Move cmdtable and reposetup handling out of extensions.py
A new function (extensions.extensions) allows the code that is
interested in those attributes to handle them directly.
This allows some cleanups of extensions.py. Notably, we can
remove the extensions.commandtable hack.
It also makes it easier to add standard extension attributes,
like a "hgwebsetup" function or a "helptable" dict that augments
the data in help.py, etc.
adding foo
>>> two diffs showing three added lines <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
+
hello world
+
goodbye world
+
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
+
hello world
+
goodbye world
+
>>> no diffs <<<
hg diff -B
hg diff -Bb
>>> four diffs showing added space first on the first line <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
>>> two diffs showing space appended to the first line <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+hello world
goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+hello world
goodbye world
>>> no diffs <<<
hg diff -b
hg diff -Bb
>>> four diffs showing space inserted into "goodbye" <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
>>> two diffs showing changed whitespace amount in the last line <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+goodbye world
>>> no diffs <<<
hg diff -b
hg diff -Bb
>>> four diffs showing added blank line w/horizontal space <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
hello world
+
goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
hello world
+
goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
hello world
+
goodbye world
hg diff -Bb
>>> three diffs showing added blank line w/other space <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
-hello world
-goodbye world
+hello world
+
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
-hello world
-goodbye world
+hello world
+
+goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
-hello world
-goodbye world
+hello world
+
+goodbye world
hg diff -Bb
>>> four diffs showing changed whitespace <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -w
>>> five diffs showing changed whitespace <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -w
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -wB