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annotate mercurial/help/merge-tools.txt @ 20971:557a083453c9
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author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Fri, 11 Apr 2014 13:43:41 -0400 |
parents | f1a3ae7c15df |
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12771 | 1 To merge files Mercurial uses merge tools. |
2 | |
3 A merge tool combines two different versions of a file into a merged | |
4 file. Merge tools are given the two files and the greatest common | |
5 ancestor of the two file versions, so they can determine the changes | |
6 made on both branches. | |
7 | |
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8 Merge tools are used both for :hg:`resolve`, :hg:`merge`, :hg:`update`, |
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9 :hg:`backout` and in several extensions. |
12771 | 10 |
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11 Usually, the merge tool tries to automatically reconcile the files by |
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12 combining all non-overlapping changes that occurred separately in |
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13 the two different evolutions of the same initial base file. Furthermore, some |
12771 | 14 interactive merge programs make it easier to manually resolve |
15 conflicting merges, either in a graphical way, or by inserting some | |
16 conflict markers. Mercurial does not include any interactive merge | |
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17 programs but relies on external tools for that. |
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18 |
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19 Available merge tools |
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20 ===================== |
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21 |
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22 External merge tools and their properties are configured in the |
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23 merge-tools configuration section - see hgrc(5) - but they can often just |
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24 be named by their executable. |
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25 |
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26 A merge tool is generally usable if its executable can be found on the |
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27 system and if it can handle the merge. The executable is found if it |
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28 is an absolute or relative executable path or the name of an |
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29 application in the executable search path. The tool is assumed to be |
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30 able to handle the merge if it can handle symlinks if the file is a |
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31 symlink, if it can handle binary files if the file is binary, and if a |
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32 GUI is available if the tool requires a GUI. |
12771 | 33 |
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34 There are some internal merge tools which can be used. The internal |
12771 | 35 merge tools are: |
36 | |
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37 .. internaltoolsmarker |
12771 | 38 |
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39 Internal tools are always available and do not require a GUI but will by default |
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40 not handle symlinks or binary files. |
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41 |
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42 Choosing a merge tool |
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43 ===================== |
12771 | 44 |
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45 Mercurial uses these rules when deciding which merge tool to use: |
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46 |
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47 1. If a tool has been specified with the --tool option to merge or resolve, it |
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48 is used. If it is the name of a tool in the merge-tools configuration, its |
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49 configuration is used. Otherwise the specified tool must be executable by |
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50 the shell. |
12771 | 51 |
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52 2. If the ``HGMERGE`` environment variable is present, its value is used and |
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53 must be executable by the shell. |
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54 |
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55 3. If the filename of the file to be merged matches any of the patterns in the |
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56 merge-patterns configuration section, the first usable merge tool |
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57 corresponding to a matching pattern is used. Here, binary capabilities of the |
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58 merge tool are not considered. |
12771 | 59 |
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60 4. If ui.merge is set it will be considered next. If the value is not the name |
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61 of a configured tool, the specified value is used and must be executable by |
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62 the shell. Otherwise the named tool is used if it is usable. |
12771 | 63 |
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64 5. If any usable merge tools are present in the merge-tools configuration |
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65 section, the one with the highest priority is used. |
12771 | 66 |
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67 6. If a program named ``hgmerge`` can be found on the system, it is used - but |
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68 it will by default not be used for symlinks and binary files. |
12771 | 69 |
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70 7. If the file to be merged is not binary and is not a symlink, then |
12771 | 71 ``internal:merge`` is used. |
72 | |
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73 8. The merge of the file fails and must be resolved before commit. |
12771 | 74 |
75 .. note:: | |
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12771 | 77 After selecting a merge program, Mercurial will by default attempt |
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78 to merge the files using a simple merge algorithm first. Only if it doesn't |
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79 succeed because of conflicting changes Mercurial will actually execute the |
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80 merge program. Whether to use the simple merge algorithm first can be |
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81 controlled by the premerge setting of the merge tool. Premerge is enabled by |
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82 default unless the file is binary or a symlink. |
12771 | 83 |
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84 See the merge-tools and ui sections of hgrc(5) for details on the |
12771 | 85 configuration of merge tools. |