find . -name *.java -exec grep -v -P \
"^[\s]*(\*|//|/\*|import|$)" \
'{}' ';' | wc -l
But what does it?
- First if finds all java files an print them to the standard output.
- Then it removes empty, import and comment lines.
- Finally it count the lines.
After a while, I though that perl could be used to discard comments more accurately. So I produced this command line replacing grep by perl:
find . -name "*.java" -exec perl -n -e \
'$i=1 if(/^\s*\/\*/);print $_ if(!$i && !/^\s*(\/\/|import|$)/);$i=0 if($i && /\*\//)' \
'{}' ';' | wc -l
Finally someone pointed to me to check sloccount, a command-line tool able not only to count lines but also to estimate the effort and the cost in dollars. Take a look to the results of the gwtupload library:
$ sloccount gwtupload-project [...] SLOC Directory SLOC-by-Language (Sorted) 4346 samples-gae java=3966,xml=380 3048 core java=2956,xml=92 1360 jsupload java=608,perl=551,xml=201 704 gae java=614,xml=81,sh=9 615 samples java=403,xml=212 569 tomcat xml=569 512 top_dir xml=482,sh=30 Totals grouped by language (dominant language first): java: 8547 (76.63%) xml: 2017 (18.08%) perl: 551 (4.94%) sh: 39 (0.35%) Total Physical Source Lines of Code (SLOC) = 11,154 Development Effort Estimate, Person-Years (Person-Months) = 2.52 (30.20) (Basic COCOMO model, Person-Months = 2.4 * (KSLOC**1.05)) Schedule Estimate, Years (Months) = 0.76 (9.13) (Basic COCOMO model, Months = 2.5 * (person-months**0.38)) Estimated Average Number of Developers (Effort/Schedule) = 3.31 Total Estimated Cost to Develop = $ 339,973 (average salary = $56,286/year, overhead = 2.40). [...] Please credit this data as "generated using David A. Wheeler's 'SLOCCount'."
