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| {{Construction}} | | {{Moved To Community}} |
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| == Purpose of this document ==
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| This document describes the recommended coding style for kdepim. Nobody is
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| forced to use this style, but to have consistent formatting of the source code
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| files it is strongly recommended to make use of it.
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| ''In short: Kdepim coding style follows the''
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| [http://techbase.kde.org/Policies/Kdelibs_Coding_Style Kdelibs coding style].
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| == The rules for Kdepim ==
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| *don't use any <TAB>s
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| *Trim the lines
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| *Only single empty lines should be used
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| *The first line, the last line(s) may not be empty
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| *Use one space after each keyword, but not after a cast
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| *no "one line" if-statement
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| == Migration ==
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| As discussed at the KDEPIM meeting, Berlin, 3 March 2013, all the files of KDEPIM will
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| be reviewed to follow the coding style. This will be done over a long time,
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| directory after directory, for each of the
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| rules defined above. For each rule, one can find one or two script(s).
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| == Check the objects ==
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| As a first approach, not any object may have binary change after applying one of the rules.
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| To check this, one uses the '''Check-the-Objects.sh'''. Download the script: [[Media:Check-the-Objects.sh.gz]]
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| The script can be used with one of the commands:
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| * save
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| * test
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| * clean
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| '''An example:'''
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| {{Input|1=cd <some_kdepim_directory>
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| mkdir build
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| cd build
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| ccmake ../
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| make}}
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| {{Output|1=<span style="color:Fuchsia">Scanning dependencies of target gpgmepp</span>
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| [ 0%] <span style="color:green">Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/gpgmepp_automoc.cpp.o</span>
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| [ 0%] <span style="color:green">Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/exception.cpp.o</span>
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| [ 0%] <span style="color:green">Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/context.cpp.o</span>
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| ...}}
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| {{Input|1=Check-the-Objects.sh save}}
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| The script makes a copy of all the objects and a "time stamp":
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| {{Output|1=save the object ./kholidays/tests/CMakeFiles/testzodiac.dir/testzodiac.cpp.o
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| save the object ./kholidays/tests/CMakeFiles/testzodiac.dir/testzodiac_automoc.cpp.o
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| ...
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| all objects are saved}}
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| Now, one makes somes change(s) on the source(s) and:
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| {{Input| 1=make}}
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| Depending on the Makefile, some objects will be compiled again:
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| {{Output| 1=<span style="color:Fuchsia">Scanning dependencies of target akonadi-kde</span>
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| [ 17%] <span style="color:green">Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/entitytreeview.cpp.o</span>
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| [ 17%] <span style="color:green">Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/itemfetchjob.cpp.o</span>
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| [ 17%] <span style="color:green">Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/statisticsproxymodel.cpp.o</span>
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| ...
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| <span style="color:Fuchsia">Scanning dependencies of target akonadi-kmime</span>
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| [ 56%] <span style="color:green">Building CXX object akonadi/kmime/CMakeFiles/akonadi-kmime.dir/standardmailactionmanager.cpp.o</span>}}
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| {{Input|1=Check-the-Objects.sh test}}
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| The script finds all the new objects, makes a comparision with the saved version:
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| {{Output|1=test the object ./akonadi/CMakeFiles/akonadi-kde.dir/statisticsproxymodel.cpp.o
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| test the object ./akonadi/CMakeFiles/akonadi-kde.dir/entitytreeview.cpp.o
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| test the object ./akonadi/CMakeFiles/akonadi-kde.dir/itemfetchjob.cpp.o
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| test the object ./akonadi/kmime/CMakeFiles/akonadi-kmime.dir/standardmailactionmanager.cpp.o
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| all tests are OK
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| }}
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| == Check the assembler files ==
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| If we add or remove some lines, the debug informations included in the object file will be change also.
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| This is the case with the test/change of "''Only single empty lines should be used''", "''First line, last line(s) may not be empty''" and some more test/change below (''adding some blocks'' with { and }).
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| For this reason it is no more possible to compare the objects.
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| We have to compare the assembler files.
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| This works pretty well for the version with '''CMAKE_BUILD_TYPE''' set to ''release''.
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| For the version with '''CMAKE_BUILD_TYPE''' set to ''debug'', we must remove all the debug informations before the comparision could take place.
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| === Generate the assembler files ===
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| To generate the assembler files, we only need to modify the ''build.make'' in every folder. | |
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| The script '''Prepare-build_make_files.sh''' works on the all directory, finds the line with the compiler command,
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| duplicates the line, add a ''-S option'' and changes the name of the output to ''somename.s''.
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| After a new ''make'' command, we can save all the assembler files with the script '''Check-the-assembler_code.sh'''.
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| Download the script: [[Media:Prepare-build_make_files.sh.gz]]
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| === Remove the debug informations ===
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| The biggest part of the debug informations beginns with the directive line
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| *.Ldebug_info0
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| We drop all the next lines.
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| We drop also the lines with the directive .loc
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| They contain an information about the source line (here 123) we need later to drop the lines
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| * movl $123, %edx
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| * movl $123, %ecx
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| The lines with
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| * .string "/home/guy-kde/projects/kdepimlibs/akonadi/agentbase.cpp:454"
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| will be also removed.
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| The script to check the assembler files can be used in the same way as the one above (Check-the-Objects.sh).
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| To check this, one uses the '''Check-the-assembler_code.sh'''. Download the script: [[Media:Check-the-assembler_code.sh.gz]]
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| The script can be used with one of the commands:
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| * save
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| * test
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| * clean
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| == The scripts ==
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| The first script is '''to check''' a single file or a complete directory for all .h and
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| .cpp files.
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| If present, the second script '''makes the changes''' for a single file or a complete
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| directory for all .h and .cpp files. For some complicated situations, the
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| script makes no change.
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| One can use the scripts for own work.It is recommanded to use them in this order.
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| ==== don't use any <TAB>s ====
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| *coding-style-check-Tabs.sh
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| *coding-style-change-Tabs.sh
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| Download the scripts: [[Media:Tabs.tar.gz]]
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| The output of the '''check''' script is:
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| {{Output|1=check the file /home/guy-kde/projects/kdepimlibs/ktnef/ktnefparser.cpp
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| 1->308: Tab at 16: stream_ >> i; // i <- attribute type & name
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| 2->311: Tab at 16: stream_ >> i; // i <- data length
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| 3->326: Tab at 22: case attATTACHMENT: // try to get attachment info
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| 4->367: Tab at 16: stream_ >> u; // u <- checksum
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| a b c d}}
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|
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| This shows:
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| * the name of the file which is under test.
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| * the number of occurence('''a'''), the line number('''b'''), the position found('''c''') and the line itself('''d''').
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| The '''change''' script:
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| *makes a substitution of any <TAB> with eight spaces,
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| *The change works for the complete source, even within comments and strings,
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| *That might be too much and changes the vertical alignment of the code.
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| ==== Trim the lines ====
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| *coding-style-check-Trim.sh
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| *coding-style-change-Trim.sh
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| Download the scripts: [[Media:Trim.tar.gz]]
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| The output of the '''check''' script is:
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| {{Output|1=check the file /home/guy-kde/Software/coding-style-check/trim.cpp
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| 1->51: Space(s) at end of line (28): QVariant m_matchData;}}
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|
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| This shows:
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| * the name of the file which is under test.
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| * the number of occurence, the line number, the position found and the line itself.
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| The '''change''' script:
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| *remove all trailing space(s).
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| ==== Only single empty lines should be used ====
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| Refer to http://techbase.kde.org/Policies/Kdelibs_Coding_Style#Whitespace
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| *coding-style-check-Twice.sh
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| *coding-style-change-Twice.sh
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| The output of the '''check''' script is:
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| {{Output|1=check the file /home/guy-kde/projects/kdepimlibs/syndication/rss2/enclosure.cpp
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| 1->25: next empty line found
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| 2->26: next empty line found
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| 3->30: next empty line found}}
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|
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| This shows:
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| * the name of the file which is under test.
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| * the number of occurrences and the line numbers.
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| The '''change''' script:
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| *removes all the next empty line(s).
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| ==== First line, last line(s) may not be empty ====
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| Some of the sources have a first empty lines, some have one or more empty last line(s).
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| *coding-style-check-First-Last.sh
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| *coding-style-change-First-Last.sh
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| The output of the '''check''' script is:
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| {{Output|1=check the file /home/guy-kde/Software/coding-style-check/trim.cpp
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| The first line is empty
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| The last line is empty}}
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|
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| The '''change''' script:
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| *removes the first line if empty, all the last empty line(s).
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| ==== Use one space after each keyword, but not after a cast ====
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| Refer to http://techbase.kde.org/Policies/Kdelibs_Coding_Style#Whitespace
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| For most of the keywords, it is not necessary to make a test. Because the sources have been already compiled. For example this code never appear in a source:
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| {{Output|1=inta;
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| floatb;}}
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| Some of the keywords are alone in the statement, such as '''break''' and '''continue'''. No test is necessary.
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| The only tests we have to do are the ones where a keyword is (or can be) followed
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| by a sign '''( { [ :'''
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| These are:
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| '''alignas decltype alignof noexcept typeid asm static_assert switch if catch while for sizeof new
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| do try enum union
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| try'''
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| For only '''one''' keyword:
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| *coding-style-check-SpaceAfterKeyword.sh
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| *coding-style-change-SpaceAfterKeyword.sh
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| For '''all''' keywords above:
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| *coding-style-check-SpaceAfter.sh
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| *coding-style-change-SpaceAfter.sh
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| The output of the '''check''' script is:
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| {{Output|1=check the file /home/guy-kde/projects/kdepimlibs/akonadi/contact/contactstreemodel.cpp
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| 1->98: if( at 10: if( contact.realName().isEmpty() ) {
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| 2->99: if( at 12: if( contact.preferredEmail().isEmpty() ) {
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| }}
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| The '''change''' script:
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| *puts a space after the keyword.
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| ====no "one line" if-statement====
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| Refer to http://techbase.kde.org/Policies/Kdelibs_Coding_Style#Braces
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| The following code:
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| {{Output|1=if ( a > b ) c = 123;}}
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| is correct, but we prefer the block:
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| {{Output|1=if ( a > b ) {
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| c = 123;
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| } }}
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| which is easier to read, to modify.
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| It is also possible to put a breakpoint at the line in the block.
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| As the awk-script is too simple to recognize all the if-statements, we get some false alarm and
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| we can't make the changes automatically.
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| *coding-style-check-One-Line-If.sh
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| The output of the '''check''' script is:
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| {{Output|1=check the file /home/guy-kde/Software/coding-style-check/if-example.cpp
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| 1->25: one-line-if found}}
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| ====#include directive====
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| Refer to http://techbase.kde.org/Policies/Kdelibs_Coding_Style#Qt_Includes
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| We prefer no space at the beginning of the directive.
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| // wrong
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| # include <A/b>
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| // correct
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| #include <A/b>
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