`require': cannot load such file -- curses (LoadError) - ruby

Question

I am a ruby beginner and trying to understand and learn ruby. I came across this error while trying to run a ruby file which uses "require curses" but I am getting the following error while doing so. Any help or hint is appreciated.
desktop$ ruby curses.rb
/desktop/jsipp-master$ gem list
*** LOCAL GEMS ***
bigdecimal (1.2.8)
CFPropertyList (2.2.8)
curses (1.2.4)
did_you_mean (1.0.0)
enumerate (0.0.7)
enumerated (1.0.1)
enumeration (1.3.3)
ffi (1.9.25)
ffi-rzmq (2.0.6)
ffi-rzmq-core (1.0.6)
io-console (0.4.5)
json (1.8.3)
libxml-ruby (2.9.0)
minitest (5.8.5)
net-telnet (0.1.1)
nokogiri (1.5.6)
power_assert (0.2.6)
psych (2.1.0)
rake (10.4.2)
rdoc (4.2.1)
sqlite3 (1.3.11)
test-unit (3.1.5)
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- curses (LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from curses.rb:3:in `<main>'
jsipp-master$ ruby -v
ruby 2.3.3p222 (2016-11-21 revision 56859) [universal.x86_64-darwin17]
#!/usr/bin/ruby
require 'curses'
require 'ffi-rzmq'
require 'enumerator'
POSITIONS = "%15s %8s %8s %12s %12s %12s\n"
POSITIONS2 = "%-38s %-38s\n"
POSITIONS3 = "%15s %-12s%%-10s%%-10s%%-10s%%-15s\n"
OUT_ARROW = "-------->"
IN_ARROW = "<--------"
PAUSE = "[%6dms]"
class MinuteLongBuffer
def initialize
#values = []
end
def add v
#values << [Time.new.to_f, v]
end
def count
#values = #values.keep_if {|v| v[0] > (Time.new.to_f - 1)}
#values.length
end
end
class Scenario
def parse_scenario_desc desc
#strings = []
#msg_counts = []
parts = desc.split(";")
parts.each do |part|
type, value = part.split(":")
if type == "IN"
#strings << (POSITIONS3 % [value, IN_ARROW])
elsif type == "OUT"
#strings << (POSITIONS3 % [value, OUT_ARROW])
elsif type == "PAUSE"
#strings << (POSITIONS3 % [(PAUSE % value), ""])
end
#msg_counts << 0
#unexpected_msg_counts << 0
#timeout_counts << 0
end
end
def inc_msg idx
#msg_counts[idx.to_i] += 1
if idx.to_i == 0
#new_calls.add 1
end
end
def inc_unexpected idx
#unexpected_msg_counts[idx.to_i] += 1
end
def inc_timeout idx
#timeout_counts[idx.to_i] += 1
end
def update
Curses.clear
Curses.addstr(POSITIONS % ["Call-rate", "Length", "Port", "Total-time", "Total-calls", "Remote-host"])
Curses.addstr(POSITIONS % [("?cps"), "? ms", "????", ("%.2fs" % (Time.new.to_f - #start)), "?", "??? (???)"])
Curses.addstr("\n")
Curses.addstr(POSITIONS2 % ["%d new calls during 1.000s period" % #new_calls.count, "?ms scheduler resolution"])
Curses.addstr(POSITIONS2 % ["? concurrent calls (limit ?)", "Peak was ? calls, after ?s"])
Curses.addstr(POSITIONS2 % ["? out-of-call msg (discarded)", "? open sockets"])
Curses.addstr("\n")
Curses.addstr((POSITIONS3 % ["", "",]) % ["Messages", "Retrans", "Timeout", "Unexpected-Msg"])
#strings.each_with_index do |s, i|
Curses.addstr(s % [#msg_counts[i], 0, #timeout_counts[i], #unexpected_msg_counts[i]])
end
Curses.refresh
end
def initialize
#new_calls = MinuteLongBuffer.new
#strings = []
#msg_counts = []
#unexpected_msg_counts = []
#timeout_counts = []
#start = Time.new.to_f
Thread.new do
context = ZMQ::Context.new
socket = context.socket(ZMQ::SUB)
socket.connect("tcp://localhost:5556")
socket.setsockopt(ZMQ::SUBSCRIBE, "SIPP")
socket2 = context.socket(ZMQ::REQ)
socket2.connect("tcp://localhost:5557")
socket2.send_string "",0
socket2.recv_string msg2 = ""
parse_scenario_desc msg2
loop do
socket.recv_strings(msgs = [])
msgs.each do |msg|
name, ts, scenario, callnum, callid, idx, result = msg.split(":")
if name == "SIPP-PHASE_SUCCESS"
inc_msg idx
end
if name == "SIPP-UNEXPECTED_MSG_RECVD"
inc_unexpected idx
end
if name == "SIPP-RECV_TIMED_OUT"
inc_timeout idx
end
end
end
end
end
end
SCENARIO = Scenario.new
Curses.init_screen()
Thread.new do
loop do
tmp = Curses.getch
end
end
loop do
SCENARIO.update
sleep 1
end
Also when I check the ruby version it is pointing to 2.3.3 but while running the it shows me ruby 2.3.0 running the file. If someone could explain why is that would also help me.
After installing gems in file manually I am getting another error please see below.
/jsipp-master$ ruby curses.rb
Unable to load this gem. The libzmq library (or DLL) could not be found.
If this is a Windows platform, make sure libzmq.dll is on the PATH.
If the DLL was built with mingw, make sure the other two dependent DLLs,
libgcc_s_sjlj-1.dll and libstdc++6.dll, are also on the PATH.
For non-Windows platforms, make sure libzmq is located in this search path:
["/Library/Ruby/Gems/2.3.0/gems/ffi-rzmq-core-1.0.6/lib/ffi-rzmq-core/../../ext/libzmq.dylib", "/usr/local/bin/libzmq.dylib", "/usr/bin/libzmq.dylib", "/bin/libzmq.dylib", "/usr/sbin/libzmq.dylib", "/sbin/libzmq.dylib", "/opt/X11/bin/libzmq.dylib", "/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/libzmq.dylib", "/usr/local/lib/libzmq.dylib", "/opt/local/lib/libzmq.dylib", "/usr/local/lib/libzmq.dylib", "/usr/lib64/libzmq.dylib"]
/Library/Ruby/Gems/2.3.0/gems/ffi-rzmq-core-1.0.6/lib/ffi-rzmq-core/libzmq.rb:61:in `rescue in <module:LibZMQ>': The libzmq library (or DLL) could not be loaded (LoadError)
from /Library/Ruby/Gems/2.3.0/gems/ffi-rzmq-core-1.0.6/lib/ffi-rzmq-core/libzmq.rb:10:in `<module:LibZMQ>'
from /Library/Ruby/Gems/2.3.0/gems/ffi-rzmq-core-1.0.6/lib/ffi-rzmq-core/libzmq.rb:7:in `<top (required)>'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/2.3.0/gems/ffi-rzmq-core-1.0.6/lib/ffi-rzmq-core.rb:3:in `<top (required)>'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/2.3.0/gems/ffi-rzmq-2.0.6/lib/ffi-rzmq.rb:66:in `<top (required)>'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in `rescue in require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:40:in `require'
from curses.rb:4:in `<main>'

Answer 1

It is possible you have not installed the curses gem.
You can check to see if it is installed using the gem list command. If your gem is not listed, it isn't installed:
$ gem list curses
*** LOCAL GEMS ***
$
If it is not installed, install the gem using the gem install command:
$ gem install curses
Fetching: curses-1.2.4.gem (100%)
Building native extensions. This could take a while...
Successfully installed curses-1.2.4
Parsing documentation for curses-1.2.4
Installing ri documentation for curses-1.2.4
Done installing documentation for curses after 0 seconds
1 gem installed
$
You can read more in the online gem command reference.
That should get you beyond the error you are seeing.