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help: fix typo in merge-tools topic
Wagner Bruna -
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1 To merge files Mercurial uses merge tools.
1 To merge files Mercurial uses merge tools.
2
2
3 A merge tool combines two different versions of a file into a merged
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
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
5 ancestor of the two file versions, so they can determine the changes
6 made on both branches.
6 made on both branches.
7
7
8 Merge tools are used both for :hg:`resolve`, :hg:`merge`, :hg:`update`,
8 Merge tools are used both for :hg:`resolve`, :hg:`merge`, :hg:`update`,
9 :hg:`backout` and in several extensions.
9 :hg:`backout` and in several extensions.
10
10
11 Usually, the merge tool tries to automatically reconcile the files by
11 Usually, the merge tool tries to automatically reconcile the files by
12 combining all non-overlapping changes that occurred separately in
12 combining all non-overlapping changes that occurred separately in
13 the two different evolutions of the same initial base file. Furthermore, some
13 the two different evolutions of the same initial base file. Furthermore, some
14 interactive merge programs make it easier to manually resolve
14 interactive merge programs make it easier to manually resolve
15 conflicting merges, either in a graphical way, or by inserting some
15 conflicting merges, either in a graphical way, or by inserting some
16 conflict markers. Mercurial does not include any interactive merge
16 conflict markers. Mercurial does not include any interactive merge
17 programs but relies on external tools for that.
17 programs but relies on external tools for that.
18
18
19 Available merge tools
19 Available merge tools
20 """""""""""""""""""""
20 """""""""""""""""""""
21
21
22 External merge tools and their properties are configured in the
22 External merge tools and their properties are configured in the
23 merge-tools configuration section - see hgrc(5) - but they can often just
23 merge-tools configuration section - see hgrc(5) - but they can often just
24 be named by their executable.
24 be named by their executable.
25
25
26 A merge tool is generally usable if its executable can be found on the
26 A merge tool is generally usable if its executable can be found on the
27 system and if it can handle the merge. The executable is found if it
27 system and if it can handle the merge. The executable is found if it
28 is an absolute or relative executable path or the name of an
28 is an absolute or relative executable path or the name of an
29 application in the executable search path. The tool is assumed to be
29 application in the executable search path. The tool is assumed to be
30 able to handle the merge if it can handle symlinks if the file is a
30 able to handle the merge if it can handle symlinks if the file is a
31 symlink, if it can handle binary files if the file is binary, and if a
31 symlink, if it can handle binary files if the file is binary, and if a
32 GUI is available if the tool requires a GUI.
32 GUI is available if the tool requires a GUI.
33
33
34 There are a some internal merge tools which can be used. The internal
34 There are some internal merge tools which can be used. The internal
35 merge tools are:
35 merge tools are:
36
36
37 ``internal:merge``
37 ``internal:merge``
38 Uses the internal non-interactive simple merge algorithm for merging
38 Uses the internal non-interactive simple merge algorithm for merging
39 files. It will fail if there are any conflicts and leave markers in
39 files. It will fail if there are any conflicts and leave markers in
40 the partially merged file.
40 the partially merged file.
41
41
42 ``internal:fail``
42 ``internal:fail``
43 Rather than attempting to merge files that were modified on both
43 Rather than attempting to merge files that were modified on both
44 branches, it marks them as unresolved. The resolve command must be
44 branches, it marks them as unresolved. The resolve command must be
45 used to resolve these conflicts.
45 used to resolve these conflicts.
46
46
47 ``internal:local``
47 ``internal:local``
48 Uses the local version of files as the merged version.
48 Uses the local version of files as the merged version.
49
49
50 ``internal:other``
50 ``internal:other``
51 Uses the other version of files as the merged version.
51 Uses the other version of files as the merged version.
52
52
53 ``internal:prompt``
53 ``internal:prompt``
54 Asks the user which of the local or the other version to keep as
54 Asks the user which of the local or the other version to keep as
55 the merged version.
55 the merged version.
56
56
57 ``internal:dump``
57 ``internal:dump``
58 Creates three versions of the files to merge, containing the
58 Creates three versions of the files to merge, containing the
59 contents of local, other and base. These files can then be used to
59 contents of local, other and base. These files can then be used to
60 perform a merge manually. If the file to be merged is named
60 perform a merge manually. If the file to be merged is named
61 ``a.txt``, these files will accordingly be named ``a.txt.local``,
61 ``a.txt``, these files will accordingly be named ``a.txt.local``,
62 ``a.txt.other`` and ``a.txt.base`` and they will be placed in the
62 ``a.txt.other`` and ``a.txt.base`` and they will be placed in the
63 same directory as ``a.txt``.
63 same directory as ``a.txt``.
64
64
65 Internal tools are always available and do not require a GUI but will by default
65 Internal tools are always available and do not require a GUI but will by default
66 not handle symlinks or binary files.
66 not handle symlinks or binary files.
67
67
68 Choosing a merge tool
68 Choosing a merge tool
69 """""""""""""""""""""
69 """""""""""""""""""""
70
70
71 Mercurial uses these rules when deciding which merge tool to use:
71 Mercurial uses these rules when deciding which merge tool to use:
72
72
73 1. If a tool has been specified with the --tool option to merge or resolve, it
73 1. If a tool has been specified with the --tool option to merge or resolve, it
74 is used. If it is the name of a tool in the merge-tools configuration, its
74 is used. If it is the name of a tool in the merge-tools configuration, its
75 configuration is used. Otherwise the specified tool must be executable by
75 configuration is used. Otherwise the specified tool must be executable by
76 the shell.
76 the shell.
77
77
78 2. If the ``HGMERGE`` environment variable is present, its value is used and
78 2. If the ``HGMERGE`` environment variable is present, its value is used and
79 must be executable by the shell.
79 must be executable by the shell.
80
80
81 3. If the filename of the file to be merged matches any of the patterns in the
81 3. If the filename of the file to be merged matches any of the patterns in the
82 merge-patterns configuration section, the first usable merge tool
82 merge-patterns configuration section, the first usable merge tool
83 corresponding to a matching pattern is used. Here, binary capabilities of the
83 corresponding to a matching pattern is used. Here, binary capabilities of the
84 merge tool are not considered.
84 merge tool are not considered.
85
85
86 4. If ui.merge is set it will be considered next. If the value is not the name
86 4. If ui.merge is set it will be considered next. If the value is not the name
87 of a configured tool, the specified value is used and must be executable by
87 of a configured tool, the specified value is used and must be executable by
88 the shell. Otherwise the named tool is used if it is usable.
88 the shell. Otherwise the named tool is used if it is usable.
89
89
90 5. If any usable merge tools are present in the merge-tools configuration
90 5. If any usable merge tools are present in the merge-tools configuration
91 section, the one with the highest priority is used.
91 section, the one with the highest priority is used.
92
92
93 6. If a program named ``hgmerge`` can be found on the system, it is used - but
93 6. If a program named ``hgmerge`` can be found on the system, it is used - but
94 it will by default not be used for symlinks and binary files.
94 it will by default not be used for symlinks and binary files.
95
95
96 7. If the file to be merged is not binary and is not a symlink, then
96 7. If the file to be merged is not binary and is not a symlink, then
97 ``internal:merge`` is used.
97 ``internal:merge`` is used.
98
98
99 8. The merge of the file fails and must be resolved before commit.
99 8. The merge of the file fails and must be resolved before commit.
100
100
101 .. note::
101 .. note::
102 After selecting a merge program, Mercurial will by default attempt
102 After selecting a merge program, Mercurial will by default attempt
103 to merge the files using a simple merge algorithm first. Only if it doesn't
103 to merge the files using a simple merge algorithm first. Only if it doesn't
104 succeed because of conflicting changes Mercurial will actually execute the
104 succeed because of conflicting changes Mercurial will actually execute the
105 merge program. Whether to use the simple merge algorithm first can be
105 merge program. Whether to use the simple merge algorithm first can be
106 controlled by the premerge setting of the merge tool. Premerge is enabled by
106 controlled by the premerge setting of the merge tool. Premerge is enabled by
107 default unless the file is binary or a symlink.
107 default unless the file is binary or a symlink.
108
108
109 See the merge-tools and ui sections of hgrc(5) for details on the
109 See the merge-tools and ui sections of hgrc(5) for details on the
110 configuration of merge tools.
110 configuration of merge tools.
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