Difference between revisions of "Policies/Kdepim Coding Style"

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files it is strongly recommended to make use of it.
 
files it is strongly recommended to make use of it.
  
{{Remember|1=In short: Kdepim coding style follows the
+
''In short: Kdepim coding style follows the''
[http://techbase.kde.org/Policies/Kdelibs_Coding_Style Kdelibs coding style].}}
+
[http://techbase.kde.org/Policies/Kdelibs_Coding_Style Kdelibs coding style].
  
 
== The rules for Kdepim ==
 
== The rules for Kdepim ==
  
 
*don't use any <TAB>s
 
*don't use any <TAB>s
*The change script makes a substitution of any <TAB> with eight spaces.
 
*The change works for the complete source, even within comments and strings.
 
*That might be too much and change the vertical alignment of the code.
 
 
*Trim the lines
 
*Trim the lines
*Only single empty lines should be used.
+
*Only single empty lines should be used
 +
*The first line, the last line(s) may not be empty
  
 
== Migration ==
 
== Migration ==
Line 26: Line 24:
 
rules defined above.  For each rule, one can find one or two script(s).   
 
rules defined above.  For each rule, one can find one or two script(s).   
  
The first script is to check a single file or a complete directory for all .h and
+
== Check the objects ==
 +
 
 +
As a first approach, not any object may have binary change after applying one of the rules.
 +
To check this, one uses the '''Check-the-Objects.sh'''. Download the script: [[Media:Check-the-Objects.sh.gz]]
 +
 
 +
The script can be used with one of the commands:
 +
* save
 +
* test
 +
* clean
 +
 
 +
'''An example:'''
 +
 
 +
{{Input|1=cd <some_kdepim_directory>
 +
mkdir build
 +
cd build
 +
ccmake ../
 +
make}}
 +
{{Output|1=<span style="color:Fuchsia">Scanning dependencies of target gpgmepp</span>
 +
[  0%] <span style="color:green">Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/gpgmepp_automoc.cpp.o</span>
 +
[  0%] <span style="color:green">Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/exception.cpp.o</span>
 +
[  0%] <span style="color:green">Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/context.cpp.o</span>
 +
...}}
 +
 
 +
{{Input|1=Check-the-Objects.sh save}}
 +
The script makes a copy of all the objects and a "time stamp":
 +
{{Output|1=save the object ./kholidays/tests/CMakeFiles/testzodiac.dir/testzodiac.cpp.o
 +
save the object ./kholidays/tests/CMakeFiles/testzodiac.dir/testzodiac_automoc.cpp.o
 +
...
 +
all objects are saved}}
 +
 
 +
Now, one makes somes change(s) on the source(s) and:
 +
 
 +
{{Input| 1=make}}
 +
 
 +
Depending on the Makefile, some objects will be compiled again:
 +
 
 +
{{Output| 1=<span style="color:Fuchsia">Scanning dependencies of target akonadi-kde</span>
 +
[ 17%] <span style="color:green">Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/entitytreeview.cpp.o</span>
 +
[ 17%] <span style="color:green">Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/itemfetchjob.cpp.o</span>
 +
[ 17%] <span style="color:green">Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/statisticsproxymodel.cpp.o</span>
 +
...
 +
<span style="color:Fuchsia">Scanning dependencies of target akonadi-kmime</span>
 +
[ 56%] <span style="color:green">Building CXX object akonadi/kmime/CMakeFiles/akonadi-kmime.dir/standardmailactionmanager.cpp.o</span>}}
 +
 
 +
{{Input|1=Check-the-Objects.sh test}}
 +
 
 +
The script finds all the new objects, makes a comparision with the saved version:
 +
{{Output|1=test the object ./akonadi/CMakeFiles/akonadi-kde.dir/statisticsproxymodel.cpp.o
 +
test the object ./akonadi/CMakeFiles/akonadi-kde.dir/entitytreeview.cpp.o
 +
test the object ./akonadi/CMakeFiles/akonadi-kde.dir/itemfetchjob.cpp.o
 +
test the object ./akonadi/kmime/CMakeFiles/akonadi-kmime.dir/standardmailactionmanager.cpp.o
 +
all tests are OK
 +
}}
 +
 
 +
== Check the assembler files ==
 +
If we add or remove some lines, the debug informations included in the object file will be change also.
 +
 
 +
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 }).
 +
 
 +
For this reason it is no more possible to compare the objects.
 +
We have to compare the assembler files.
 +
This works pretty well for the version with '''CMAKE_BUILD_TYPE''' set to ''release''.
 +
For the version with '''CMAKE_BUILD_TYPE''' set to ''debug'', we must remove all the debug informations before the comparision could take place.
 +
 
 +
=== Generate the assembler files ===
 +
 
 +
To generate the assembler files, we only need to modify the ''build.make'' in every folder.
 +
 
 +
The script '''Prepare-build_make_files.sh''' works on the all directory, finds the line with the compiler command,
 +
duplicates the line, add a ''-S option'' and changes the name of the output to ''somename.s''.
 +
After a new ''make'' command, we can save all the assembler files with the script '''Check-the-assembler_code.sh'''.
 +
Download the script: [[Media:Prepare-build_make_files.sh.gz]]
 +
 
 +
=== Remove the debug informations ===
 +
 
 +
The biggest part of the debug informations beginns with the directive line
 +
*.Ldebug_info0
 +
We drop all the next lines.
 +
 
 +
We drop also the lines with the directive .loc
 +
They contain an information about the source line (here 123) we need later to drop the lines
 +
* movl $123, %edx
 +
* movl $123, %ecx
 +
 
 +
The lines with
 +
* .string "/home/guy-kde/projects/kdepimlibs/akonadi/agentbase.cpp:454"
 +
will be also removed.
 +
 
 +
The script to check the assembler files can be used in the same way as the one above (Check-the-Objects.sh).
 +
To check this, one uses the '''Check-the-assembler_code.sh'''. Download the script: [[Media:Check-the-assembler_code.sh.gz]]
 +
 
 +
The script can be used with one of the commands:
 +
* save
 +
* test
 +
* clean
 +
 
 +
== The scripts ==
 +
The first script is '''to check''' a single file or a complete directory for all .h and
 
.cpp files.
 
.cpp files.
  
If present, the second script makes the changes for a single file or a complete
+
If present, the second script '''makes the changes''' for a single file or a complete
 
directory for all .h and .cpp files.  For some complicated situations, the
 
directory for all .h and .cpp files.  For some complicated situations, the
 
script makes no change.
 
script makes no change.
  
 
One can use the scripts for own work.It is recommanded to use them in this order.
 
One can use the scripts for own work.It is recommanded to use them in this order.
=== The scripts ===
 
  
 
==== don't use any <TAB>s ====
 
==== don't use any <TAB>s ====
 
*coding-style-check-Tabs.sh
 
*coding-style-check-Tabs.sh
 
*coding-style-change-Tabs.sh
 
*coding-style-change-Tabs.sh
The output of the check is:
+
 
 +
Download the scripts: [[Media:Tabs.tar.gz]]
 +
 
 +
The output of the '''check''' script is:
 
  {{Output|1=check the file /home/guy-kde/projects/kdepimlibs/ktnef/ktnefparser.cpp
 
  {{Output|1=check the file /home/guy-kde/projects/kdepimlibs/ktnef/ktnefparser.cpp
 
1->308: Tab at 16:  stream_ >> i;              // i <- attribute type & name
 
1->308: Tab at 16:  stream_ >> i;              // i <- attribute type & name
Line 45: Line 142:
 
3->326: Tab at 22:  case attATTACHMENT:        // try to get attachment info
 
3->326: Tab at 22:  case attATTACHMENT:        // try to get attachment info
 
4->367: Tab at 16:  stream_ >> u;      // u <- checksum
 
4->367: Tab at 16:  stream_ >> u;      // u <- checksum
a  b    c             d}}
+
a  b    c           d}}
 
    
 
    
 
This shows:
 
This shows:
Line 51: Line 148:
 
* the number of occurence('''a'''), the line number('''b'''), the position found('''c''') and the line itself('''d''').
 
* the number of occurence('''a'''), the line number('''b'''), the position found('''c''') and the line itself('''d''').
  
 
+
The '''change''' script:
The change script makes a substitution of any <TAB> with eight spaces.
+
*makes a substitution of any <TAB> with eight spaces,
The change works for the complete source, even within comments and strings.
+
*The change works for the complete source, even within comments and strings,
That might be too much and change the vertical alignment of the code.
+
*That might be too much and changes the vertical alignment of the code.
  
 
==== Trim the lines ====
 
==== Trim the lines ====
  
 
*coding-style-check-Trim.sh
 
*coding-style-check-Trim.sh
*coding-style-change-Trim.sh}}
+
*coding-style-change-Trim.sh
  
=== Check for multiple empty lines ===
+
Download the scripts: [[Media:Trim.tar.gz]]
  
{{Input|1=
+
The output of the '''check''' script is:
    coding-style-check-Twice.sh
+
{{Output|1=check the file /home/guy-kde/Software/coding-style-check/trim.cpp
    coding-style-change-Twice.sh}}
+
1->51: Space(s) at end of line (28):  QVariant m_matchData;}}
 +
 
 +
This shows:
 +
* the name of the file which is under test.
 +
* the number of occurence, the line number, the position found and the line itself.
  
The output of the check is:
+
 
{{Output|1=
+
The '''change''' script:
    /home/guy-kde/projects/kdepimlibs/syndication/rss2/enclosure.cpp
+
*remove all trailing space(s).
    1->25: next empty line found
+
 
    2->26: next empty line found
+
==== Only single empty lines should be used ====
    3->30: next empty line found}}
+
 
 +
*coding-style-check-Twice.sh
 +
*coding-style-change-Twice.sh
 +
 
 +
The output of the '''check''' script is:
 +
{{Output|1=check the file /home/guy-kde/projects/kdepimlibs/syndication/rss2/enclosure.cpp
 +
1->25: next empty line found
 +
2->26: next empty line found
 +
3->30: next empty line found}}
 
      
 
      
 
This shows:
 
This shows:
 
* the name of the file which is under test.
 
* the name of the file which is under test.
 
* the number of occurrences and the line numbers.
 
* the number of occurrences and the line numbers.
 +
 +
The '''change''' script:
 +
*removes all the next empty line(s).
 +
 +
==== First line, last line(s) may not be empty ====
 +
 +
Some of the sources have a first empty lines, some have one or more empty last line(s).
 +
*coding-style-check-First-Last.sh
 +
*coding-style-change-First-Last.sh
 +
 +
The output of the '''check''' script is:
 +
{{Output|1=check the file /home/guy-kde/Software/coding-style-check/trim.cpp
 +
The first line is empty
 +
The last line is empty}}
 +
   
 +
The '''change''' script:
 +
*removes the first line if empty, all the last empty line(s).

Revision as of 16:38, 3 April 2013

Under construction.png
 
Under Construction
This is a new page, currently under construction!


Contents

Purpose of this document

This document describes the recommended coding style for kdepim. Nobody is forced to use this style, but to have consistent formatting of the source code files it is strongly recommended to make use of it.

In short: Kdepim coding style follows the Kdelibs coding style.

The rules for Kdepim

  • don't use any <TAB>s
  • Trim the lines
  • Only single empty lines should be used
  • The first line, the last line(s) may not be empty

Migration

As discussed at the KDEPIM meeting, Berlin, 3 March 2013, all the files of KDEPIM will be reviewed to follow the coding style. This will be done over a long time, directory after directory, for each of the rules defined above. For each rule, one can find one or two script(s).

Check the objects

As a first approach, not any object may have binary change after applying one of the rules. To check this, one uses the Check-the-Objects.sh. Download the script: Media:Check-the-Objects.sh.gz

The script can be used with one of the commands:

  • save
  • test
  • clean

An example:

cd <some_kdepim_directory>
mkdir build
cd build
ccmake ../
make
Scanning dependencies of target gpgmepp
[  0%] Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/gpgmepp_automoc.cpp.o
[  0%] Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/exception.cpp.o
[  0%] Building CXX object gpgme++/CMakeFiles/gpgmepp.dir/context.cpp.o
...
Check-the-Objects.sh save

The script makes a copy of all the objects and a "time stamp":

save the object ./kholidays/tests/CMakeFiles/testzodiac.dir/testzodiac.cpp.o
save the object ./kholidays/tests/CMakeFiles/testzodiac.dir/testzodiac_automoc.cpp.o
...
all objects are saved

Now, one makes somes change(s) on the source(s) and:

make

Depending on the Makefile, some objects will be compiled again:

Scanning dependencies of target akonadi-kde
[ 17%] Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/entitytreeview.cpp.o
[ 17%] Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/itemfetchjob.cpp.o
[ 17%] Building CXX object akonadi/CMakeFiles/akonadi-kde.dir/statisticsproxymodel.cpp.o
...
Scanning dependencies of target akonadi-kmime
[ 56%] Building CXX object akonadi/kmime/CMakeFiles/akonadi-kmime.dir/standardmailactionmanager.cpp.o
Check-the-Objects.sh test

The script finds all the new objects, makes a comparision with the saved version:

test the object ./akonadi/CMakeFiles/akonadi-kde.dir/statisticsproxymodel.cpp.o
test the object ./akonadi/CMakeFiles/akonadi-kde.dir/entitytreeview.cpp.o
test the object ./akonadi/CMakeFiles/akonadi-kde.dir/itemfetchjob.cpp.o
test the object ./akonadi/kmime/CMakeFiles/akonadi-kmime.dir/standardmailactionmanager.cpp.o
all tests are OK

Check the assembler files

If we add or remove some lines, the debug informations included in the object file will be change also.

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 }).

For this reason it is no more possible to compare the objects. We have to compare the assembler files. This works pretty well for the version with CMAKE_BUILD_TYPE set to release. For the version with CMAKE_BUILD_TYPE set to debug, we must remove all the debug informations before the comparision could take place.

Generate the assembler files

To generate the assembler files, we only need to modify the build.make in every folder.

The script Prepare-build_make_files.sh works on the all directory, finds the line with the compiler command, duplicates the line, add a -S option and changes the name of the output to somename.s. After a new make command, we can save all the assembler files with the script Check-the-assembler_code.sh. Download the script: Media:Prepare-build_make_files.sh.gz

Remove the debug informations

The biggest part of the debug informations beginns with the directive line

  • .Ldebug_info0

We drop all the next lines.

We drop also the lines with the directive .loc They contain an information about the source line (here 123) we need later to drop the lines

  • movl $123, %edx
  • movl $123, %ecx

The lines with

  • .string "/home/guy-kde/projects/kdepimlibs/akonadi/agentbase.cpp:454"

will be also removed.

The script to check the assembler files can be used in the same way as the one above (Check-the-Objects.sh). To check this, one uses the Check-the-assembler_code.sh. Download the script: Media:Check-the-assembler_code.sh.gz

The script can be used with one of the commands:

  • save
  • test
  • clean

The scripts

The first script is to check a single file or a complete directory for all .h and .cpp files.

If present, the second script makes the changes for a single file or a complete directory for all .h and .cpp files. For some complicated situations, the script makes no change.

One can use the scripts for own work.It is recommanded to use them in this order.

don't use any <TAB>s

  • coding-style-check-Tabs.sh
  • coding-style-change-Tabs.sh

Download the scripts: Media:Tabs.tar.gz

The output of the check script is:

check the file /home/guy-kde/projects/kdepimlibs/ktnef/ktnefparser.cpp
1->308: Tab at 16:   stream_ >> i;              // i <- attribute type & name
2->311: Tab at 16:   stream_ >> i;              // i <- data length
3->326: Tab at 22:   case attATTACHMENT:        // try to get attachment info
4->367: Tab at 16:   stream_ >> u;      // u <- checksum
a  b    c            d

This shows:

  • the name of the file which is under test.
  • the number of occurence(a), the line number(b), the position found(c) and the line itself(d).

The change script:

  • makes a substitution of any <TAB> with eight spaces,
  • The change works for the complete source, even within comments and strings,
  • That might be too much and changes the vertical alignment of the code.

Trim the lines

  • coding-style-check-Trim.sh
  • coding-style-change-Trim.sh

Download the scripts: Media:Trim.tar.gz

The output of the check script is:

check the file /home/guy-kde/Software/coding-style-check/trim.cpp
1->51: Space(s) at end of line (28):   QVariant m_matchData;

This shows:

  • the name of the file which is under test.
  • the number of occurence, the line number, the position found and the line itself.


The change script:

  • remove all trailing space(s).

Only single empty lines should be used

  • coding-style-check-Twice.sh
  • coding-style-change-Twice.sh

The output of the check script is:

check the file /home/guy-kde/projects/kdepimlibs/syndication/rss2/enclosure.cpp
1->25: next empty line found
2->26: next empty line found
3->30: next empty line found

This shows:

  • the name of the file which is under test.
  • the number of occurrences and the line numbers.

The change script:

  • removes all the next empty line(s).

First line, last line(s) may not be empty

Some of the sources have a first empty lines, some have one or more empty last line(s).

  • coding-style-check-First-Last.sh
  • coding-style-change-First-Last.sh

The output of the check script is:

check the file /home/guy-kde/Software/coding-style-check/trim.cpp
The first line is empty
The last line is empty

The change script:

  • removes the first line if empty, all the last empty line(s).

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