h1. roo
h2. What
This gem allows you to access the content of
* Open-office spreadsheets (.ods)
* Excel spreadsheets (.xls) and
* Google (online) spreadsheets
h2. Installing
[sudo] gem install roo
h2. The basics
Currently only read-access is implemented.
Google spreadsheets can be read and written.
Please note that the upper left cell of a table is numbered (1,1) or (1,'A') (not 0,0).
h2. Demonstration of usage
Supposed you have created this spreadsheet:
which includes the amount of work you have done for a customer.
You can now process this spreadsheet with the following sample code.
1 require 'rubygems'
2 require 'roo'
3
4 HOURLY_RATE = 123.45
5
6 oo = Openoffice.new("simple_spreadsheet.ods")
7 oo.default_sheet = oo.sheets.first
8 4.upto(12) do |line|
9 date = oo.cell(line,'A')
10 start_time = oo.cell(line,'B')
11 end_time = oo.cell(line,'C')
12 pause = oo.cell(line,'D')
13 sum = (end_time - start_time) - pause
14 comment = oo.cell(line,'F')
15 amount = sum * HOURLY_RATE
16 if date
17 puts "#{date}\t#{sum}\t#{amount}\t#{comment}"
18 end
19 end
which produces this output
2007-05-07 1.0 123.45 Task 1
2007-05-07 1.75 216.0375 Task 1
2007-05-07 1.0 123.45 Task 2
2007-05-08 1.0 123.45 Task 2
2007-05-08 1.0 123.45 Task 3
2007-05-08 0.5 61.725 Task 3
2007-05-14 0.5 61.725 Task 3
2007-05-14 0.5 61.725 Task 3
2007-05-15 1.0 123.45 Task 3
With the methods
first_column,
last_column,
first_row and
last_row
you can change line 8 from
4.upto(12) do |line|
to
4.upto(oo.last_row) do |line|
h3. Cell Types
oo.*celltype*(row,col) returns the type of a cell. Currently these types will be
returned:
* :float
* :string
* :date
* :percentage
* :formula
h3. Write access
Cells in a google spreadsheet can be read or written.
To write to a cell use the method call:
oo.set_value(row, col, value)
There is an example in the examples folder which illustrates write access.
h3. Formulas
Formulas in Openoffice- and Google-Spreadsheets can be handled.
oo.*celltype*(row,col) returns :formula if there is a formula in this cell.
oo.*formula?*(row,col) returns true if there is a formula
oo.*formula*(row,col) returns the formula in this cell in a string variable (like "=SUM([.A1:.M13])"). You can do whatever you want with this expression.
If there is no formula in this cell nil is returned.
oo.*cell*(row,col) returns the computed result of the formula (as it was saved in the file, no recalculation is done in this Gem).
oo.*formulas* returns all formulas in the selected spreadsheet in an array like this:
[[1,2,"=SUM(.A1:.B1)"],
[1,3,"=SIN(.C3)"],
[1,4,"=COS(.D4)"]]
Each entry consists of the elements row, col, formula.
Note: oo.*cell*(row,col) is the same for ordinary cells and formulas. So you can use the computated value of a formula. If you have to distinguish if a cell is a formula use #*formula*?
Please note: formulas in Excel-Spreadsheets cannot be handled (this is another gem, see: "Thanks")
h3. YAML-Output
You can generate YAML-Output from your spreadsheet data. The method is called:
oo.to_yaml # => produces YAML output from the entire default spreadsheet
oo.to_yaml({"myattribute1" => "myvalue1", "myattribute2" => "myvalue2")
# => YAML output with additional attributes
oo.to_yaml({..}, 2,10, 300,10) # => only the rectangle from row 2, column 10 to row 300, column 10 will be returned
If you omit one or more parameters the maximum boundaries of your spreadsheet will be used.
With the YAML output you can import your data in a Ruby on Rails application in a manner that spreadsheet data can accessed in a Rails application.
This is not limited to a Rails application - you can also do further evaluations with your data.
h3. CSV-Output
You can generate output in csv-format with
oo.to_csv
to write to the standard output or
oo.to_csv("somefile.txt")
to write to a file.
h3. Using MS-Excel spreadsheets
You can also access MS-Excel spreadsheat.
Replace Openoffice with
oo = Excel.new("simple_spreadsheet.xls").
All methode are the same for OpenOffice-, Excel- and Google-objects.
The only difference
is the setting of the default-worksheet. OpenOffice uses the name of the worksheet whereas Excel needs the index of the worksheet (1,2,3,..).
Formulas can only be handled in OpenOffice- and Google-spreadsheets.
Features in OpenOffice/Excel/Google:
table(border:1px solid black).
|feature|Open Office|Excel|Google|
|formulas|yes|no|yes|
|celltype|:percentage|:float|:percentage|
|access|read-only|read-only|read and write|
The parseexcel-gem does not support the celltype 'percentage' but uses 'float' instead. This is not a big deal as you can also use 'float' to do calculations with these cells.
Old .sxc OpenOffice files are currently not supported - please load these files and save it as an "OpenDocument Spreadsheet (.ods)".
Instead of a filename the Google#new method needs the 'key' of a Google-Spreadsheet. This key can be copied from the URL when you display a google spreadsheet with your browser.
If you want to use Google spreadsheets you must either have set the
environment variables 'GOOGLE_MAIL' and 'GOOGLE_PASSWORD' or you pass
the Google-name and -password to the Google#new method.
Setting these variables can be done if you add these lines to your
~/.bashrc (or similar setup file within other shells):
export GOOGLE_MAIL="yourname@gmail.com"
export GOOGLE_PASSWORD="mysecretpassword"
This gem does not check if you are allowed to access a specific google spreadsheet. If it's not your own spreadsheet or you are not allowed to read or wwrite to a spreadsheet the behaviour is not defined (but it will not work ;-) ).
h3. Accessing Spreadsheet over the Web
You can even read openoffice or excel-spreadsheets from a http-address:
oo = Excel.new("http://www.somedomain.com/simple_spreadsheet.xls").
oo = Openoffice.new("http://www.somedomain.com/simple_spreadsheet.ods").
or a zipped file:
oo = Excel.new("http://www.somedomain.com/simple_spreadsheet.xls.zip",:zip).
oo = Openoffice.new("http://www.somedomain.com/simple_spreadsheet.ods.zip",:zip).
after working with a spreadsheet from the web you have to call
oo.remove_tmp
to delete the temporary local copy of the spreadsheet file. If you dont call
this method you will have subdirectories names 'oo_xxxxx' which you can remove manually.
Calling remove_tmp is not the best solution to clean temporary files - i will
provide a better solution in the next releases.
h3. Remote Access
You can even access your spreadsheet data from a remote machine via SOAP. The examples directory shows a little example how to do this. If you like, you can extend these functions or restrict the access to certain cells.
Remote access with SOAP is nothing specific to roo, you can do this with every Rub object, but i thought it would nice to give an example what could be done with roo.
h3. Excel spreadsheets / Openoffice spreadsheets / Google spreadsheets with Ruby on Rails
There is a simple helper method to display a spreadsheet at your application page:
* in your controller, add "require 'roo'" and "@rspreadsheet = Openoffice.new("numbers1.ods")" or
"@rspreadsheet = Openoffice.new("http://www.somehost.com/data/numbers1.od s")" to get access to your spreadsheet file
* use it in any view of your application with "<%= spreadsheet @rspreadsheet, ["Tabelle"] %>
" or one of the following formats
h2. Where is it used?
How do you use roo? What are you doing with roo?
* The author of this gem uses roo for the generation of weekly reports which are (automatically) sent to his customers (Thomas Preymesser, Homepage: www.thopre.com, Blog: thopre.wordpress.com, email me: thopre@gmail.com)
If you have an interesting application where you use roo then write me a short description of your project and i will publish it here (write, if your email-address should be published or not).
Or you can write directly in the project wiki at "http://roo.rubyforge.org/wiki/wiki.pl?Who's_Using_Roo":http://roo.rubyforge.org/wiki/wiki.pl?Who's_Using_Roo
If you don't want to publish the details you can also write me an email and state, that it should not be published - i am just curious to hear, where it is used.
h2. Documentation
"rdoc":rdoc/index.html
Only the Openoffice- and Excel-parts of this gem are currently working - the Google-Spreadheets are experimental and are currently NOT working. Don't use this!
Google spreadsheet can now be used.
h2. Feature Requests / Bugs
Submit Feature Requests and bugs here: "http://rubyforge.org/tracker/?group_id=3729":http://rubyforge.org/tracker/?group_id=3729
h2. Forum
International Group:
"http://groups.google.com/group/ruby-roo":http://groups.google.com/group/ruby-roo
Deutschsprachige Group:
"http://groups.google.com/group/ruby-roo-de":http://groups.google.com/group/ruby-roo-de
h2. Wiki
"http://roo.rubyforge.org/wiki/wiki.pl":http://roo.rubyforge.org/wiki/wiki.pl
h2. How to submit patches
Read the "8 steps for fixing other people's code":http://drnicwilliams.com/2007/06/01/8-steps-for-fixing-other-peoples-code/ and for section "8b: Submit patch to Google Groups":http://drnicwilliams.com/2007/06/01/8-steps-for-fixing-other-peoples-code/#8b-google-groups, use the Google Group above.
h2. License
This code is free to use under the terms of Ruby
h2. Contact
Comments are welcome. Send an email to "Thomas Preymesser":mailto:thopre@gmail.com.
h2. Thanks
* "Dr Nic Williams":http://rubyforge.org/users/nicwilliams/ for his wonderful gem '"newgem":http://rubyforge.org/projects/newgem/' which makes it very convenient to create, manage and publish Ruby gems
* for the Excel-part the "spreadsheet":http://rubyforge.org/projects/spreadsheet/ gem is used. My functions are a convenient wrapper around the functions of this gem
* Dirk Huth fürs Testen unter Windows