<!--
This template is for tracking a release of VTKm.

Process this file with the pyexpander script specifying the desired `version`:

expander.py --eval 'version="1.9.0-rc1"' docs/NewRelease.md.tmpl | xclip -selection c

Please remove this comment.
-->
$py(VERSION=str(version.partition("-")[0]))\
$py(MAJOR=int(VERSION.split(".")[0]))\
$py(MINOR=int(VERSION.split(".")[1]))\
$py(PATCH=int(VERSION.split(".")[2]))\
$py(RC="".join(version.partition("-")[1:3]))\
$if(PATCH == 0 and RC == "")\
## Prerequisites

- [ ] Make sure that the current VTK-m release branch builds in VTK.
- [ ] Make sure that the current VTK-m release branch builds in ECP Ascent.

$endif\
## Update VTK-m

- [ ] Update `release` branch for **vtk-m** and create update branch
```
git fetch origin
git checkout release
git merge --ff-only origin/release
git submodule update --recursive --init
```
$if(PATCH == 0 and RC == "-rc1")\
- [ ] Update `master` branch for **vtk-m** and create update branch
```
git fetch origin
git checkout master
git merge --ff-only origin/master
git submodule update --recursive --init
```
$endif\

## Create update branch

- [ ] Freeze the release branch (In Gitlab VTK-m page)
  - Settings/Repository/Protected Branches: Release; "allowed to push:No one"
- [ ] Create update branch `git checkout -b update-to-$(VERSION)`
$if(PATCH == 0 and RC == "-rc1")\
- [ ] Bring as a second parent the history of master (Solve conflicts always
      taking master's version)
```
git merge --no-ff origin/master
```
$else\
- [ ] Backport merge-requests belonging to the milestone $(VERSION)
$endif\
$if(PATCH == 0)\
- [ ] Set version to master
```
echo "$(MAJOR).$(MINOR).9999" > version.txt
git add version.txt
```
$endif\

- [ ] Update the version (not in patch releases) and date in the LICENSE.md
      file `git add LICENSE.md`.
- [ ] Create commit that updates the License (and version.txt if modified):
```
git commit -m 'release: update version and License'
```

<!-- Do we have new release notes? -->
- [ ] Craft or update [changelog](#generate-change-log)
      `docs/changelog/$(VERSION)/release-notes.md` file.
- [ ] Create release notes commit.
```
git add docs/changelog/$(MAJOR).$(MINOR)/release-notes.md
git rm docs/changelog/*.md
git commit -m 'release: $(VERSION)$(RC) release notes'
```
<!-- endif -->
- [ ] Create update version commit:

```
echo $(VERSION)$(RC) > version.txt
git add version.txt

# Create commit with the following template
# Nth is counted by the number of final release tags
git commit -m '$(VERSION)$(RC) is our Nth official release of VTK-m.

The major changes to VTK-m from (previous release) can be found in:
  docs/changelog/$(VERSION)/release-notes.md' version.txt
```

- [ ] `git tag -a -m 'VTKm $(VERSION)$(RC)' v$(VERSION)$(RC) HEAD`
- Integrate changes to `release` branch
  - [ ] Create a MR using the [release-mr script][1]
        (see [notes](#notes-about-update-mr)).
$if(PATCH == 0)\
  - [ ] Add (or ensure) at the bottom of the description of the merge request:
        `Backport: master:HEAD~1`
$else\
  - [ ] Remove (or ensure) that at the bottom of the description of the merge
        request there is no `Backport` instruction.
$endif\
  - [ ] Get +1
  - [ ] `Do: merge`
- Push tags
  - [ ] `git push origin v$(VERSION)$(RC)`
- [ ] Unfreeze the release branch (In Gitlab VTK-m page)
  - Settings/Repository/Protected Branches: Release; "allowed to push: Maintainers"

## Update Spack
- [ ] Update Spack package: https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/vtk-m/package.py

## Post-release
$if(PATCH == 0 and RC == "-rc1")\
- [ ] Create a release-specific branch of the previous major/minor release (Ask
      @ben.boeckel). For more information on release-specific branch maintanance
      schedule refer to `docs/ReleaseRoadmap.md`.
$endif\
- [ ] Copy the contents of docs/changelog/$(VERSION)/release-notes.md to
      the GitLab release.
$if(PATCH == 0 and RC == "")\
- [ ] Tag new version of the [VTK-m User Guide][2].
$endif\
- [ ] Post an [Email Announcements](#email-announcements) VTK-m mailing list.
$if(RC == "")\
- [ ] Update this release Date, Delay and End-of-Support fields in `docs/ReleaseRoadmap.md`.
$endif\
$if(PATCH == 0)\
- [ ] Ensure that the content of `version.txt` in master is `$(MAJOR).$(MINOR).9999`.
$endif\

## Update VTK-m in VTK

VTK ships a particular VTK-m release in each of its releases, we need to open a
merge-request update the VTK-m commit in VTK as soon as possible even if the
newly VTK-m version does not correspond with the scheduled for the following VTK
release, the reason for opening the merge-request is that:

- We can test how compatible it is with VTK giving us the change to address
  those issues in the following releases.
- We do not forget to update VTK-m commit in VTK when the time comes

 - [ ] Update VTK-m submodule in VTK using: `git submodule update --remote`

---

# Annex

## Generate change log
Construct a `docs/changelog/$(VERSION)/` folder.
Construct a `docs/changelog/$(VERSION)/release-notes.md` file

Use the following template for `release-notes.md`:

```md
VTK-m N Release Notes
=======================

<!-- if is a patch release -->

| Merge request description                                           | Merge request id |
| ------------------------------------------------------------------- | ---------------- |
| Update the link to register with the VTK-m dashboard                | !2629            |
.
.
.
| CMAKE: CUDA ampere generate sm_80/86                                | !2688            |

<!-- else -->

# Table of Contents
1. [Core](#Core)
    - Core change 1
2. [ArrayHandle](#ArrayHandle)
3. [Control Environment](#Control-Environment)
4. [Execution Environment](#Execution-Environment)
5. [Worklets and Filters](#Worklets-and-Filters)
6. [Build](#Build)
7. [Other](#Other)

<!-- endif -->
# Core

## Core change 1 ##

changes in core 1

# ArrayHandle

# Control Enviornment

# Execution Environment

# Execution Environment

# Worklets and Filters

# Build


# Other
```

For each individual file in `docs/changelog` move them
to the relevant `release-notes` section.

  - Make sure each title and entry in the table of contents use full vtkm names
    `vtkm::cont::Field` instead of Field.
  - Make sure each title and entry DOESN'T have a period at the end.
  - Make sure any sub-heading as part of the changelog is transformed from `##`
    to `###`.
  - Entries for `Core` are reserved for large changes that significantly improve
    VTK-m users life, or are major breaking changes.

## Notes about update-mr

[`update-mr` script][1] has the following requirements to work:

1. It needs a token to for authentication (reach @ben.boeckel for this)
2. It needs `kwrobot.release.vtkm` to have developer perms in your vtk-m repo.

Lastly, `update-mr` can be used multiple times with different commit in the same
branch.

## Notes about version.txt

Master and release branch do not share the same version.txt scheme. In the
release branch the patch and release-candidate version is observed whereas in
master the patch field is fixed to _9999_ indicating that each of its commit is
a developing release.

- Master:  `$(MAJOR).$(MINOR).9999`
- Release: `$(MAJOR).$(MINOR).$(PATCH)$(RC)`

## Email Announcements

Announce the new VTK-m release on the mailing list. You will need to compute
the number of merge requests, changelog entries, and maybe # of authors.

Example to compute the number of unique committers
```
git log --format="%an" v1.4.0..v1.5.0 | sort -u | wc -l
```

Example to compute the number of merge requests
```
git log v1.4.0..v1.5.0 | grep 'Merge | wc -l
```

A standard template to use is:


```
Hi All,

VTK-m 1.5.0 is now released, and a special thanks to everyone that has
contributed to VTK-m since our last release. The 1.5.0 release contains
over 100000 merge requests, and 100000 entries to the changelog .

Below are all the entries in the changelog, with more details at (
https://gitlab.kitware.com/vtk/vtk-m/-/tags/v$(VERSION)) or in the vtkm
repository at `docs/$(VERSION)/release-notes.md`

$if(int(PATCH) > 0)\
- Update the link to register with the VTK-m dashboard
.
.
.
- CMAKE: CUDA ampere generate sm_80/86
$else\
1. Core
    - Core change 1
2. ArrayHandle
3. Control Environment
4. Execution Environment
5. Worklets and Filters
6. Build
7. Other
$endif\
```

[1]:  https://gitlab.kitware.com/utils/release-utils/-/blob/master/release-mr.py
[2]:  https://gitlab.kitware.com/vtk/vtk-m-user-guide

@ben.boeckel  
@vbolea  
/label ~"area:release"  
/milestone %"v$(VERSION)"  
/assign @vbolea