}/{path} shows information about before and after for a file
 
   $ request json-comparison/f8bbb9024b10/foo
   200 Script output follows
   
   "not yet implemented"
 
 annotate/{revision}/{path} shows annotations for each line
 
   $ request json-annotate/f8bbb9024b10/foo
   200 Script output follows
   
   "not yet implemented"
 
 filelog/{revision}/{path} shows history of a single file
 
   $ request json-filelog/f8bbb9024b10/foo
   200 Script output follows
   
   "not yet implemented"
 
 (archive/ doesn't use templating, so ignore it)
 
 (static/ doesn't use templating, so ignore it)
 
 graph/ shows information that can be used to render a graph of the DAG
 
   $ request json-graph
   200 Script output follows
   
   "not yet implemented"
 
 help/ shows help topics
 
   $ request json-help
   200 Script output follows
   
   {
     "earlycommands": [
       {
         "summary": "add the specified files on the next commit",
         "topic": "add"
       },
       {
         "summary": "show changeset information by line for each file",
         "topic": "annotate"
       },
       {
         "summary": "make a copy of an existing repository",
         "topic": "clone"
       },
       {
         "summary": "commit the specified files or all outstanding changes",
         "topic": "commit"
       },
       {
         "summary": "diff repository (or selected files)",
         "topic": "diff"
       },
       {
         "summary": "dump the header and diffs for one or more changesets",
         "topic": "export"
       },
       {
         "summary": "forget the specified files on the next commit",
         "topic": "forget"
       },
       {
         "summary": "create a new repository in the given directory",
         "topic": "init"
       },
       {
         "summary": "show revision history of entire repository or files",
         "topic": "log"
       },
       {
         "summary": "merge another revision into working directory",
         "topic": "merge"
       },
       {
         "summary": "pull changes from the specified source",
         "topic": "pull"
       },
       {
         "summary": "push changes to the specified destination",
         "topic": "push"
       },
       {
         "summary": "remove the specified files on the next commit",
         "topic": "remove"
       },
       {
         "summary": "start stand-alone webserver",
         "topic": "serve"
       },
       {
         "summary": "show changed files in the working directory",
         "topic": "status"
       },
       {
         "summary": "summarize working directory state",
         "topic": "summary"
       },
       {
         "summary": "update working directory (or switch revisions)",
         "topic": "update"
       }
     ],
     "othercommands": [
       {
         "summary": "add all new files, delete all missing files",
         "topic": "addremove"
       },
       {
         "summary": "create an unversioned archive of a repository revision",
         "topic": "archive"
       },
       {
         "summary": "reverse effect of earlier changeset",
         "topic": "backout"
       },
       {
         "summary": "subdivision search of changesets",
         "topic": "bisect"
       },
       {
         "summary": "create a new bookmark or list existing bookmarks",
         "topic": "bookmarks"
       },
       {
         "summary": "set or show the current branch name",
         "topic": "branch"
       },
       {
         "summary": "list repository named branches",
         "topic": "branches"
       },
       {
         "summary": "create a changegroup file",
         "topic": "bundle"
       },
       {
         "summary": "output the current or given revision of files",
         "topic": "cat"
       },
       {
         "summary": "show combined config settings from all hgrc files",
         "topic": "config"
       },
       {
         "summary": "mark files as copied for the next commit",
         "topic": "copy"
       },
       {
         "summary": "list tracked files",
         "topic": "files"
       },
       {
         "summary": "copy changes from other branches onto the current branch",
         "topic": "graft"
       },
       {
         "summary": "search for a pattern in specified files and revisions",
         "topic": "grep"
       },
       {
         "summary": "show branch heads",
         "topic": "heads"
       },
       {
         "summary": "show help for a given topic or a help overview",
         "topic": "help"
       },
       {
         "summary": "identify the working directory or specified revision",
         "topic": "identify"
       },
       {
         "summary": "import an ordered set of patches",
         "topic": "import"
       },
       {
         "summary": "show new changesets found in source",
         "topic": "incoming"
       },
       {
         "summary": "output the current or given revision of the project manifest",
         "topic": "manifest"
       },
       {
         "summary": "show changesets not found in the destination",
         "topic": "outgoing"
       },
       {
         "summary": "show aliases for remote repositories",
         "topic": "paths"
       },
       {
         "summary": "set or show the current phase name",
         "topic": "phase"
       },
       {
         "summary": "roll back an interrupted transaction",
         "topic": "recover"
       },
       {
         "summary": "rename files; equivalent of copy + remove",
         "topic": "rename"
       },
       {
         "summary": "redo merges or set/view the merge status of files",
         "topic": "resolve"
       },
       {
         "summary": "restore files to their checkout state",
         "topic": "revert"
       },
       {
         "summary": "print the root (top) of the current working directory",
         "topic": "root"
       },
       {
         "summary": "add one or more tags for the current or given revision",
         "topic": "tag"
       },
       {
         "summary": "list repository tags",
         "topic": "tags"
       },
       {
         "summary": "apply one or more changegroup files",
         "topic": "unbundle"
       },
       {
         "summary": "verify the integrity of the repository",
         "topic": "verify"
       },
       {
         "summary": "output version and copyright information",
         "topic": "version"
       }
     ],
     "topics": [
       {
         "summary": "Configuration Files",
         "topic": "config"
       },
       {
         "summary": "Date Formats",
         "topic": "dates"
       },
       {
         "summary": "Diff Formats",
         "topic": "diffs"
       },
       {
         "summary": "Environment Variables",
         "topic": "environment"
       },
       {
         "summary": "Using Additional Features",
         "topic": "extensions"
       },
       {
         "summary": "Specifying File Sets",
         "topic": "filesets"
       },
       {
         "summary": "Glossary",
         "topic": "glossary"
       },
       {
         "summary": "Syntax for Mercurial Ignore Files",
         "topic": "hgignore"
       },
       {
         "summary": "Configuring hgweb",
         "topic": "hgweb"
       },
       {
         "summary": "Merge Tools",
         "topic": "merge-tools"
       },
       {
         "summary": "Specifying Multiple Revisions",
         "topic": "multirevs"
       },
       {
         "summary": "File Name Patterns",
         "topic": "patterns"
       },
       {
         "summary": "Working with Phases",
         "topic": "phases"
       },
       {
         "summary": "Specifying Single Revisions",
         "topic": "revisions"
       },
       {
         "summary": "Specifying Revision Sets",
         "topic": "revsets"
       },
       {
         "summary": "Subrepositories",
         "topic": "subrepos"
       },
       {
         "summary": "Template Usage",
         "topic": "templating"
       },
       {
         "summary": "URL Paths",
         "topic": "urls"
       }
     ]
   }
 
 help/{topic} shows an individual help topic
 
   $ request json-help/phases
   200 Script output follows
   
   {
     "rawdoc": "Working with Phases\n*", (glob)
     "topic": "phases"
   }