- HTML-escape URL paths
- URL-escape URL parameters

R=bradfitz
CC=golang-dev
https://golang.org/cl/4890041

This is useful for applications that want to micromanage the rpc service.
Moved part of ServeCodec into a new readRequest function.
Renamed existing readRequest to readRequestHeader, and reordered
its parameters to align with the new readRequest and service.call.

R=golang-dev, r, rsc, sougou
CC=golang-dev, msolomon
https://golang.org/cl/4889043

Do this by adding a fake package called builtin. At the moment, godoc will
not present this documentation because the function names are all lower case,
but there are plans to address this.
The print and println functions are undocumented here. I could be talked
into doing them but I'd rather not promote their use.

R=dsymonds, n13m3y3r, r, gri, rsc
CC=golang-dev
https://golang.org/cl/4907041

R=rsc
CC=golang-dev
https://golang.org/cl/4904044

CL 4873048 introduced the ability to build without hg and
getting an "unknown" version.  While this approach works
to avoid the hg dependency, it also means that every
exported tree that is built without hg or .hg will have not
only missing information, but will also be compatible to
one another.  Considering that it is a common practice to
remove the VCS data in distributions, I suggest we don't
take this approach to avoid its consequences.

This CL fixes the same problem in a different way: if a
VERSION file at the top of the tree exists, use it at
all times.  If it doesn't, fall back to using information
from hg necessarily, and fail if that's not possible.  The
error message when VERSION and hg are not available
instructs users to handle it properly.

The VERSION file can be generated with
"src/version.bash -save" while hg is still around.

R=golang-dev, rsc, gustavo
CC=golang-dev
https://golang.org/cl/4897043

This was initially pushed as part of CL 4876046, found
when logic in exp/template was using the method on
an Invalid value.

R=rsc
CC=golang-dev
https://golang.org/cl/4890043

R=golang-dev, dsymonds, n13m3y3r
CC=golang-dev
https://golang.org/cl/4873048

Fixes #2152.

R=golang-dev, dvyukov
CC=golang-dev
https://golang.org/cl/4888044

First step of moving exp/template into template: save the old code.
Code is unedited except for target name in Makefile.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4893042

While using exp/template in practice, the syntax for
indexing values using the "index" action was found to be
very inconvenient for frequent use when handling dynamic
data from maps such as the ones used with json and yaml,
that use a type like map[string]interface{}.

For these kinds of maps, the default handling of fields as
{{.Field}} makes the task of handling the several references
significantly more pleasant and elegant, and is equivalent
to what's currently done in the "template" package and in
other external packages (e.g. mustache).

Even with this change, the index action is still relevant
as it allows indexing maps in other scenarios where keys
wouldn't be valid field names.

R=golang-dev, r, gustavo
CC=golang-dev
https://golang.org/cl/4898043

This avoids a non-obvious panic when range is used on a
nil interface, and fixes it by behaving as if the range
was empty.

The new behavior is equivalent to the outcome of iterating
on a nil map or slice, and is useful because it allows
generic structures such as used in json (map[string]interface{})
to behave correctly if a key generally set to a list or map
isn't present.

R=golang-dev, r, gustavo
CC=golang-dev
https://golang.org/cl/4876046

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4895042

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4875048

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4901041

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4898042

R=r, rsc
CC=golang-dev
https://golang.org/cl/4873046

Since the posLink_url also adds a non-URL attribute, the quoting and  URL-escaping
must happen inside posLink_url (otherwise the non-URL attribute becomes part or the
URL portion of the tag.

R=r
CC=golang-dev
https://golang.org/cl/4888041

- rename template funcs for better consistency and
  sort them into groups of related functionality
- try to be more consistent with html vs url escaping

R=r
CC=golang-dev
https://golang.org/cl/4887041

- simplified pipelines
- simplified templates by using template variables
- converted most old-style formatters into new-style funcs
- fixed some escaping bugs (use of url escaping where it was missing)

R=r, dsymonds
CC=golang-dev
https://golang.org/cl/4868044

R=r, r
CC=golang-dev
https://golang.org/cl/4837071

R=r, r
CC=golang-dev
https://golang.org/cl/4837071

R=gri, dsymonds
CC=golang-dev
https://golang.org/cl/4881042

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4837048

func Reverse(*Template) *Template
returns a template that produces the reverse of the original
for any input.

Changes outside exp/template/html include:
- Adding a getter for a template's FuncMap so that derived templates
  can inherit function definitions.
- Exported one node factory function, newIdentifier.
  Deriving tempaltes requires constructing new nodes, but I didn't
  export all of them because I think shallow copy functions might
  be more useful for this kind of work.
- Bugfix: Template's Name() method ignores the name field so
  template.New("foo") is a nil dereference instead of "foo".

Caveats: Reverse is a toy.  It is not UTF-8 safe, and does not
preserve order of calls to funcs in FuncMap.

For context, see http://groups.google.com/group/golang-nuts/browse_thread/thread/e8bc7c771aae3f20/b1ac41dc6f609b6e?lnk=gst

R=rsc, r, nigeltao, r
CC=golang-dev
https://golang.org/cl/4808089

R=golang-dev, dsymonds
CC=golang-dev, mikesamuel
https://golang.org/cl/4875042

R=r
CC=golang-dev
https://golang.org/cl/4878042

How quaint.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4874045

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4868045

- first step; rough conversion of all template files
- there is plenty of opportunity for cleanups/simplifications (next CLs)
- html and text output as before

R=r, dsymonds
CC=golang-dev
https://golang.org/cl/4852048

This continues the work in revision 914a659b44ff, now passing more test
cases. As before, the new tokenization tests match html5lib's behavior.

Fixes #2124.

R=dsymonds, r
CC=golang-dev
https://golang.org/cl/4867042

Also simplify nil handling in printing.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4869042

IMPORTANT: Previous usage of *Files will continue to compile
fine but misbehave since the interface is compatible.

The following functions have been renamed:

    ParseFiles => ParseGlob
    ParseFile => ParseFiles
    ParseSetFiles => ParseSetGlob
    ParseSetFile => ParseSetFiles
    ParseTemplateFiles => ParseTemplateGlob
    ParseTemplateFile => ParseTemplateFiles

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4867041

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4859042

Not sure how to detect read-only but at least
this pins the blame on the hg server.

R=r, bradfitz
CC=golang-dev
https://golang.org/cl/4847053

R=bradfitz, dsymonds, fshahriar
CC=golang-dev
https://golang.org/cl/4859043

Also protect against invalid (zero Value) reflect.Values.

R=rsc, gri
CC=golang-dev
https://golang.org/cl/4810094

Fixes #2140.

The http.DefaultTransport's RoundTrip method leaves the http.Request object
in an altered state after performing the round trip.  This patch removes
the header from the Request before returning to the client.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4857041

R=rsc
CC=golang-dev
https://golang.org/cl/4855051

Addresses part of issue 2093
Thanks to espians....@

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/4808087

- triegen.go: Factored out trie generation code from maketables.go
  (only renamed printTrieTables to printTables and made it a method).
- maketesttables.go: new tool to generate data for the trie unit test.
- Makefile: changed accordingly.
- trie.go: trie lookup code.
- trietest_data.go: generated by maketesttables.go.
- trie_test.go: unit test for trie.go.

R=r
CC=golang-dev
https://golang.org/cl/4844053