In this program, first it will ask the user what to do. User can choose to type a new document, open an existing document, or exit the program. If user choose to type a new document, the program will loops while get the input from user and save it in a variable 'text' until user input ':eof:'. After that, the program ask the user where to save the file by opening a save dialog (a function). Then, it will ask the user the file name. Finally, write the variable 'text' to the specified file.
If user choose to open an existing document, the program ask the user where is the file located by opening an open dialog (a function). After that, the program will loops while get the input from the file and save it in an array named 'linecontent' until the end of the file. After reading, the program will show two option to edit the file. The first one is to replace whole selected line. The second one is to find some string and replace all occurrence of that string with the string inputted by user. Both action will use or modify the array 'linecontent' before. After each finished action, it will saved to the file automatically.
Now about the dialog function, it will ask one parameter 'type'. The function will show the current directory path and the content of that directory. User can also change the current directory by using command menu or enter a directory number (see previous post for detail). If the type is open, user must choose one file, and the function will return that file path. But if the type is save, user must choose a directory, and the function will return the current directory path.
Here's the output if you're having difficulty in imagining what I tell you before:
CONSOLE TEXT EDITOR ------------------- 1. New 2. Open 3. Exit What do you want to do? > 1 Start typing your document now. Enter ":eof:" if you has finished typing. LINE 1 | Hello! Hello, LINE 2 | world... LINE 3 | LINE 4 | - Ruby LINE 5 | :eof: Specify the folder where you want to save the new document! Current directory: C:/Documents and Settings/Admin/Desktop/RubyApp1/lib Directory content: 1. a.txt 0.02 KiB 2. editor.rb 5.03 KiB 3. fileinfogetter.rb 2.44 KiB 4. productmanager.rb 2.92 KiB Available Commands: U: To Upper R: To Root G: Go to D: Save in this directory Type your selected item number, or command letter > g Go to what directory? > d:\ Current directory: D:/ Directory content: 1. [Directory] $AVG 2. [Directory] System Volume Information 3. Thumbs.db 10.50 KiB Available Commands: U: To Upper R: To Root G: Go to D: Save in this directory Type your selected item number, or command letter > d Selected folder: D:/ Now specify the file name! > Hello.txt File saved. CONSOLE TEXT EDITOR ------------------- 1. New 2. Open 3. Exit What do you want to do? > 2 Current directory: D:/ Directory content: 1. [Directory] $AVG 2. [Directory] System Volume Information 3. Hello.txt 0.03 KiB 4. Thumbs.db 10.50 KiB Available Commands: U: To Upper R: To Root G: Go to C: Cancel Type your selected item number, or command letter > 3 -- [BEGINNING OF FILE] -- LINE 1 | Hello! Hello, LINE 2 | world... LINE 3 | LINE 4 | - Ruby -- [END OF FILE] -- 1. Replace line 2. Replace string 3. Exit editing What do you want to do? > 1 Replace line : 2 Selected line: world... Replace with : Earth... File saved. 1. Replace line 2. Replace string 3. Exit editing What do you want to do? > 2 Replace what: e Replace with: a File saved. 1. Replace line 2. Replace string 3. Exit editing What do you want to do? > 3 CONSOLE TEXT EDITOR ------------------- 1. New 2. Open 3. Exit What do you want to do? > 2 Current directory: D:/ Directory content: 1. [Directory] $AVG 2. [Directory] System Volume Information 3. Hello.txt 0.03 KiB 4. Thumbs.db 10.50 KiB Available Commands: U: To Upper R: To Root G: Go to C: Cancel Type your selected item number, or command letter > 3 -- [BEGINNING OF FILE] -- LINE 1 | Hallo! Hallo, LINE 2 | world... LINE 3 | LINE 4 | - Ruby -- [END OF FILE] -- 1. Replace line 2. Replace string 3. Exit editing What do you want to do? > 3 CONSOLE TEXT EDITOR ------------------- 1. New 2. Open 3. Exit What do you want to do? > 3
I originally typed the code in NetBeans, but you can try to run it using another IDE or interpreter. So, here's the code. If you don't understand some part of it, you can ask it through the comment in this post.
def dialog (type)
begin
no = 0
item = Array.new
puts 'Current directory: ' << Dir.pwd
puts 'Directory content: '
for x in Dir.entries(Dir.pwd)
if File::directory?(x) == true and x!='.' and x!='..' and no < 1000
no += 1
item[no] = x
puts no.to_s.rjust(3)<<'. [Directory] '<<item[no][0..49].ljust(50)
end
end
for x in Dir.entries(Dir.pwd)
if File::directory?(x) == false and no < 1000
no += 1
item[no] = x
print no.to_s.rjust(3) << '. ' << item[no][0..47].ljust(48)
begin
filesize = (File::size?(x)/1024.0)
printf "%10.2f KiB", filesize
rescue
print ' (N/A) KiB'
end
puts
end
end
puts
puts 'Available Commands:'
print 'U: To Upper'.ljust(15)<<'R: To Root'.ljust(15)
print 'G: Go to'.ljust(15)
puts 'C: Cancel'.ljust(15) if type=='open'
puts 'D: Save in this directory'.ljust(15) if type=='save'
puts
puts 'Type your selected item number, or command letter'
print '> '
input = gets.chomp.downcase
case input
when 'u'
Dir.chdir('..')
when 'r'
Dir.chdir(Dir.pwd[0..2])
when 'g'
puts 'Go to what directory?'
print '> '
foldergoto = gets.chomp.downcase
begin
Dir.chdir(foldergoto)
rescue Exception => e
puts e.message
gets
end
when 'c'
return if type=='open'
when 'd'
return Dir.pwd if type=='save'
else
inputint = input.to_i
if inputint < 1 or inputint > item.length - 1
puts 'Invalid input. Max. value is ' << (item.length - 1).to_s
gets
else
if File::directory?(item[inputint]) == true
begin
Dir.chdir(item[inputint])
rescue Exception => e
puts e.message
gets
end
else
return item[inputint]
end
end
end
end until input == 'c'
end
#Dir.chdir("D:/")
begin
puts "\n" * 25
puts 'CONSOLE TEXT EDITOR'
puts '-------------------'
puts
puts '1. New'
puts '2. Open'
puts '3. Exit'
puts
puts 'What do you want to do?'
print '> '
inputmain = gets.to_i
case inputmain
when 1 #New
puts
print 'Start typing your document now. '
puts 'Enter ":eof:" if you has finished typing.'
puts
text = ''
line = 1
begin
print 'LINE '<<line.to_s.ljust(4)<<' | '
thisline = gets
text += thisline if thisline.chomp != ':eof:'
line += 1
end until thisline.chomp == ':eof:'
puts
puts 'Specify the folder where you want to save the new document!'
gets
namafolder = dialog 'save'
puts
puts 'Selected folder: ' << namafolder
puts 'Now specify the file name!'
print '> '
namafile = gets.chomp
file = File.new(namafolder<<"/"<<namafile, 'w')
file.print text
file.close()
puts 'File saved.'
when 2 #Open
line = 1
linecontent = Array.new
namafile = dialog 'open'
puts
puts '-- [BEGINNING OF FILE] --'
file = File.new(namafile, 'r')
file.each {|thisline|
puts 'LINE '<<line.to_s.ljust(4)<<' | '<<thisline.chomp
linecontent[line] = thisline
if line % 20 == 0
puts 'Press Enter to continue.'
gets
end
line += 1
}
file.close()
puts '-- [END OF FILE] --'
puts
begin
puts '1. Replace line'
puts '2. Replace string'
puts '3. Exit editing'
puts
puts 'What do you want to do?'
print '> '
input2 = gets.to_i
case input2
when 1
print 'Replace line : '
whichline = gets.to_i
if whichline < 1 or whichline > linecontent.length-1
puts 'Invalid input. Max. value is '<<(linecontent.length-1).to_s
else
puts 'Selected line: ' << linecontent[whichline]
print 'Replace with : '
replacewith = gets
file2 = File.new(namafile, 'w')
linew = 1
while linew < linecontent.length
file2.print replacewith if linew == whichline
file2.print linecontent[linew] if linew != whichline
linew += 1
end
file2.close()
puts 'File saved.'
end
when 2
print 'Replace what: '
replacewhat = gets.chomp
print 'Replace with: '
replacewith = gets.chomp
file2 = File.new(namafile, 'w')
linew = 1
while linew < linecontent.length
linecontent[linew]=linecontent[linew].tr(replacewhat,replacewith)
file2.print linecontent[linew]
linew += 1
end
file2.close()
puts 'File saved.'
when 3
print ''
else
puts 'Invalid input.'
end
gets
end until input2 == 3
when 3 #Exit
print ''
else
puts 'Invalid input'
end
gets
end until inputmain == 3
#
I think that's all for now. I hope this article can made you understand how to access file and directory, file reading, editing, and writing in Ruby. See you in the next post.
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