Mercurial: Difference between revisions

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(Add some tips for working with TortoiseHg)
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[https://www.mercurial-scm.org Mercurial] (sometimes referred to as {{codeline|hg}}) is the source code management system used for Octave development.
[https://www.mercurial-scm.org Mercurial] (sometimes referred to as {{codeline|hg}}) is the source code management system used for Octave development.


Everybody is free to '''run, copy, distribute, study, change and improve'''<ref>https://www.gnu.org/philosophy/free-sw.en.html</ref> Octave's source code, given in the main repository at https://www.octave.org/hg/octave.  Use Mercurial to get the latest version of Octave <pre>hg clone https://www.octave.org/hg/octave</pre>
Everybody is free to '''run, copy, distribute, study, change and improve'''<ref>https://www.gnu.org/philosophy/free-sw.en.html</ref> Octave's source code, given in the main repository at https://www.octave.org/hg/octave.  Use Mercurial to get the latest version of Octave <pre>hg clone https://hg.octave.org/octave</pre>


{{Note|[https://tortoisehg.bitbucket.io/ TortoiseHg] is a GUI for Mercurial and it is especially recommended for users doing their first steps with source code management systems.  Linux, macOS, and MS Windows are supported.}}
{{Note|[https://tortoisehg.bitbucket.io/ TortoiseHg] is a GUI for Mercurial and it is especially recommended for users doing their first steps with source code management systems.  Linux, macOS, and MS Windows are supported.}}
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If you want to share your modifications, for example to fix a nasty '''bug #42424''', you cannot just submit your changes to Octave's main repository.  You have to generate a '''patch (or changeset)''' so other Octave developers can include them into Octave's source code.
If you want to share your modifications, for example to fix a nasty '''bug #42424''', you cannot just submit your changes to Octave's main repository.  You have to generate a '''patch (or changeset)''' so other Octave developers can include them into Octave's source code.


# Get the latest version of Octave (or some Octave package) <pre>hg clone https://www.octave.org/hg/octave</pre> or when already cloned <pre>hg pull && hg update</pre>
# Get the latest version of Octave (or some Octave package) <pre>hg clone https://hg.octave.org/octave</pre> or when already cloned <pre>hg pull && hg update</pre>
# Make your changes (fix bug #42424) and save them.  '''Make sure that your changes don't introduce new bugs!'''  Thus it is recommended to [[Building | build Octave]] and to [[Tests | run Octave's test suite]] before proceeding.<br>{{Warning|Please follow the [[Contribution guidelines]] for C/C++ or Octave code files!}}
# Make your changes (fix bug #42424) and save them.  '''Make sure that your changes don't introduce new bugs!'''  Thus it is recommended to [[Building | build Octave]] and to [[Tests | run Octave's test suite]] before proceeding.<br>{{Warning|Please follow the [[Contribution guidelines]] for C/C++ or Octave code files!}}
# Commit your changes <pre>hg commit</pre> Mercurial will open your default editor<ref>To set your default Mercurial editor, read https://www.mercurial-scm.org/wiki/editor .</ref> and ask you for a commit message.  Please follow the [[commit message guidelines]], e.g. <syntaxhighlight lang="text">help.m: Display relevant topics first (bug #42424)
# Commit your changes <pre>hg commit</pre> Mercurial will open your default editor<ref>To set your default Mercurial editor, read https://www.mercurial-scm.org/wiki/editor .</ref> and ask you for a commit message.  Please follow the [[commit message guidelines]], e.g. <syntaxhighlight lang="text">help.m: Display relevant topics first (bug #42424)
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=== Activate the "mq" extension ===
=== Activate the "mq" extension ===


The "mq" extensions allow to modify (local) changeset after they have been committed. They also allow to rebase changes to a new parent or to strip changes completely.
The "mq" extension allows to modify (local) changesets after they have been committed. It also allows to rebase changes to a new parent or to strip changes completely.
The "mq" extensions do *not* allow to modify pushed changes.
The "mq" extension does *not* allow to modify pushed changes.


To activate the "mq" extensions in TortoiseSVN, open the settings, select "Extensions" on the global settings tab and activate the checkbox next to "mq".
To activate the "mq" extension in TortoiseSVN, open the settings, select "Extensions" on the global settings tab and activate the checkbox next to "mq".
 
The most useful feature of that extension is probably to update an existing changeset. For this, select "Modify History" -> "Import to MQ" in the right click menu of the respective changeset. After updating some local files or changing the commit message, hit the "QRefresh" button. Finish the patch by selecting "Modify History" -> "Finish Patch" from the right click menu of the respective changeset.


=== Rebase a change to a current tip ===
=== Rebase a change to a current tip ===


Sometime a change of the upstream repository might make it necessary to rebase a changeset to a new parent. There are several ways to achieve this. The ways described here might not be the most elegant ones. Any editor is welcome to add onto this.
Sometimes a change in the upstream repository might make it necessary to rebase a changeset to a new parent. There are several ways to achieve this. The ways described here might not be the most elegant ones. Any editor is welcome to add onto this.


Strip and commit:
Strip and commit:
# Pull changes from the upstream repository.
# Pull changes from the upstream repository.
# Before updating to the new tip, strip the local changes by selecting "Modify History" -> "Strip..." from the right click menu. In the dialog select, "Do not modify working copy during strip (-k/--keep)".
# Before updating to the new tip, strip the local changes by selecting "Modify History" -> "Strip..." from the right click menu. In the dialog, select "Do not modify working copy during strip (-k/--keep)".
# Update to the new tip (maybe in incremental steps).
# Update to the new tip (maybe in incremental steps).
# Commit the local changes in a "fresh" changeset. This has the drawback that any commit message might be lost. But it often works even if other approaches fail.
# Commit the local changes in a "fresh" changeset. This has the drawback that any commit message might be lost. But it often works even if other approaches fail.
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