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-rw-r--r--sample/curses/view.rb91
1 files changed, 91 insertions, 0 deletions
diff --git a/sample/curses/view.rb b/sample/curses/view.rb
new file mode 100644
index 00000000000..bc54aeb9afa
--- /dev/null
+++ b/sample/curses/view.rb
@@ -0,0 +1,91 @@
+#!/usr/local/bin/ruby
+
+require "curses"
+include Curses
+
+#
+# main
+#
+
+if ARGV.size != 1 then
+ printf("usage: view file\n");
+ exit
+end
+begin
+ fp = open(ARGV[0], "r")
+rescue
+ raise "cannot open file: #{ARGV[1]}"
+end
+
+# signal(SIGINT, finish)
+
+init_screen
+#keypad(stdscr, TRUE)
+nonl
+cbreak
+noecho
+#scrollok(stdscr, TRUE)
+
+# slurp the file
+data_lines = []
+fp.each_line { |l|
+ data_lines.push(l)
+}
+fp.close
+
+
+lptr = 0
+while TRUE
+ i = 0
+ while i < lines
+ setpos(i, 0)
+ #clrtoeol
+ addstr(data_lines[lptr + i] || '')
+ i += 1
+ end
+ refresh
+
+ explicit = FALSE
+ n = 0
+ while TRUE
+ c = getch
+ if c =~ /[0-9]/
+ n = 10 * n + c.to_i
+ else
+ break
+ end
+ end
+
+ n = 1 if !explicit && n == 0
+
+ case c
+ when "n" #when KEY_DOWN
+ i = 0
+ while i < n
+ if lptr + lines < data_lines.size then
+ lptr += 1
+ else
+ break
+ end
+ i += 1
+ end
+ #wscrl(i)
+
+ when "p" #when KEY_UP
+ i = 0
+ while i < n
+ if lptr > 0 then
+ lptr -= 1
+ else
+ break
+ end
+ i += 1
+ end
+ #wscrl(-i)
+
+ when "q"
+ break
+ end
+
+end
+close_screen