# Git, Versioning

## How to bump a version

0. ACT to check everything in
1. OBSERVE current versioning state

> - Be on master of (i) a direct clone or (ii) clone-of-fork with master up-to-date with upstream (including tags!!!) and with upstream as remote.
> - https://github.com/psi4/psi4/releases says `v1.1a1` & `007a9b6`

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>     >>> git tag
>     v1.0
>     v1.1a1

>     >>> cat psi4/metadata.py
>     __version__ = '1.1a1'
>     __version_long = '1.1a1+007a9b6'
>     __version_upcoming_annotated_v_tag = '1.1a2'

>     >>> git describe --abbrev=7 --long --always HEAD
>     v1.1a1-417-gcbee32b

>     >>> git describe --abbrev=7 --long --dirty
>     v1.1a1-417-gcbee32b

>     >>> ./psi4/versioner.py
>     Defining development snapshot version: 1.1a2.dev417+cbee32b (computed)
>     1.1a2.dev417 {master} cbee32b 1.0.0.999   1.0 <-- 1.1a2.dev417+cbee32b

>     >>> git diff

> - Observe that current latest tag matches metadata scipt and git describe, that GH releases matches metadata script, that upcoming in metadata script matches current versioner version.
> - Note that current tag is `v1.1a1`. Decide on imminent tag, say `v1.1rc1`.

2. ACT to bump tag in code

> - Edit current & prospective tag in psi4/psi4/metadata.py. Use your decided-upon tag `v1.1rc1` and a speculative next tag, say `v1.1rc2`, and use 7 “z”s for the part you can’t predict.

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>     >>> vi psi4/metadata.py

>     >>> git diff
>     diff --git a/psi4/metadata.py b/psi4/metadata.py
>     index 5d87b55..6cbc05e 100644
>     --- a/psi4/metadata.py
>     +++ b/psi4/metadata.py
>     @@ -1,6 +1,6 @@
>     -__version__ = '1.1a1'
>     -__version_long = '1.1a1+007a9b6'
>     -__version_upcoming_annotated_v_tag = '1.1a2'
>     +__version__ = '1.1rc1'
>     +__version_long = '1.1rc1+zzzzzzz'
>     +__version_upcoming_annotated_v_tag = '1.1rc2'

>     >>> git add psi4/metadata.py

>     >>> git commit -m "v1.1rc1"

3. OBSERVE undefined version state

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>     >>> git describe --abbrev=7 --long --always HEAD
>     v1.1a1-418-g6100822

>     >>>  git describe --abbrev=7 --long --dirty
>     v1.1a1-418-g6100822

>     >>>  psi4/versioner.py
>     Undefining version for irreconcilable tags: 1.1a1 (computed) vs 1.1rc1 (recorded)
>     undefined {master} 6100822 1.0.0.999   1.0 <-- undefined+6100822

> - Note 7-char git hash for the new commit, here “6100822”.

4. ACT to bump tag in git, then bump git tag in code.

> - Use the decided-upon tag `v1.1rc1` and the observed hash “6100822” to mint a new annotated tag, minding that “v”s are present here.
> - Use the observed hash to edit psi4/psi4/metadata.py and commit immediately.

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>     >>> git tag -a v1.1rc1 6100822 -m "v1.1rc1"

>     >>> vi psi4/metadata.py
>     >>> git diff
>     diff --git a/psi4/metadata.py b/psi4/metadata.py
>     index 6cbc05e..fdc202e 100644
>     --- a/psi4/metadata.py
>     +++ b/psi4/metadata.py
>     @@ -1,5 +1,5 @@
>      __version__ = '1.1rc1'
>     -__version_long = '1.1rc1+zzzzzzz'
>     +__version_long = '1.1rc1+6100822'
>      __version_upcoming_annotated_v_tag = '1.1rc2'

>     >>> psi4/versioner.py
>     Amazing, this can't actually happen that git hash stored at git commit.
>     >>> git add psi4/metadata.py
>     >>> git commit -m "Records tag for v1.1rc1"

5. OBSERVE current versioning state

> - Nothing to make note of, this is just a snapshot.

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>     >>> psi4/versioner.py
>     Defining development snapshot version: 1.1rc2.dev1+4e0596e (computed)
>     1.1rc2.dev1 {master} 4e0596e 1.0.0.999   1.0 <-- 1.1rc2.dev1+4e0596e

>     >>> git describe --abbrev=7 --long --always HEAD
>     v1.1rc1-1-g4e0596e

>     >>> git describe --abbrev=7 --long --dirty
>     v1.1rc1-1-g4e0596e

>     >>> git tag
>     v1.0
>     v1.1a1
>     v1.1rc1

>     >>> cat psi4/metadata.py
>     __version__ = '1.1rc1'
>     __version_long = '1.1rc1+6100822'
>     __version_upcoming_annotated_v_tag = '1.1rc2'

>     >>> cat metadata.out.py | head -8
>     __version__ = '1.1rc2.dev1'
>     __version_branch_name = 'master'
>     __version_cmake = '1.0.0.999'
>     __version_is_clean = 'True'
>     __version_last_release = '1.0'
>     __version_long = '1.1rc2.dev1+4e0596e'
>     __version_prerelease = 'False'
>     __version_release = 'False'

>     >>> git log --oneline
>     4e0596e Records tag for v1.1rc1
>     6100822 v1.1rc1
>     cbee32b Fixes pcmsolver/scf for py3. Moves source for libefp upstream.

6. ACT to inform remote of bump

> - Temporarily disengage “Include administrators” on protected master branch.

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>     >>> git push origin master
>     >>> git push origin v1.1rc1

> - Now https://github.com/psi4/psi4/releases says `v1.1rc1` & `6100822`

## How to create and remove an annotated Git tag on a remote

PSI4 versioning only works with annotated tags, not lightweight tags as are created with the GitHub interface

- Create annotated tag:

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      >>> git tag -a v1.1a1 <git hash if not current> -m "v1.1a1"
      >>> git push origin v1.1a1

- Delete tag:

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      >>> git tag -d v1.1a1
      >>> git push origin :refs/tags/v1.1a1

- Pull tags:

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      >>> git fetch <remote> 'refs/tags/*:refs/tags/*'

## What Psi4 version is running

- Psithon / from the executable:

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      >>> psi4 --version
      1.1rc2.dev17

- PsiAPI / from the library:

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      >>> python -c "import psi4; print(psi4.__version__)"
      1.1rc2.dev17

- Output file header gives info like the `print_header()` below.

- Function `print_header()` returns a summary of citation, version, and git information about PSI4. Function `version_formatter()` can return version and git information in any desired format string.

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      >>> import psi4
      >>> psi4.print_header()

          -----------------------------------------------------------------------
                Psi4: An Open-Source Ab Initio Electronic Structure Package
                                     Psi4 1.1rc2.dev17

                               Git: Rev {condadoc} c852257 dirty

          R. M. Parrish, L. A. Burns, D. G. A. Smith, A. C. Simmonett,
          A. E. DePrince III, E. G. Hohenstein, U. Bozkaya, A. Yu. Sokolov,
          R. Di Remigio, R. M. Richard, J. F. Gonthier, A. M. James,
          H. R. McAlexander, A. Kumar, M. Saitow, X. Wang, B. P. Pritchard,
          P. Verma, H. F. Schaefer III, K. Patkowski, R. A. King, E. F. Valeev,
          F. A. Evangelista, J. M. Turney, T. D. Crawford, and C. D. Sherrill,
          submitted.

          -----------------------------------------------------------------------

          Psi4 started on: Friday, 28 April 2017 07:31PM

          Process ID:  95107
          PSIDATADIR: /Users/johndoe/psi4/objdir8/stage/usr/local/psi4/share/psi4
          Memory:     500.0 MiB
          Threads:    1

      >>> psi4.version_formatter()
      '1.1rc2.dev17'
      >>> psi4.version_formatter('all')
      '1.1rc2.dev17 {condadoc} c852257 1.0.0.999 dirty  1.0 <-- 1.1rc2.dev17+c852257'
      >>> psi4.version_formatter("""{{{branch}}} {versionlong}""")
      '{condadoc} 1.1rc2.dev17+c852257'

## How to locate non-ascii characters in the codebase

Neither the Python interpreter nor Sphinx like non-ASCII characters one bit, though the errors may be intermittant. Output files are usually ok, so Jerome can live, for now. To aid in tracking down offenders, here’s the `vi` and `grep` search strings. In the docs, you want to use the substitutions in psi4/doc/sphinxman/source/abbr_accents.rst instead of the actual characters.

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    # vim
    :/[^\x00-\x7F]

    # bash
    grep -r --color='auto' -P -n "[^\x00-\x7F]" psi4/

## How to fix “Psi4 undefined” version

When in a git repo, the versioner uses `git describe` and psi4/metadata.py to compute the version. If you don’t have all the latest tags, this mechanism can’t work. To solve, pull tags and remake.

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    # upstream in `git remote -v` points to github.com/psi4/psi4.git
    >>> git fetch upstream 'refs/tags/*:refs/tags/*'
    >>> make
    # version healed

## How to fix “cannot import name ‘core’ from {top-level-psi4-dir}

First, what’s happening? `sys.path` (where modules can be imported from in python) starts with `''`. If you export PYTHONPATH={objdir}/stage/{prefix}/lib/{pymod_lib_dir}:$PYTHONPATH to make PsiAPI easy, that inserts starting in pos’n 1 (0-indexed), so `''` still at the head of `sys.path`. Now, if you try to run a psiapi/python file from `{top-level-psi4-dir}` that contains `import psi4`, it will find the source tree `psi4/__init__.py` and fail because there’s no `core.so` around. That is, it’s finding what looks to be the psi4 module dir structure `.` when the one it wants is what you inserted into PYTHONPATH at pos’n 1.

The way around this is to move the python file you’re running to any other directory. Or, within the file, do `sys.path.insert(0, {objdir}/stage/{prefix}/lib/{pymod_lib_dir}`.

## How to find tests without output.ref

Ideally, each new test or much-altered test should add its own `output.ref`. When that doesn’t happen, this command helps.

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    find tests/ -mindepth 1 -maxdepth 1 -type d '!' -exec test -e "{}/output.ref" ";" -print