commands: use the new API to access hidden changesets in various commands

In previous patches, we have added an internal API to unhide hidden changesets.
This patch makes the following command use that api in nowarn mode i.e. there
will be no warning while accessing hidden changesets.

cat, diff, export, files, heads, identify, log, manifest, parents, status

This patch also adds test demonstarting the behaviour.

.. feature:: Accessing hidden changesets

    Set config option 'experimental.directaccess = True' to access hidden
    changesets from read only commands.

Differential Revision: https://phab.mercurial-scm.org/D1735

tests/test-directaccess.t

@@ -0,0 +1,156 b''
+Tests for access level on hidden commits by various commands on based of their
+type.
+
+Setting the required config to start this
+
+  $ cat >> $HGRCPATH <<EOF
+  > [experimental]
+  > evolution=createmarkers, allowunstable
+  > directaccess=True
+  > directaccess.revnums=True
+  > [extensions]
+  > amend =
+  > EOF
+
+  $ hg init repo
+  $ cd repo
+  $ for ch in a b c; do touch $ch; echo "foo" >> $ch; hg ci -Aqm "Added "$ch; done
+
+  $ hg log -G -T '{rev}:{node} {desc}' --hidden
+  @  2:28ad74487de9599d00d81085be739c61fc340652 Added c
+  |
+  o  1:29becc82797a4bc11ec8880b58eaecd2ab3e7760 Added b
+  |
+  o  0:18d04c59bb5d2d4090ad9a5b59bd6274adb63add Added a
+  
+  $ echo "bar" >> c
+  $ hg amend
+
+  $ hg log -G -T '{rev}:{node} {desc}' --hidden
+  @  3:2443a0e664694756d8b435d06b6ad84f941b6fc0 Added c
+  |
+  | x  2:28ad74487de9599d00d81085be739c61fc340652 Added c
+  |/
+  o  1:29becc82797a4bc11ec8880b58eaecd2ab3e7760 Added b
+  |
+  o  0:18d04c59bb5d2d4090ad9a5b59bd6274adb63add Added a
+  
+Testing read only commands on the hidden revision
+
+Testing with rev number
+
+  $ hg exp 2 --config experimental.directaccess.revnums=False
+  abort: hidden revision '2'!
+  (use --hidden to access hidden revisions)
+  [255]
+
+  $ hg exp 2
+  # HG changeset patch
+  # User test
+  # Date 0 0
+  #      Thu Jan 01 00:00:00 1970 +0000
+  # Node ID 28ad74487de9599d00d81085be739c61fc340652
+  # Parent  29becc82797a4bc11ec8880b58eaecd2ab3e7760
+  Added c
+  
+  diff -r 29becc82797a -r 28ad74487de9 c
+  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/c	Thu Jan 01 00:00:00 1970 +0000
+  @@ -0,0 +1,1 @@
+  +foo
+
+  $ hg log -r 2
+  changeset:   2:28ad74487de9
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  obsolete:    rewritten using amend as 3:2443a0e66469
+  summary:     Added c
+  
+  $ hg identify -r 2
+  28ad74487de9
+
+  $ hg status --change 2
+  A c
+
+  $ hg status --change 2 --config experimental.directaccess.revnums=False
+  abort: hidden revision '2'!
+  (use --hidden to access hidden revisions)
+  [255]
+
+  $ hg diff -c 2
+  diff -r 29becc82797a -r 28ad74487de9 c
+  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/c	Thu Jan 01 00:00:00 1970 +0000
+  @@ -0,0 +1,1 @@
+  +foo
+
+Testing with hash
+
+`hg export`
+
+  $ hg exp 28ad74
+  # HG changeset patch
+  # User test
+  # Date 0 0
+  #      Thu Jan 01 00:00:00 1970 +0000
+  # Node ID 28ad74487de9599d00d81085be739c61fc340652
+  # Parent  29becc82797a4bc11ec8880b58eaecd2ab3e7760
+  Added c
+  
+  diff -r 29becc82797a -r 28ad74487de9 c
+  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/c	Thu Jan 01 00:00:00 1970 +0000
+  @@ -0,0 +1,1 @@
+  +foo
+
+`hg log`
+
+  $ hg log -r 28ad74
+  changeset:   2:28ad74487de9
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  obsolete:    rewritten using amend as 3:2443a0e66469
+  summary:     Added c
+  
+`hg cat`
+
+  $ hg cat -r 28ad74 c
+  foo
+
+`hg diff`
+
+  $ hg diff -c 28ad74
+  diff -r 29becc82797a -r 28ad74487de9 c
+  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/c	Thu Jan 01 00:00:00 1970 +0000
+  @@ -0,0 +1,1 @@
+  +foo
+
+`hg files`
+
+  $ hg files -r 28ad74
+  a
+  b
+  c
+
+`hg identify`
+
+  $ hg identify -r 28ad74
+  28ad74487de9
+
+`hg status`
+
+  $ hg status --change 28ad74
+  A c
+
+Commands with undefined cmdtype should not work right now
+
+  $ hg phase -r 28ad74
+  abort: hidden revision '28ad74'!
+  (use --hidden to access hidden revisions)
+  [255]
+
+  $ hg phase -r 2
+  abort: hidden revision '2'!
+  (use --hidden to access hidden revisions)
+  [255]

mercurial/commands.py

@@ -1279,7 +1279,9 b' def cat(ui, repo, file1, *pats, **opts):'
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
-    ctx = scmutil.revsingle(repo, opts.get('rev'))
+    rev = opts.get('rev')
+    repo = scmutil.unhidehashlikerevs(repo, [rev], 'nowarn')
+    ctx = scmutil.revsingle(repo, rev)
     m = scmutil.match(ctx, (file1,) + pats, opts)
     fntemplate = opts.pop('output', '')
     if cmdutil.isstdiofilename(fntemplate):
@@ -1840,9 +1842,11 b' def diff(ui, repo, *pats, **opts):'
         msg = _('cannot specify --rev and --change at the same time')
         raise error.Abort(msg)
     elif change:
+        repo = scmutil.unhidehashlikerevs(repo, [change], 'nowarn')
         node2 = scmutil.revsingle(repo, change, None).node()
         node1 = repo[node2].p1().node()
     else:
+        repo = scmutil.unhidehashlikerevs(repo, revs, 'nowarn')
         node1, node2 = scmutil.revpair(repo, revs)
 
     if reverse:
@@ -1926,6 +1930,7 b' def export(ui, repo, *changesets, **opts'
     changesets += tuple(opts.get('rev', []))
     if not changesets:
         changesets = ['.']
+    repo = scmutil.unhidehashlikerevs(repo, changesets, 'nowarn')
     revs = scmutil.revrange(repo, changesets)
     if not revs:
         raise error.Abort(_("export requires at least one changeset"))
@@ -1989,7 +1994,9 b' def files(ui, repo, *pats, **opts):'
     """
 
     opts = pycompat.byteskwargs(opts)
-    ctx = scmutil.revsingle(repo, opts.get('rev'), None)
+    rev = opts.get('rev')
+    repo = scmutil.unhidehashlikerevs(repo, [rev], 'nowarn')
+    ctx = scmutil.revsingle(repo, rev, None)
 
     end = '\n'
     if opts.get('print0'):
@@ -2586,8 +2593,10 b' def heads(ui, repo, *branchrevs, **opts)'
 
     opts = pycompat.byteskwargs(opts)
     start = None
-    if 'rev' in opts:
-        start = scmutil.revsingle(repo, opts['rev'], None).node()
+    rev = opts.get('rev')
+    if rev:
+        repo = scmutil.unhidehashlikerevs(repo, [rev], 'nowarn')
+        start = scmutil.revsingle(repo, rev, None).node()
 
     if opts.get('topo'):
         heads = [repo[h] for h in repo.heads(start)]
@@ -2770,6 +2779,7 b' def identify(ui, repo, source=None, rev='
         fm.data(node=hex(remoterev))
         fm.data(bookmarks=fm.formatlist(bms, name='bookmark'))
     else:
+        repo = scmutil.unhidehashlikerevs(repo, [rev], 'nowarn')
         ctx = scmutil.revsingle(repo, rev, None)
 
         if ctx.rev() is None:
@@ -3395,6 +3405,7 b' def log(ui, repo, *pats, **opts):'
             raise error.Abort(_('graph not supported with line range patterns'))
         return cmdutil.graphlog(ui, repo, pats, opts)
 
+    repo = scmutil.unhidehashlikerevs(repo, opts.get('rev'), 'nowarn')
     revs, expr, filematcher = cmdutil.getlogrevs(repo, pats, opts)
     hunksfilter = None
 
@@ -3502,6 +3513,7 b' def manifest(ui, repo, node=None, rev=No'
 
     char = {'l': '@', 'x': '*', '': ''}
     mode = {'l': '644', 'x': '755', '': '644'}
+    repo = scmutil.unhidehashlikerevs(repo, [node], 'nowarn')
     ctx = scmutil.revsingle(repo, node)
     mf = ctx.manifest()
     ui.pager('manifest')
@@ -3689,7 +3701,9 b' def parents(ui, repo, file_=None, **opts'
     """
 
     opts = pycompat.byteskwargs(opts)
-    ctx = scmutil.revsingle(repo, opts.get('rev'), None)
+    rev = opts.get('rev')
+    repo = scmutil.unhidehashlikerevs(repo, [rev], 'nowarn')
+    ctx = scmutil.revsingle(repo, rev, None)
 
     if file_:
         m = scmutil.match(ctx, (file_,), opts)
@@ -4841,9 +4855,11 b' def status(ui, repo, *pats, **opts):'
         msg = _('cannot use --terse with --rev')
         raise error.Abort(msg)
     elif change:
+        repo = scmutil.unhidehashlikerevs(repo, [change], 'nowarn')
         node2 = scmutil.revsingle(repo, change, None).node()
         node1 = repo[node2].p1().node()
     else:
+        repo = scmutil.unhidehashlikerevs(repo, revs, 'nowarn')
         node1, node2 = scmutil.revpair(repo, revs)
 
     if pats or ui.configbool('commands', 'status.relative'):