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1 | Mercurial can be augmented with Rust extensions for speeding up certain | |||
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2 | operations. | |||
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3 | ||||
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4 | Compatibility | |||
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5 | ============= | |||
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6 | ||||
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7 | Though the Rust extensions are only tested by the project under Linux, users of | |||
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8 | MacOS, FreeBSD and other UNIX-likes have been using the Rust extensions. Your | |||
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9 | mileage may vary, but by all means do give us feedback or signal your interest | |||
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10 | for better support. | |||
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11 | ||||
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12 | No Rust extensions are available for Windows at this time. | |||
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13 | ||||
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14 | Features | |||
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15 | ======== | |||
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16 | ||||
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17 | The following operations are sped up when using Rust: | |||
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18 | - discovery of differences between repositories (pull/push) | |||
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19 | - nodemap (see :hg:`help config.format.use-persistent-nodemap`) | |||
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20 | - all commands using the dirstate (status, commit, diff, add, update, etc.) | |||
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21 | - dirstate-v2 (see :hg:`help config.format.exp-rc-dirstate-v2`) | |||
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22 | - iteration over ancestors in a graph | |||
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23 | ||||
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24 | More features are in the works, and improvements on the above listed are still | |||
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25 | in progress. For more experimental work see the "rhg" section. | |||
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26 | ||||
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27 | Checking for Rust | |||
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28 | ================= | |||
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29 | ||||
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30 | You may already have the Rust extensions depending on how you install Mercurial. | |||
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31 | ||||
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32 | $ hg debuginstall | grep -i rust | |||
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33 | checking Rust extensions (installed) | |||
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34 | checking module policy (rust+c-allow) | |||
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35 | ||||
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36 | If those lines don't even exist, you're using an old version of `hg` which does | |||
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37 | not have any Rust extensions yet. | |||
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38 | ||||
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39 | Installing | |||
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40 | ========== | |||
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41 | ||||
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42 | You will need `cargo` to be in your `$PATH`. See the "MSRV" section for which | |||
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43 | version to use. | |||
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44 | ||||
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45 | Using pip | |||
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46 | --------- | |||
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47 | ||||
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48 | Users of `pip` can install the Rust extensions with the following command: | |||
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49 | ||||
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50 | $ pip install mercurial --global-option --rust --no-use-pep517 | |||
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51 | ||||
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52 | `--no-use-pep517` is here to tell `pip` to preserve backwards compatibility with | |||
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53 | the legacy `setup.py` system. Mercurial has not yet migrated its complex setup | |||
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54 | to the new system, so we still need this to add compiled extensions. | |||
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55 | ||||
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56 | This might take a couple of minutes because you're compiling everything. | |||
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57 | ||||
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58 | See the "Checking for Rust" section to see if the install succeeded. | |||
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59 | ||||
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60 | From your distribution | |||
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61 | ---------------------- | |||
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62 | ||||
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63 | Some distributions are shipping Mercurial with Rust extensions enabled and | |||
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64 | pre-compiled (meaning you won't have to install `cargo`), or allow you to | |||
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65 | specify an install flag. Check with your specific distribution for how to do | |||
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66 | that, or ask their team to add support for hg+Rust! | |||
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67 | ||||
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68 | From source | |||
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69 | ----------- | |||
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70 | ||||
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71 | Please refer to the `rust/README.rst` file in the Mercurial repository for | |||
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72 | instructions on how to install from source. | |||
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73 | ||||
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74 | MSRV | |||
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75 | ==== | |||
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76 | ||||
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77 | The minimum supported Rust version is currently 1.48.0. The project's policy is | |||
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78 | to follow the version from Debian stable, to make the distributions' job easier. | |||
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79 | ||||
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80 | rhg | |||
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81 | === | |||
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82 | ||||
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83 | There exists an experimental pure-Rust version of Mercurial called `rhg` with a | |||
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84 | fallback mechanism for unsupported invocations. It allows for much faster | |||
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85 | execution of certain commands while adding no discernable overhead for the rest. | |||
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86 | ||||
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87 | The only way of trying it out is by building it from source. Please refer to | |||
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88 | `rust/README.rst` in the Mercurial repository. | |||
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89 | ||||
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90 | Contributing | |||
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91 | ============ | |||
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92 | ||||
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93 | If you would like to help the Rust endeavor, please refer to `rust/README.rst` | |||
|
94 | in the Mercurial repository. |
@@ -220,3 +220,4 b' 750920b18aaaddd654756be40dec59d90f2643be' | |||||
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@@ -233,3 +233,4 b' 750920b18aaaddd654756be40dec59d90f2643be' | |||||
233 | 6ee0244fc1cf889ae543d2ce0ec45201ae0be6e1 5.9.3 |
|
233 | 6ee0244fc1cf889ae543d2ce0ec45201ae0be6e1 5.9.3 | |
234 | a44bb185f6bdbecc754996d8386722e2f0123b0a 6.0rc0 |
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234 | a44bb185f6bdbecc754996d8386722e2f0123b0a 6.0rc0 | |
235 | 5d08b289e2e526259d7d5ea32b70fe76d5b327d7 6.0 |
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235 | 5d08b289e2e526259d7d5ea32b70fe76d5b327d7 6.0 | |
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236 | 799fdf4cca80cb9ae40537a90995e6bd163ebc0b 6.0.1 |
@@ -484,6 +484,15 b' helptable = sorted(' | |||||
484 | TOPIC_CATEGORY_IDS, |
|
484 | TOPIC_CATEGORY_IDS, | |
485 | ), |
|
485 | ), | |
486 | ( |
|
486 | ( | |
|
487 | [ | |||
|
488 | b'rust', | |||
|
489 | b'rustext', | |||
|
490 | ], | |||
|
491 | _(b'Rust in Mercurial'), | |||
|
492 | loaddoc(b'rust'), | |||
|
493 | TOPIC_CATEGORY_CONFIG, | |||
|
494 | ), | |||
|
495 | ( | |||
487 | [b'filesets', b'fileset'], |
|
496 | [b'filesets', b'fileset'], | |
488 | _(b"Specifying File Sets"), |
|
497 | _(b"Specifying File Sets"), | |
489 | loaddoc(b'filesets'), |
|
498 | loaddoc(b'filesets'), |
@@ -915,29 +915,60 b' https://www.mercurial-scm.org/wiki/Missi' | |||||
915 |
|
915 | |||
916 | Enabled by default. |
|
916 | Enabled by default. | |
917 |
|
917 | |||
|
918 | ``exp-rc-dirstate-v2`` | |||
|
919 | Enable or disable the experimental "dirstate-v2" feature. The dirstate | |||
|
920 | functionality is shared by all commands interacting with the working copy. | |||
|
921 | The new version is more robust, faster and stores more information. | |||
|
922 | ||||
|
923 | The performance-improving version of this feature is currently only | |||
|
924 | implemented in Rust (see :hg:`help rust`), so people not using a version of | |||
|
925 | Mercurial compiled with the Rust parts might actually suffer some slowdown. | |||
|
926 | For this reason, such versions will by default refuse to access repositories | |||
|
927 | with "dirstate-v2" enabled. | |||
|
928 | ||||
|
929 | This behavior can be adjusted via configuration: check | |||
|
930 | :hg:`help config.storage.dirstate-v2.slow-path` for details. | |||
|
931 | ||||
|
932 | Repositories with this on-disk format require Mercurial 6.0 or above. | |||
|
933 | ||||
|
934 | By default this format variant is disabled if the fast implementation is not | |||
|
935 | available, and enabled by default if the fast implementation is available. | |||
|
936 | ||||
|
937 | To accomodate installations of Mercurial without the fast implementation, | |||
|
938 | you can downgrade your repository. To do so run the following command: | |||
|
939 | ||||
|
940 | $ hg debugupgraderepo \ | |||
|
941 | --run \ | |||
|
942 | --config format.exp-rc-dirstate-v2=False \ | |||
|
943 | --config storage.dirstate-v2.slow-path=allow | |||
|
944 | ||||
|
945 | For a more comprehensive guide, see :hg:`help internals.dirstate-v2`. | |||
|
946 | ||||
918 | ``use-persistent-nodemap`` |
|
947 | ``use-persistent-nodemap`` | |
919 | Enable or disable the "persistent-nodemap" feature which improves |
|
948 | Enable or disable the "persistent-nodemap" feature which improves | |
920 |
performance if the |
|
949 | performance if the Rust extensions are available. | |
921 |
|
950 | |||
922 |
The "persisten |
|
951 | The "persistent-nodemap" persist the "node -> rev" on disk removing the | |
923 | need to dynamically build that mapping for each Mercurial invocation. This |
|
952 | need to dynamically build that mapping for each Mercurial invocation. This | |
924 | significantly reduce the startup cost of various local and server-side |
|
953 | significantly reduces the startup cost of various local and server-side | |
925 |
operation for larger repositor |
|
954 | operation for larger repositories. | |
926 |
|
955 | |||
927 |
The performance |
|
956 | The performance-improving version of this feature is currently only | |
928 |
implemented in Rust, so people not using a version of |
|
957 | implemented in Rust (see :hg:`help rust`), so people not using a version of | |
929 |
with the Rust part |
|
958 | Mercurial compiled with the Rust parts might actually suffer some slowdown. | |
930 |
|
|
959 | For this reason, such versions will by default refuse to access repositories | |
931 | behavior can be controlled by configuration. Check |
|
960 | with "persistent-nodemap". | |
|
961 | ||||
|
962 | This behavior can be adjusted via configuration: check | |||
932 | :hg:`help config.storage.revlog.persistent-nodemap.slow-path` for details. |
|
963 | :hg:`help config.storage.revlog.persistent-nodemap.slow-path` for details. | |
933 |
|
964 | |||
934 |
Repositor |
|
965 | Repositories with this on-disk format require Mercurial 5.4 or above. | |
935 |
|
966 | |||
936 | By default this format variant is disabled if fast implementation is not |
|
967 | By default this format variant is disabled if the fast implementation is not | |
937 | available and enabled by default if the fast implementation is available. |
|
968 | available, and enabled by default if the fast implementation is available. | |
938 |
|
969 | |||
939 |
To accomodate install of Mercurial without the fast implementation |
|
970 | To accomodate installations of Mercurial without the fast implementation, | |
940 | downgrade your repository. To do so run the following command: |
|
971 | you can downgrade your repository. To do so run the following command: | |
941 |
|
972 | |||
942 | $ hg debugupgraderepo \ |
|
973 | $ hg debugupgraderepo \ | |
943 | --run \ |
|
974 | --run \ |
@@ -6,15 +6,18 b' This directory contains various Rust cod' | |||||
6 | Rust is not required to use (or build) Mercurial, but using it |
|
6 | Rust is not required to use (or build) Mercurial, but using it | |
7 | improves performance in some areas. |
|
7 | improves performance in some areas. | |
8 |
|
8 | |||
9 |
There are currently |
|
9 | There are currently four independent Rust projects: | |
10 |
- chg. An implementation of chg, in |
|
10 | - chg. An implementation of chg, in Rust instead of C. | |
11 | - hgcli. A project that provide a (mostly) self-contained "hg" binary, |
|
11 | - hgcli. A project that provides a (mostly) self-contained "hg" binary, | |
12 | for ease of deployment and a bit of speed, using PyOxidizer. See |
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12 | for ease of deployment and a bit of speed, using PyOxidizer. See | |
13 | hgcli/README.md. |
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13 | hgcli/README.md. | |
14 | - hg-core (and hg-cpython): implementation of some |
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14 | - hg-core (and hg-cpython): implementation of some | |
15 |
functionality of mercurial in |
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15 | functionality of mercurial in Rust, e.g. ancestry computations in | |
16 | revision graphs, status or pull discovery. The top-level ``Cargo.toml`` file |
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16 | revision graphs, status or pull discovery. The top-level ``Cargo.toml`` file | |
17 | defines a workspace containing these crates. |
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17 | defines a workspace containing these crates. | |
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18 | - rhg: a pure Rust implementation of Mercurial, with a fallback mechanism for | |||
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19 | unsupported invocations. It reuses the logic `hg-core` but completely forgoes | |||
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20 | interaction with Python. See `rust/rhg/README.md` for more details. | |||
18 |
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21 | |||
19 | Using Rust code |
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22 | Using Rust code | |
20 | =============== |
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23 | =============== |
@@ -414,6 +414,7 b' Testing -h/--help:' | |||||
414 | hgweb Configuring hgweb |
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414 | hgweb Configuring hgweb | |
415 | merge-tools Merge Tools |
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415 | merge-tools Merge Tools | |
416 | pager Pager Support |
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416 | pager Pager Support | |
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417 | rust Rust in Mercurial | |||
417 |
|
418 | |||
418 | Concepts: |
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419 | Concepts: | |
419 |
|
420 | |||
@@ -548,6 +549,7 b' Testing -h/--help:' | |||||
548 | hgweb Configuring hgweb |
|
549 | hgweb Configuring hgweb | |
549 | merge-tools Merge Tools |
|
550 | merge-tools Merge Tools | |
550 | pager Pager Support |
|
551 | pager Pager Support | |
|
552 | rust Rust in Mercurial | |||
551 |
|
553 | |||
552 | Concepts: |
|
554 | Concepts: | |
553 |
|
555 |
@@ -113,6 +113,7 b' Test hiding some commands (which also ha' | |||||
113 | hgweb Configuring hgweb |
|
113 | hgweb Configuring hgweb | |
114 | merge-tools Merge Tools |
|
114 | merge-tools Merge Tools | |
115 | pager Pager Support |
|
115 | pager Pager Support | |
|
116 | rust Rust in Mercurial | |||
116 |
|
117 | |||
117 | Concepts: |
|
118 | Concepts: | |
118 |
|
119 | |||
@@ -251,6 +252,7 b' Test hiding some topics.' | |||||
251 | hgweb Configuring hgweb |
|
252 | hgweb Configuring hgweb | |
252 | merge-tools Merge Tools |
|
253 | merge-tools Merge Tools | |
253 | pager Pager Support |
|
254 | pager Pager Support | |
|
255 | rust Rust in Mercurial | |||
254 |
|
256 | |||
255 | Concepts: |
|
257 | Concepts: | |
256 |
|
258 |
@@ -165,6 +165,7 b' the extension is unknown.' | |||||
165 | hgweb Configuring hgweb |
|
165 | hgweb Configuring hgweb | |
166 | merge-tools Merge Tools |
|
166 | merge-tools Merge Tools | |
167 | pager Pager Support |
|
167 | pager Pager Support | |
|
168 | rust Rust in Mercurial | |||
168 |
|
169 | |||
169 | Concepts: |
|
170 | Concepts: | |
170 |
|
171 | |||
@@ -295,6 +296,7 b' the extension is unknown.' | |||||
295 | hgweb Configuring hgweb |
|
296 | hgweb Configuring hgweb | |
296 | merge-tools Merge Tools |
|
297 | merge-tools Merge Tools | |
297 | pager Pager Support |
|
298 | pager Pager Support | |
|
299 | rust Rust in Mercurial | |||
298 |
|
300 | |||
299 | Concepts: |
|
301 | Concepts: | |
300 |
|
302 | |||
@@ -1595,6 +1597,8 b' Separate sections from subsections' | |||||
1595 |
|
1597 | |||
1596 | "usefncache" |
|
1598 | "usefncache" | |
1597 |
|
1599 | |||
|
1600 | "exp-rc-dirstate-v2" | |||
|
1601 | ||||
1598 | "use-persistent-nodemap" |
|
1602 | "use-persistent-nodemap" | |
1599 |
|
1603 | |||
1600 | "use-share-safe" |
|
1604 | "use-share-safe" | |
@@ -2425,6 +2429,13 b' Dish up an empty repo; serve it cold.' | |||||
2425 | Specifying Revisions |
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2429 | Specifying Revisions | |
2426 | </td></tr> |
|
2430 | </td></tr> | |
2427 | <tr><td> |
|
2431 | <tr><td> | |
|
2432 | <a href="/help/rust"> | |||
|
2433 | rust | |||
|
2434 | </a> | |||
|
2435 | </td><td> | |||
|
2436 | Rust in Mercurial | |||
|
2437 | </td></tr> | |||
|
2438 | <tr><td> | |||
2428 | <a href="/help/scripting"> |
|
2439 | <a href="/help/scripting"> | |
2429 | scripting |
|
2440 | scripting | |
2430 | </a> |
|
2441 | </a> |
@@ -2324,6 +2324,10 b' help/ shows help topics' | |||||
2324 | "topic": "revisions" |
|
2324 | "topic": "revisions" | |
2325 | }, |
|
2325 | }, | |
2326 | { |
|
2326 | { | |
|
2327 | "summary": "Rust in Mercurial", | |||
|
2328 | "topic": "rust" | |||
|
2329 | }, | |||
|
2330 | { | |||
2327 | "summary": "Using Mercurial from scripts and automation", |
|
2331 | "summary": "Using Mercurial from scripts and automation", | |
2328 | "topic": "scripting" |
|
2332 | "topic": "scripting" | |
2329 | }, |
|
2333 | }, |
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