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Cool Uses for Perl

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This section is the place to post your general code offerings.

CUFP's
Commodore disk image processor thingy
3 direct replies — Read more / Contribute
by rje
on Sep 01, 2014 at 19:57
    Dear Perlmonks,

    I wrote a Perl library, and I think it's pretty cool, but I'm also asking your opinions about it - is it worth putting on CPAN, for instance.

    It is a pure-Perl library for handing Commodore disk images. For those needing a refresher, these are digital images of diskettes and hard disks used by Commodore computers in the late 1970s thru the 1980s.

    It's hosted inside my network, behind my modem's firewall, by my Raspberry Pi running a cheapo web server I wrote (also in Perl) specifically for the purpose of serving and manipulating Commodore disk images.

    My library handles D64, D71, D81, D67, D80, D82, and X64 image types. Each format is a little package (about 8k) with data specific to that image. I made them packages, although I could have just used parametric data. These packages are essentially parametric data anyhow, and provide context to a generic engine that knows how Commodore disk images work.

    The library is 140k (includes good POD documentation, which is rare for me) split among about 20 files.

    First, is it worth posting to CPAN. It's awfully specialized. Maybe it would be better just to post it as a tarball on a website (or github?).

    Second, it's been nearly 10 years since I've uploaded to CPAN, and I am intimidated by the process. Yes, I've read the rules, but I'm concerned about uploading 20 related files in one batch. Anyone have any advice beyond what PAUSE has to say?

    Thanks for listening.

Duct taping spam-bot protection to a web forum
No replies — Read more | Post response
by aitap
on Aug 31, 2014 at 10:24

    There is a free web hosting which offers a third-level domain name and an installation of their proprietary CMS. It is somewhat widely known in the ex-USSR countries. They have "Web 2.0" AJAX interface, a lot of modules for nearly everything, from a simple forum to a web shop, and a primitive read-only API. I happen to be moderating one of such forums. Despite not being popular in terms of human population it has recently gained a lot of popularity among spam-sending robots.

    At first they all were making the same mistake of posting messages with titles equal to their nicknames, and so the first version of bothunter.pl was born. It employed link parsing routines of WWW::Mechanize and reproduced a sniffed AJAX request by some black magic of parsing JavaScript source for variables. Needless to say, soon it broke, both because JavaScript source slightly changed and because bots became slightly smarter, so the moderators went back to deleting bots manually.

    Yesterday I thought: with PhantomJS, I could mimic the browser and click all these AJAX buttons required to ban a user. As for the spam, maybe it's possible to count unique words in a message and warn if some of them is repeated a lot, and a list of stop-words could help, too... Before I started thinking of ways to automatically build a list of stop words from spam messages I realised that I was reiventing the wheel and searched for spam detection engines.

    My first try was Mail::SpamAssassin, because it's written in Perl and I heard a lot of stories about plugging it into other programs. It turned out to be not so easy to make it work with plain text (non-mail) messages, so I searched for alternatives. It is Mail::SpamAssassin, after all. Bogofilter is not written in Perl, but still was easy to plug in my program, thanks to its -T option, and it happily works with plain text without complaining.

    Interfacing with the site was not so easy. Banning a spam robot (click-click-tab-tab-"spam robot"-tab-space-tab-space) exploded into a mess of ->clicking xpath-found elements; at one time the site refused to register my click no matter how I tried, so I had to call the corresponding JS function manually; in the other place of program I find myself logged out, and the only way to get back in is to load the page I'm going to delete, load the login page, log in, then load the to-be-deleted page again. Kludges. Ew.

    So, here it is: the second version of bot hunter Perl program. I hope it won't break as fast as the first one. Or, at least, will be easier to fix.

LED blinking Morse code from Raspberry Pi
2 direct replies — Read more / Contribute
by rje
on Aug 30, 2014 at 11:23
    With the handy Device::BCM2835 package, I tossed together this little package so I could send "morse code" out on an LED I connected to GPIO Pins #5 and #7.

    (FYI: the Raspberry Pi can run a number of Linux systems, all with Perl. I wrote a tiny HTTP server on it which lets me create and serve Commodore disk images, also allowing me to extract and inject files, in Perl of course. It runs behind my firewall...)

'bld' project - signature(SHA1) based replacement for 'make'
4 direct replies — Read more / Contribute
by rahogaboom
on Aug 22, 2014 at 15:14
    'bld' is entirely in Perl. 'bld' is a replacement for the 'make' command. It is based on determi +ning out of dateness by signatures(SHA1) not dates. For a critique of 'make' and why you woul +d want to do this see: http://www.scons.org/wiki/FromMakeToScons. Installing 'bld' is very simple. Download bld-1.0.0.tar.xz from https +://github.com/rahogaboom/bld. Unpack wherever in your home directory and install the experimental.pm + Perl module. Make sure you have access to GNU 'cpp' and 'ldd'. To run the examples +(examples, git, svn, systemd) you'll need gcc(1)/g++(1) (http://gcc.gnu.org/) and clang(1) (http://l +lvm.org/). That's It! I used the git, svn and systemd projects as complex multi-target examp +les of how bld would be used to re-'make' these projects. They are well known and widely used. An +y other projects might do. Read the bld.README file. Do './bld -h'. Do 'perldoc bld'. Do './bld' to build the exec-c executable "Hello, world!" program. Th +is creates the bld.info, bld.warn and Bld.sig files which along with the Bld file + gives an illustration of how to construct Bld files and the output that bld + creates. The following is an abbreviated version of 'perldoc bld': NAME bld VERSION bld version 1.0.0 USAGE usage: bld [-h] -h - this message.(exit) ARGUMENTS None OPTIONS bld [-h] -h help message(exit) ENVIRONMENT VARIABLES None RC CONFIGURATION FILES None DEPENDENCIES Required for execution: experimental.pm(3pm) - for smartmatch and switch features cpp(1) - gnu cpp cmd is required for dependency determination ldd(1) - used for library dependency determination Required for test: gcc(1)/g++(1) (http://gcc.gnu.org/) clang(1) (http://llvm.org/) PROJECT STATE State: 1. The code is mostly done - unless someone finds a bug or sugges +ts an enhancement. 2. The in code documentation is done. 3. The testing is 80%-90% done. 4. The usage msg is done - the perldoc is 50%-60% done, needs a l +ot of work. Needed: 1. The code is in very good shape unless someone discovers a bug +or suggests an enhancement. My current focus is on the documentation and testing. 2. The git, svn and systemd projects need work. I ran ./configur +e before each bld. I used no options. How options affect the generated code and thus th +e Bld files is important. Anyone willing to investigate configure options and how these +options affect the Bld files is welcome. 3. The bld.<project>.install scripts all need to be done. I'd pr +efer to partner with someone knowledgeable about the installation of git, svn and systemd. 4. All the Bld.gv.<project> files should be vetted by a <project> + knowledgeable builder. 5. The git, svn and systemd projects will all be creating new ver +sions eventually. Anyone that would like to add bld.<project>/<version> and Bld.<projec +t>/<version> directories with the new versions is welcome. 6. I need someone with substantial experience building the linux +kernel to advise me or partner with me on the construction of 3.15 or later. 7. If you successfully bld a new project and wish to contribute t +he bld, please do so. I'm interested in how others construct/organize/document/debug pro +jects and their Bld files. DESCRIPTION bld(1.0.0) is a simple flexible non-hierarchical program that bui +lds a single C/C++/Objective C /Objective C++/Assembler target(executable or library(static or s +hared)) and, unlike 'make', uses SHA1 signatures(no dates) for building software and GNU cpp for automa +tic header file dependency checking. The operation of bld depends entirely on the construct +ion of the Bld(bld specification) and Bld.gv(bld global values) files. See the bld.README file. T +here are no cmd line arguments or options(except for -h(this msg)) or $HOME/.bldrc or ./.bldrc file +s and no environment variables are used. Complex multi-target projects are bld't with the use of a +Bld.<project> (Bld files and target bld output files) directory, bld.<project>(project source) + directory, bld.<project>(target construction) script, bld.<project>.rm(target and bld.<info|warn| +fatal>.<target> file removal) script, Bld.<project>.gv(project global values) file, bld.<projec +t>.install(target and file install) script and bld.<project>.README(project specific documen +tation) file. Current example projects: Bld.git - the git project http://git-scm.com/ Bld.svn - the subversion project http://subversion.apache.org +/ Bld.systemd - the systemd project http://www.freedesktop.org/ +wiki/Software/systemd/ Bld.example - misc examples intended to show how to create Bl +d and Bld.gv files bld is based upon taking the SHA1 signature of anything that, whe +n changed, would require a rebuild of the executable/library. It is not, like 'make', based + in any way on dates. This means that source or header files may be moved about, and if the +files do not change then nothing needs to, or will, be rebuilt. bld is not hierarchical; +all of the information to rebuild the executable is contained in the Bld(and Bld.gv) file. + The rebuild is based on Perl's regex engine to specify source file patterns along with the Perl +eval{} capability to bring variable definitions from the Bld file into the source. bld reads the Bld file which describes the build. This example B +ld file serves for the following discussion: Program description and Bld file explanatory comments go here. +(and are ignored by bld) EVAL DIRS The Bld file has three sections , a starting comment section to d +ocument the Bld, an EVAL and DIRS. Variables to be used for interpolation into build commands are de +fined in the EVAL section. The variables are all Perl variables. The entire EVAL section is + eval{}'ed in bld. Any errors will terminate the run. The DIRS section has three field( +: 0) lines which are the directory, the matched files to a Perl regular expression, an +d a build command for the line matched files. EVAL section variable definitions are interpolate +d into the build commands. bld will execute "$cmd $dir/$s"; for each source file, with $cmd +from the interpolated third field, $dir from the first field, and $s from the matched source +second field of the DIRS section lines. Rebuilds will happen only if: 1. a source file is new or has changed 2. the corresponding object file is missing or has changed 3. the command that is used to compile the source has changed 4. a dependent header file has changed 5. the command to link the executable or build the library arc +hive has changed 6. the executable or library has changed or is missing The Bld.sig file, automatically built, holds the source/object/he +ader/executable/library file names and the corresponding signatures used to determine if a sou +rce should be rebuilt the next time bld is run. Normally, system header files are included + in the rebuild criteria. However, with the -s switch, signature testing of these files can + be disabled to improve performance. It is unusual for system header files to change exc +ept after a new OS installation. add description of directory structure - o dir - build dir FEATURES AND ADVANTAGES 1. Everything is done with SHA1 signatures. No dates are used an +ywhere. 2. bld is REALLY simple to use. There are no arguments, no optio +ns(except -h), no environment variables and no rc files. The entire bld is controlled from the Bld(and Bl +d.gv file) file. Only a minimal knowledge of perl is needed - variable definitions and simple regular ex +pressions. 3. bld is not hierarchical. A single Bld file controls the const +ruction of a single target(a target is an executable or library(static or shared)). Complex multi-targe +t projects use one Bld.gv(global values) file and many Bld files - one to a target. 4. Each source file will have three signatures associated with it + - one for the source file, one for the corresponding object file and one for the cmds use to rebuild +the source. A change in any of these will result in a rebuild. 5. If any files in the bld have the same signature this is warned + about e.g. two header or source files of the same or different names. 6. Optionally, the signatures of dynamic libraries may be tracked +. If a library signature changes the bld may warn or stop the rebuild. If dynamic libraries are added or d +eleted from the bld this can ignore/warn/fatal. 7. A change in the target signature will result in a rebuild. 8. Complex multi-target projects are built with a standard direct +ory setup and a standard set of scripts - Directories: Bld.<project>/<version> - has all files controlling +<project> <version>s blds and bld target output files bld.<project>/<version> - source code for <project> +<version>s Files: bld.<project> - for initiating single targ +et, multi-target or all target blds of a <project> bld.<project>.rm - for initiating single targ +et, multi-target or all target clean of a <project> bld.<project>.targets - list of all <project> targ +ets bld.<project>.README - <project> README bld.<project>.install - <project> install script bld.<project>.script.<script> - scripts called by the Bld. +<project>.<target> files Bld.<project>.<target> - the Bld file for each <pro +ject> <target> Bld.gv.<project> - global values imported int +o all Bld.<project>.<target> files QUICK START 1. Bld'ing the systemd project - http://www.freedesktop.org/wiki/ +Software/systemd/ a. cd Bld.systemd/systemd-208 # puts you into the systemd(syst +emd-208) project directory b. ./bld.systemd --all # bld's all of the systemd targe +ts and bld target output files - the bld.info.systemd.<targ +et>, the bld.warn.systemd.<targ +et>, the bld.fatal.systemd.<tar +get>, files c. ./bld.systemd.rm --all # cleans up everything 2. Bld'ing the svn project - https://subversion.apache.org/ a. cd Bld.svn/subversion-1.8.5 # puts you into the svn(subvers +ion-1.8.5) project directory b. ./bld.svn --all # bld's all of the svn targets +and bld target output files - the bld.info.svn.<target> +, the bld.warn.svn.<target> +, the bld.fatal.svn.<target +>, files c. ./bld.svn.rm --all # cleans up everything 3. Bld'ing the git project - http://www.git-scm.com/ a. cd Bld.git/git-1.9.rc0 # puts you into the git(git-1.9.rc0) + project directory b. ./bld.git --all # bld's all of the git targets and b +ld target output files - the bld.info.git.<target>, the bld.warn.git.<target>, the bld.fatal.git.<target>, files c. ./bld.git.rm --all # cleans up everything 4. Bld'ing any single target a. cd bld # the main bld directory - cd here when you un +pack the bld.tar.xz file b. Install the source code in a sub-directory of the bld direc +tory c. Create a Bld file - the Bld file entirely controls the targ +et bld - see example below d. ./bld -h # the bld usage msg e. ./bld # do the bld f. ./bld.rm # clean up g. vi Bld.sig # examine the bld signature file h. vi bld.info # detailed info about the stages of the bld i. vi bld.warn # warning msgs from the bld j. vi bld.fatal # fatal msgs that terminated the bld - should +be empty if bld is successful FILES ~/bld directory files: bld - the bld perl script bld.rm - script to clean the bld directory bld.README - for first point of contact quick start Bld - the bld file which controls bld and the construction + of a target Bld.gv - the file of global values imported into the Bld file +(unusually used only for multi-target builds) Bld.sig - the signature(SHA1) file created from the Bld file bld.info - information about the bld bld.warn - warnings from the bld bld.fatal - the fatal msg that ended the bld ~/bld directories: Bld.<project>/<version> - has all files controlling <project> <ve +rsion>s blds and bld target output files bld.<project>/<version> - source code for <project> <version>s aux - template scripts for <project> blds ~/bld/aux files: aux/bld.<project> - template copied to Bld.<project>/<versi +on> directories to bld multi-target projects aux/bld.<project>.rm - template copied to Bld.<project>/<versi +on> directories to clean multi-target projects ~/bld/Bld.<project>/<version> files: bld.<project> - for initiating single target, mul +ti-target or all target blds of a <project> bld.<project>.rm - for initiating single target, mul +ti-target or all target clean of a <project> bld.<project>.targets - list of all <project> targets bld.<project>.README - <project> README bld.<project>.install - <project> install script bld.<project>.script.<script> - scripts called by the Bld.<projec +t>.<target> files Bld.<project>.<target> - the Bld file for each <project> < +target> Bld.gv.<project> - global values imported into all B +ld.<project>.<target> files Bld.sig.<project>.<target> - the signature(SHA1) file for each + <project> <target> bld.info.<project>.<target> - the bld.info file for each <proje +ct> <target> bld.warn.<project>.<target> - the bld.warn file for each <proje +ct> <target> bld.fatal.<project>.<target> - the bld.fatal file for each <proj +ect> <target> <target>s - all of the <project> targets PRIMARY PROGRAM DATA STRUCTURES TBD NOTES 1. bld assumes that a source will build a derived file e.g. .o fi +les in the same directory and have the same root name as the source. 2. bld assumes that all targets in multi-target bld's will be uni +quely named - all targets go into the same project directory. 3. Some projects violate either or both of these target naming or + object file naming/location requirements, but reconstructing these projects with bld shoul +d be relatively easy e.g. systemd. 4. bld executes cmd fields({}) in the bld directory and then move +s all created files to the source directory. Very old notes - needs updating: . . . Bld FILE FORMAT The Bld file(and Bld.gv) controls the entire target bld. It is d +ivided into three sections - Comment(s), EVAL and DIRS: Add comments before the EVAL line EVAL # mandatory defined variables $bld=""; $bldcmd = ""; $lib_dirs = ""; $opt_s = ""; $opt_r = ""; $opt_lib = ""; DIRS # {cmds} cmd blocks or dir:regex:{cmds} specifications {cmds} dir:regex:{cmds} dir:regex:{cmds} ... 1. a comment section 2. An EVAL(starts a line) section - this is perl code that is eva +l'ed in bld. Six variables are required. These are: e.g. EVAL # mandatory defined variables # the target to built e.g. executable, libx.a, libx.so $bld="exec-c"; # cmd used in perl system() call to build $bld target +- requires '$bld'(target) and '$O'(object files) internally $bldcmd = "$CC -lm -o \$bld \$O"; # space separated list of directories to search for li +braries $lib_dirs = "example/lib /usr/lib /lib /usr/local/lib" +; # use system header files in dependency checking("syst +em" or "nosystem") $opt_s = "system"; # inform about any files that will require rebuilding, + but do not rebuild("rebuild" or "norebuild") $opt_r = "rebuild"; # do dependency checking on libraries("libcheck", "nol +ibcheck", "warnlibcheck" or "fatallibcheck") $opt_lib = "fatallibcheck"; Any other simple perl variables can be defined in the EVAL + section and used in the DIRS section. Environment variables may be set. 3. A DIRS(starts a line) section - this section will have either +{cmds} cmd blocks or dir:regex:{cmds} specifications. The {cmds} blocks are just a group of shell cmds, always execu +ted. A dir specification is a source directory relative to the bld directory. The regex specification is a perl regul +ar expression that will pick up one or more of the source files in dir. The {cmds} specification describes how t +o build the selected source files. Any number of cmds, ';' separated, may be specified within the {} brackets. Example Bld Files: Simplest(Bld.example/example/Bld.example.helloworld-c): The 'Hello World!' program with only the minimal required +definitions. Comment(s) EVAL $CC = "gcc"; # mandatory defined variables # the target to built e.g. executable, libx.a, libx.so $bld="helloworld-c"; # cmd used in perl system() call to build $bld target +- requires '$bld'(target) and '$O'(object files) internally $bldcmd = "$CC -o \$bld \$O"; # space separated list of directories to search for li +braries $lib_dirs = "/usr/lib /lib /usr/local/lib"; # use system header files in dependency checking("syst +em" or "nosystem") $opt_s = "system"; # inform about any files that will require rebuilding, + but do not rebuild("rebuild" or "norebuild") $opt_r = "rebuild"; # do dependency checking on libraries("libcheck", "nol +ibcheck", "warnlibcheck" or "fatallibcheck") $opt_lib = "warnlibcheck"; DIRS bld.example/example : ^helloworld\.c$ : { $CC -c $s; } Complex(Bld.example/example/Bld.example.exec-c): A well commented example of all of the features of a Bld f +ile. The code routines are all just stubs designed to illustrate a Bld file. Comment(s) EVAL # this section will define perl variables to be interpolat +ed into DIRS section cmd fields # the compiler $CC = "clang"; # mandatory defined variables # the target to built e.g. executable, libx.a, libx.so $bld="exec-c"; # cmd used in perl system() call to build $bld target +- requires '$bld'(target) and '$O'(object files) internally $bldcmd = "$CC -lm -o \$bld \$O"; # space separated list of directories to search for li +braries $lib_dirs = "example/lib /usr/lib /lib /usr/local/lib" +; # use system header files in dependency checking("syst +em" or "nosystem") $opt_s = "system"; # inform about any files that will require rebuilding, + but do not rebuild("rebuild" or "norebuild") $opt_r = "rebuild"; # do dependency checking on libraries("libcheck", "nol +ibcheck", "warnlibcheck" or "fatallibcheck") $opt_lib = "fatallibcheck"; # some examples of variables that will be interpolated int +o DIRS section cmd fields $INCLUDE = "-I bld.example/example/include"; $LSOPTIONS = "-l"; # "a" or "b" to conditionally compile main.c $COND = "a"; DIRS # this section will have either {cmds} cmd blocks or dir:r +egex:{cmds} specifications # example of use of conditional compilation bld.example/example/C : ^main\.c$ : { # can have comments here too if [ "$COND" == 'a' ]; then $CC -S $INCLUDE $s; fi if [ "$COND" == 'b' ]; then $CC -O4 -S $INCLUDE $s; fi } # example of execution of a bare block of cmds - '{' and ' +}' may be on separate lines { ls $LSOPTIONS; } # the cmd field may be put on another line(s) and indented bld.example/example/C : ^g\.x\.C$ : { $CC -c $INCLUDE $s; } # all three fields - dir, regex and cmd - may be put on se +parate lines(even with extra blank lines). # directories may have embedded blanks('a b'). bld.example/example/C/a b : ^m\.c$ : {$CC -c $INCLUDE $s;} # example of regex field that captures multiple source fil +es(h.c and i.c) and example of a # cmd field with multiple cmds - white space is irrelevant +(a change should not cause a rebuild) # example of cmd fields with multiple cmds(ls and $CC) bld.example/example/C : ^(h|i)\.c$ : { ls -l $s; +$CC -c $INCLUDE $s; } # example of assembler source # Note: the $CC compile produces .o output by changing the + c to an o. # the as output needs to be specified by the -o opti +on. bld.example/example/C : ^main\.s$ : {as -c -o main.o $ +s;} bld.example/example/C/ww : ^u\.c$ : {$CC -c $INCLUDE $ +s;} # example of use of recursive directory search - the same +regex and cmd fields # are applied to all subdirectories of the specified dir f +ield(right after the 'R') R bld.example/example/C/y : ^.*\.c$ : {$CC -c $INCLUDE $ +s;} bld.example/example/C/x : ^t\.c$ : {$CC -c $INCLUDE $ +s;} bld.example/example/C/z : ^(w|w1)\.c$ : {$CC -c $INCL +UDE $s;} # cmd blocks may execute multiple cmds(ls and pwd) { ls -lfda; pwd; ls; } DIAGNOSTICS Warnings(Warning ID(WID)): # routine: rebuild_target_bool() # ldd return has a library 'not found' entry warning("WID 1: ldd return: $libname library is 'not found'"); . . . Fatals(Fatal ID(FID)): # routine: main bld program block # bad option entered - only '-h' allowed fatal("FID 1: GetOptions() failed(use bld -h)."); . . . TODO/CONTEMPLATE/INVESTIGATE/EXAMINE/CHECKOUT/THINK ABOUT/HACK ON ... INCOMPATIBILITIES None Known BUGS AND LIMITATIONS None Known SEE ALSO bld.README Critique of 'make': http://www.scons.org/wiki/FromMakeToScons CHANGES bld-1.0.0.tar.xz - initial release AUTHOR Richard A Hogaboom richard.hogaboom@gmail.com LICENSE and COPYRIGHT and (DISCLAIMER OF) WARRANTY Copyright (c) 1998-2014, Richard A Hogaboom All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions + are met: * Redistributions of source code must retain the above copyright n +otice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyrigh +t notice, this list of conditions and the following disclaimer in th +e documentation and/or other materials provided with the distributio +n. * Neither the name of the {organization} nor the names of its cont +ributors may be used to endorse or promote products derived from this softw +are without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTOR +S "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMI +TED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTIC +ULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECI +AL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO +, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEOR +Y OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDI +NG NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. :-)
DBIx::Class recursive subquery construct
No replies — Read more | Post response
by maruhige
on Aug 15, 2014 at 14:38

    Hello Monks,

    My first encounter with DBIx::Class's subquery construct went so well (and my need of n subqueries so great) that I tried a programmatic way of creating nested subqueries, shared here.

    Context is simply a tag search function, where all the tags are in one table, with an intermediate 2 integer column table to the post table. Tags are retrieved from the tag table in ascending order of weight to ensure the smallest possible start set, getting progressively smaller.

    sub recursive_subquery{ my($schema,$join_column,$key,$values) = @_; my ($value1) = shift(@$values); my $sub_query =$schema->search({ $key => $value1, }); for(@$values){ my $tmp_query = $schema->search({ $join_column => { -in => $sub_query->get_column($join_column)->as_query }, $key => $_, }); $sub_query = $tmp_query; } return $sub_query; }

    And a short example of using it manually in Catalyst:

    $c->stash->{rows} = $c->model('DB::Post')->search({ 'posts.post_id' => { -in => recursive_subquery( $c->model('DB::TagCloud1'), ,'post_id', 'tag_def_id',[ 16042, 190712, ])->get_column('post_id')->as_query }, });

    As an aside, the performance of this highlighted the unhappy fact that mysql tends to evaluate sub queries from the outside-in, so you may want to reverse the weighting in that setup.

Draw a Square With Perl!
4 direct replies — Read more / Contribute
by Dipseydoodle
on Aug 14, 2014 at 10:41

    Good morning monks. Today I figured I'd post this little script I wrote. It's not that cool and you can propbably point out errors in my writing/syntax style, so feel free to yell at me :)

    #!/usr/bin/perl # Put on your nerd glasses and draw a square! use strict; use warnings; my $balancex = 10; # width my $repeatx = $balancex; #don't change repeatx!!! use balancex instead +. my $repeaty = 10; # height do{ while($repeatx > 0){ print ". "; # change the period to print another character, but ke +ep the extra space. $repeatx -= 1; } print "\n"; $repeatx += $balancex; $repeaty -= 1; } until ($repeaty == 0); #corrected by Athanasius & AppleFritter

    No doubt this could be done in much fewer lines, or even as a one-liner :P But as it says it draws a square with periods, and is just fun to look at.

Check popular review sites for new reviews.
1 direct reply — Read more / Contribute
by wrinkles
on Jul 28, 2014 at 19:25

    This script checks select pages on some popular review sites for the latest review, and writes the date of the most recent review from each site to a file. Each time it is run, it checks against the previous results and sends an email notification with the date and link to page(s) with fresh reviews.

    "mailx" was used to send email. I suspect that this may not be available in Windows, I tested only on Mac OS X and Ubuntu.

    The following script has the pages hard-coded, as it was written for my school. Those pages (and your email addresses) could easily be replaced to suit your requirements.

    I found "The 10-minute XPath Tutorial" ("Automating System Administration with Perl, 2nd ed.) very helpful in understanding XPath. Thanks also to the help of fellow perl monks!

    By the way, "EB" and "MA" are shorthand for two separate campuses within our school.

    Update 2014-07-28 - I ran perlcritic and fixed some potential problems

    #!/usr/bin/env perl use strict; use warnings; use utf8; use Text::CSV; use Carp; use LWP::Simple qw(get); use Text::Unidecode qw(unidecode); use HTML::TreeBuilder::XPath; # Email Settings my %email = ( to => 'me@example.com,you@example.com', subject => 'New ECDS reviews found' ); # Reviews subroutine and URLs to check my $review_sites = [ { site => 'Yelp', sub => \&yelp_checker, review_pages => { 'EB' => 'http://www.yelp.com/biz/encinitas-country-day-school-encinitas?sort_b +y=date_desc', 'MA' => 'http://www.yelp.com/biz/encinitas-country-day-school-encinitas-2?sort +_by=date_desc' } }, { site => 'GreatSchools', sub => \&gs_checker, review_pages => { 'MA' => 'http://www.greatschools.org/california/encinitas/9670-Encinitas-Count +ry-Day-School/?tab=reviews' } }, { site => 'PrivateSchoolReview', sub => \&psr_checker, review_pages => { 'MA' => 'http://www.privateschoolreview.com/school_ov/school_id/ +2039' } }, { site => 'Kudzu', sub => \&kudzu_checker, review_pages => { 'MA' => 'http://www.kudzu.com/m/Encinitas-Country-Day-School-135 +71675' } }, { site => 'MerchantCircle', sub => \&mc_checker, review_pages => { 'MA' => 'http://www.merchantcircle.com/business/Encinitas.Country.Day.School.7 +60-942-1111?sort=created&dir=desc' } } ]; # Default date if no record my $default_date = '00-00-0000'; # Month name to number conversion my %month = ( January => '01', February => '02', March => '03', April => '04', May => '05', June => '06', July => '07', August => '08', September => '09', October => '10', November => '11', December => '12' ); # Where is the reviews file? my $reviews_filepath = "reviews.txt"; # Where is the alert message file? my $msg_filepath = "msg.txt"; # Slurp hash from reviews file my $old_reviews = hash_from_csv($reviews_filepath); my %new_reviews; # Iterate through each site for my $review_site (@$review_sites) { my $pages = $review_site->{review_pages}; # iterate through each campus html and collect xpath nodes while ( my ( $campus, $url ) = each %$pages ) { my $html = get $url or croak("Can't reach $url $!\n"); $html =~ s/([^[:ascii:]]+)/unidecode($1)/ge; my $tree = HTML::TreeBuilder::XPath->new; $tree->parse($html) or croak("Parse failed: $!\n"); my ($date) = $review_site->{'sub'}->($tree); # create hash keys from campus and review site names my $campus_site = $campus . '_' . $$review_site{'site'}; push( @{ $new_reviews{$campus_site} }, $date ); push( @{ $new_reviews{$campus_site} }, $url ); } } # Write message if new reviews my $msg = ''; while ( my ( $item, $data ) = each %new_reviews ) { unless ( $$old_reviews{$item}[0] eq $$data[0] ) { $msg .= "New review on $$data[0]: \n $$data[1]\n"; } } # Save message. open my $fh, ">:encoding(utf8)", "$msg_filepath" or croak("cannot open $msg_filepath: $!"); print {$fh} $msg or croak("Can't print message:\n$msg\n$!"); close $fh; # Write new review data to file. hash_to_csv( \%new_reviews, $reviews_filepath ); # Email message if exists send_email($msg) if length($msg); ######## SUBROUTINES ####### # import old data from file sub hash_from_csv { my $filepath = shift; open my $fh, "<:encoding(utf8)", "$filepath" or croak("cannot open $filepath: $!"); my $csv = Text::CSV->new( { binary => 1 } ); my %hash; map { $hash{ shift @{$_} } = $_ } @{ $csv->getline_all($fh) }; close $fh; return \%hash; } # write new data to file sub hash_to_csv { my ( $hash, $filepath ) = @_; open my $fh, ">:encoding(utf8)", "$filepath" or croak("cannot open $filepath: $!"); my $csv = Text::CSV->new( { binary => 1, eol => "\n" } ); for ( keys %$hash ) { my $colref = [ $_, $$hash{$_}->[0] ]; $csv->print( $fh, $colref ); } close $fh; return; } # send email notifications sub send_email { my ($body) = @_; open my $pipe, '|-', '/usr/bin/mailx', '-s', $email{subject}, $ema +il{to} or croak("can't open pipe to mailx: $!\n"); print $pipe $body; close $pipe; croak("mailx exited with a non-zero status: $?\n") if $?; return; } # extract date of most recent review from GreatSchools tree sub gs_checker { my $tree = shift; my $xpath = '//div[contains(@class,"media mbs")]/div[(@class="author small make-99 +9999 fl pbn mbn")]'; my $dates = $tree->findnodes($xpath); # dates returned as 'month dd, yyyy' my $date; $date = $$dates[0]->as_trimmed_text() if ( $$dates[0] ); if ( $date =~ /(\w{3,9})\s+(\d{1,2}),\s+(\d{4})/ ) { $date = $3 . '-' . $month{$1} . '-' . $2; } return ( $date || $default_date ); } # extract date of most recent review from Yelp tree sub yelp_checker { my $tree = shift; my $xpath = '//meta[@itemprop="datePublished"][1]'; my $dates = $tree->findnodes($xpath); # dates returned as 'yyyy-mm-dd' if ( $$dates[0] ) { return $$dates[0]->attr('content'); } else { return ( $$dates[0] || $default_date ); } } # extract date of most recent review from PrivateSchoolReview tree sub psr_checker { my $tree = shift; my $xpath = '//meta[@itemprop="datePublished"][1]'; my $dates = $tree->findnodes($xpath); # dates returned as 'yyyy-mm-dd' if ( $$dates[0] ) { return $$dates[0]->attr('content'); } else { return ( $$dates[0] || $default_date ); } } # extract date of most recent review from Kudzu tree sub kudzu_checker { my $tree = shift; my $xpath = '//div[@class="review_post_date"]/p/span[@class="rp-da +te"]'; my $dates = $tree->findnodes($xpath); # date returned as 'mm/dd/yyyy' my $date; $date = $$dates[0]->as_trimmed_text() if ( $$dates[0] ); if ( $date =~ /(\d{1,2})\/(\d{1,2})\/(\d{4})/ ) { $date = $3 . '-' . $1 . '-' . $2; } return ( $date || $default_date ); } # extract date of most recent review from MerchantCircle tree sub mc_checker { my $tree = shift; my $xpath = '//span[@itemprop="datePublished"][1]'; my $dates = $tree->findnodes($xpath); # dates returned as 'Month dd, yyyy at hh:mm PM' my $date; $date = $$dates[0]->as_trimmed_text() if ( $$dates[0] ); if ( $date =~ /\s*(\w{3,9})\s*(\d{1,2})\s*\,\s*(\d{4})\s+at\s+\d{1,2}\:\d{2} +\s+[AP]M/ ) { $date = $3 . '-' . $month{$1} . '-' . $2; } return ( $date || $default_date ); }
Install missing modules with Module::Extract::Install's cpanm-missing/cpanm-missing-deep
1 direct reply — Read more / Contribute
by frozenwithjoy
on Jul 24, 2014 at 12:07

    The other day I got a new laptop and tried to run a couple scripts on it. I quickly grew tired of the tedious cycle of 'Module::X not found' errors/installing Module::X. I decided to make a tool to improve the situation.

    The result, Module::Extract::Install, can be used to analyze perl scripts and modules to identify and install their dependencies in an automated, pain-free manner. You can use this module's methods to write your own script (e.g., to pipe missing modules to your favorite installer) or take advantage of the included command-line tools cpanm-missing (checks a list of Perl files) and cpanm-missing-deep (checks all the Perl files within a directory).

    Feel free to give me last minute comments/suggestions before I put it on CPAN (currently it is only available through GitHub). Thanks!

SysV shared memory (Look-Alike) -- pure perl
3 direct replies — Read more / Contribute
by flexvault
on Jul 20, 2014 at 16:42

    Dear Monks,

    I have stayed away from using shared memory because of the statement: "This function is available only on machines supporting System V IPC." in the documentation for use. I decided I had a good use and did a Super Search and found zentara's excellent work which I used as a starting point for this discussion. I re-read the documentation and looked at the books 'Programming Perl' and the 'Perl Cookbook', and wondered if I could do something similar with a RAM disk and not have a dependency on System V IPC support. So taking the code provided by zentara, and using it as a benchmark for my requirements, I started testing on a 8GB RAM disk on a Debian 64bit Linux box using a 32-bit 5.14.2 Perl. I found that I could get approximately 216K System V IPC writes per second(wps). WOW!

    Since I only needed 20-25K writes per second, I started working on my "shared memory look-alike". What I found was that I could do better than 349K wps. Actually the 1st run produced 800K wps, but I realized I didn't follow the format of zentara's script, so I modified the script to call a subroutine, flock the file, test return codes, etc. Currently, 349K wps is the worse case on a RAM disk, 291K wps on a 7,200 rpm hard disk, and 221K wps on a 5,400 rpm disk. (Note: I didn't have a SSD on the test system.) The code follows, and if I did something to make my numbers look better, I'd like to know.

    Update: Do not use this code as it mixes buffered and unbuffered I/O. See later for a sample that I believe works correctly!

    ####### shmem-init.pl ############################ #!/usr/bin/perl use warnings; use strict; use Time::HiRes qw( gettimeofday usleep ); use Fcntl qw( :DEFAULT :flock ); ## Part of core perl use IPC::SysV qw(IPC_STAT IPC_PRIVATE IPC_CREAT IPC_EXCL S_IRUSR S_IWU +SR IPC_RMID); # see "perldoc perlfunc /shmget" and "perldoc perlipc /SysV" # big difference from c is attach and detach is automatic in Perl # it attaches to read or write, then detaches my $go = 1; $SIG{INT} = sub{ $go = 0; &close_m(); #close up the shared mem exit; }; my $segment_hbytes = 0x640; # hex bytes, a multiple of 4k my ($segment_id, $segment_size) = &init_m($segment_hbytes); print "shmid-> $segment_id\tsize-> $segment_size\n"; # Counter Elap +sed time Writes/second # ------------- +---------------------------- my $stime = gettimeofday; my $i = 0; # Result: 2000000 9.27 +134203910828 215718/second while($go) { &write_m($i); $i++; if ( $i >= 2_000_000 ) { $stime = gettimeofday - $stime; my $rpm = int( 2_000_000 / + $stime ); print "$i\t$stime\t$rpm/second\n\n"; last; } #select(undef,undef,undef,.001); last if ! $go; } our $indexdb; # Counter Ela +psed time Writes/second # ------------ +----------------------------- my $file = "/dev/shm/FlexBase/__env.index"; # Result: 2000000 5.7 +3024797439575 349025/second # my $file = "/__env.index"; # Result: 2000000 6.8 +8051080703735 290676/second # my $file = "/flexvault/__env.index"; # Result: 2000000 9.0 +2671384811401 221564/second open( $indexdb,"+<", $file ) or die "Not open: $!"; $stime = gettimeofday; $i = 0; while( 1 ) { &write_mem($i); $i++; if ( $i >= 2_000_000 ) { $stime = gettimeofday - $stime; my $rpm = int( 2_000_000 / + $stime ); print "$i\t$stime\t$rpm/second\n"; last; } } close $indexdb; exit; sub write_mem() { our $indexdb; # Write a string to the shared file. my $message = shift; if ( flock( $indexdb, LOCK_EX ) ) { my $ret = sysseek( $indexdb, 0, 0); # move to beginning of fil +e if ( ! defined $ret ) { die "O04. sysseek failed: $!"; } $ret = syswrite ( $indexdb, $i, length($i) ); if ( $ret != length($i) ) { die "O05. syswrite failed! $!"; } } ## ## Make test ( 1==1 ) to verify syswrite worked correctly. ## Make test ( 1==2 ) to test speed of syswrite to filesystem. ## if ( ( 1==2 )&&( flock( $indexdb, LOCK_SH ) ) ) { my $ret = sysseek( $indexdb, 0, 0); # move to beginning of fil +e if ( ! defined $ret ) { die "O06. sysseek failed: $!"; } $ret = sysread ( $indexdb, my $ni, length($i) ); if ( $ni != $i ) { die "O07. |$ni|$i| $!"; } } return 0; } ################################################################# sub init_m(){ my $segment_hbytes = shift; # Allocate a shared memory segment. my $segment_id = shmget (IPC_PRIVATE, $segment_hbytes, IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR); # Verify the segment's size. my $shmbuffer = ''; shmctl ($segment_id, IPC_STAT, $shmbuffer); my @mdata = unpack("i*",$shmbuffer); #not sure if that is right unp +ack? works :-) return($segment_id, $mdata[9] ); } sub write_m() { # Write a string to the shared memory segment. my $message = shift; shmwrite($segment_id, $message, 0, $segment_size) || die "$!"; #the 0, $segment_size can be broke up into substrings like 0,60 # or 61,195, etc return 0; } sub close_m(){ # Deallocate the shared memory segment. shmctl ($segment_id, IPC_RMID, 0); return 0; } 1; __END__

    Regards...Ed

    "Well done is better than well said." - Benjamin Franklin

Yahoo Content Analyzer
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by Your Mother
on Jul 20, 2014 at 16:34

    Inspired by How to transmit text to Yahoo Content Analysis. Not sure how complete or correct it is, just threw it together for fun. Seems to work and Iíll make amendments as necessary or sanely suggested.

    Requires: strictures, LWP::UserAgent, Getopt::Long, Pod::Usage, Path::Tiny.

    #!/usr/bin/env perl use 5.010; use strictures; no warnings "uninitialized"; use LWP::UserAgent; use Getopt::Long; use Pod::Usage; use open qw( :encoding(UTF-8) :std ); use Path::Tiny; # use XML::LibXML; # For expansion... or XML::Rabbit my $service = "http://query.yahooapis.com/v1/public/yql"; my %opt = ( text => undef, url => undef, max => 100 ); # These are, luckily, false by default for Yahoo, so we only care abou +t true. my %boolean = map {; $_ => 1 } qw/ related_entities show_metadata enable_categorizer /; # What we compose to query, e.g. not "verbose" or "file." my %sql = ( %opt, %boolean ); my $ok = GetOptions( \%opt, "text=s", "file=s", "url=s", "max=i", "verbose", "help", keys %boolean ); pod2usage( -verbose => 0, -exitval => 1, -message => "Options were not recognized." ) unless $ok; pod2usage( -verbose => 2 ) if $opt{help}; pod2usage( -verbose => 0, -exitval => 1, -message => "One of these, at most, allowed: text, url, fil +e." ) if 1 < grep defined, @opt{qw/ text url file /}; # Only one, text|file, is allowed by Getopt::Long. $opt{text} ||= path($opt{file})->slurp if $opt{file}; unless ( $opt{url} || $opt{text} ) # Accept from STDIN. { say "Type away. ^D to execute (on *nix anyway)."; chomp( my @input = <> ); $opt{text} = join " ", @input; die "Give some input!\n" unless $opt{text} =~ /\w/; } my @where; for my $key ( keys %opt ) { next unless defined $opt{$key} and exists $sql{$key}; $opt{$key} = "true" if $boolean{$key}; $opt{$key} =~ s/([\\"'\0])/\\$1/g; push @where, sprintf "%s = '%s'", $key, $opt{$key}; } my $q = sprintf "SELECT * FROM contentanalysis.analyze WHERE %s", join " AND ", @where; say "SQL >> $q\n" if $opt{verbose}; my $ua = LWP::UserAgent->new; my $response = $ua->post( $service, [ q => $q ] ); say $response->request->as_string if $opt{verbose}; say $opt{verbose} ? $response->as_string : $response->decoded_content(); exit ! $response->is_success; __END__ =pod =encoding utf8 =head1 Name yahoo-content-analyzer - command-line to query it. =head1 Synopsis yahoo-content-analyzer -text "Perl is a programming language." -text "{command line string}" -file (slurp and submit as text) -url -max [100 is default] -related_entities -show_metadata -enable_categorizer -verbose -help =head1 Description L<https://developer.yahoo.com/search/content/V2/contentAnalysis.html> =head1 Code Repository L<http://perlmonks.org/?node_id=1094394> =head1 See Also L<https://metacpan.org/search?q=YQL>. =head1 Author and License Your Mother, L<http://perlmonks.org/?node_id=248054>. You may redistribute and modify this code under the same terms as Perl itself. =head1 Disclaimer of Warranty No warranty. No means no. =cut

    Updates/Changelog

    • Removed URI, only first draft used it.
commandline ftpssl client with Perl
1 direct reply — Read more / Contribute
by zentara
on Jul 05, 2014 at 12:37
    Recently, all my c-based ftpssl programs stopped working with ssl, namely gftp and lftp. I found that Net::FTPSSL still works great, but it isn't interactive, it allows just automated scripting. So, how to make an interactive session? I first thought of using a gui, but there was no real advantage to the gui, over the commandline, ( not without a huge amount of work ;-) ), so a simple commandline program fit the bill. Here it is. There is a second program below it, which runs it from a pty, in anticipation of channeling it into a Tk or GTk gui; but the gui's seems to have difficulty capturing the tty. If anyone can show how to get the ftpssl tty pty output into a textbox, I would be grateful.

    If you want to experiment on your own machine, Proftd works good when configured with --enable-tls, you can google for instructions.

    I used a little eval trick to pass the commands into the pty.

    Some common commands : list pwd cwd noop nlst mkdir('foo') rmdir('foo') put('somelocalfile', 'remotefile')

    The method set that comes with Net::FTPSSL is simple and easy.

    ftps-z: runs standalone or thru a pty as shown below

    #!/usr/bin/perl use strict; use warnings; use Net::FTPSSL; my $server = "127.0.0.1"; my $username = "someuser"; my $passwd = "somepass"; my @ret; my $ftps = Net::FTPSSL->new($server, Encryption => EXP_CRYPT, Debug => 1, # Croak => 1, ) or die "Can't open $server\n$Net::FTPSSL::ERRSTR"; $ftps->login($username, $passwd) or error("Credential error, $ftps->last_message"); # get default listing and pwd @ret = $ftps->list() or error("Command error, $ftps->last_message"); print "####################\n"; print join "\n", @ret,"\n"; print "####################\n"; # get default pwd @ret = $ftps->pwd or error("Command error, $ftps->last_message"); print "####################\n"; print join "\n", @ret,"\n"; print "####################\n"; if( -t STDIN ) { print "tty\n"; } while(1){ print "Hit Control-C to exit ... otherwise:\n"; print "Enter command: \n"; my $com = <STDIN>; chomp $com; if ($com =~ m/quit/){ print "exiting\n";} # needed this eval to get ftps methods to work with pty my @ret = eval "\$ftps->$com"; if($@) { print "@_\n"; } print "####################\n"; print join "\n", @ret,"\n"; print "####################\n"; if ($com =~ m/quit/){ print "exit command received, ftpssl exiting\n"; + print "Control-C to exit pty, or Shift-PageUp to + view log\n"; last; } } print "at end\n"; exit;
    IO-Pty-driver for above ftps-z
    #!/usr/bin/perl -w # Description: Fool a process into # thinking that STDOUT is a terminal, when in fact # basic PTY code from etcshadow use warnings; use strict; use IO::Pty; $SIG{CHLD} = 'IGNORE'; # for when we quit the ftpssl session my $pty = IO::Pty->new; my $slave = $pty->slave; open TTY,"/dev/tty" or die "not connected to a terminal\n"; $pty->clone_winsize_from(\*TTY); close TTY; my $pid = fork(); die "bad fork: $!\n" unless defined $pid; if (!$pid) { open STDOUT,">&=".$pty->fileno() or die $!; exec "./ftps-z"; }else{ $pty->close(); while (defined (my $line = <$slave>)) { print $line; } } while(1){ my $command = <>; print $slave "$command\n"; }

    I'm not really a human, but I play one on earth.
    Old Perl Programmer Haiku ................... flash japh
Vim: Auto highlight of variables
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by Loops
on Jun 27, 2014 at 18:49

    So Ovid made this blog post that gave an example of editing Perl in Vim -- when you move your cursor over a Perl variable it is highlighted in the rest of the document automatically. Quite handy.

    Paul Johnson then made some improvements and put the code in a Git repo so that it's very easy to install with Pathogen in Vim

    After cloning that repo into your Pathogen bundle directory, it pretty much just works as advertised. For some reason it does not work with Tim Popes "vim-sensible" plugin however.

    The highlighting is delayed until you haven't moved your cursor for the number of milliseconds set in the Vim "updatetime" variable. By default this is set to 4000 which is pretty slow. Doing "set ut=50" in your vimrc makes it much snappier.

    Enjoy.

    P.S. Anyone have an updated syntax file for 5.20.0 sub-signatures and other new features?

WWW::Mechanize inventory update for musicstack.com
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by maruhige
on Jun 24, 2014 at 11:21

    Spent a bit longer on this than needs be with hindsight, so I figure i'd share the product of that time

    Music stack doesn't have much in the way of an API, instead it requires manual navigation to upload change files. The change file also has an enormous amount of saved customisations on the upload form which would be numbingly tedious to fill out manually in the $mech itself

    So! here's a short and effective means of putting inventory files up on Music Stack, using WWW::Mechanize to navigate from the login screen to the upload screen.

    use WWW::Mechanize; my $username = 'x@example.com'; my $password = 'mypw'; my $upfile = '/path/to/additions.csv'; my $mech = WWW::Mechanize->new() or die $!; $mech->cookie_jar(HTTP::Cookies->new()); $mech->get(q#http://www.musicstack.com/login.cgi#) or die $!; #need to use sequential identifiers when forms are either nameless + or share the same name $mech->form_number(3); $mech->field ('user' => $username); $mech->field ('pw' => $password); $mech->click_button(name => "login"); #now on the user account page $mech->follow_link( text => 'Upload' );#case sensitive #now on the inventory management page $mech->form_name('form'); # 2 forms on page - other is 'search' # 3 options here - add is incremental $mech->set_fields('delete' => 'add'); $mech->field('upfile' => $upfile ); $mech->click_button(value => 'Upload File'); #the file is uploaded and the status screen displayed here print $mech-> content();
Tk Tartaglia's triangle fun - Pascal's triangle fun
2 direct replies — Read more / Contribute
by Discipulus
on Jun 17, 2014 at 12:56
           Dedicated to my father who studied the other Tartaglia
    After more then one month of sparetime works and 35 subversion i'm very happy to present you:

    16 fun experiments with the Tartaglia's triangle

    This is a Perl Tk program that shows many of the properties of such incredible triangle: you can modify the aspect of the triangle itself and of the output window and of the help pages too.

    In Italy the name of the arithmetic triangle is dedicated Tartaglia so I want to present with this name.

    I'm not a mathematician and the math used in the code is something late Middle Age, but works.

    If someone wish to improve this program i will be very happy: inernal math used, better explication in output windows, or even typos spot(i'm not english native, as you can guess) or suggestion are welcome. In fact i wish this program to be used in educational context.

    Have fun!

    L*


    Update 1/07/2014: commented lines 188-190 and 555 (printing debug info for windows dimensions and positioning).

    L*

    There are no rules, there are no thumbs..
    Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.
Storing Experience for Posterity
4 direct replies — Read more / Contribute
by GotToBTru
on Jun 12, 2014 at 10:34

    I put the following together to scrape experience, level and writeups off my profile page and store it in a text file on my computer, to record my progress through the Monastery. A scheduled task runs this once a day.

    use strict; use warnings; use LWP::Simple; use URI::URL; my $date=`ECHO %DATE:~10,4%%DATE:~4,2%%DATE:~7,2%`; # YYYYMMDD my $url = url('http://perlmonks.org/?node_id=844862'); my $content = get($url); $content =~ s/\cJ//g; $content =~ s/\cM//g; my ($experience, $level, $posts) = ($content =~ /Experience:\D+(\d+).+ Level:.+([A-Z][a-z]+\s+\(\d+\)).+ Writeups:.+>(\d+)</x); open my $ofh, '>>','perl_xp.dat'; printf $ofh "%d,%d,%d,%s\n",$date,$experience,$posts,$level; close($ofh);

    There is probably a way to do this in Javascript that could be included in the Free Nodelet, but that's beyond my skill level.

    Update

    Improved version here.

    1 Peter 4:10

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