#!/usr/bin/env python
## Free Libraries Gopher Client (see version number in below tuple)
## Jul 2012
## License: Public Domain
## Very Beta

geo = (80, 24, "<-' go <- back ^ v scroll    Free Libraries Gopher Client 0.2 (Public Domain)")
import curses
from os import popen
from os import system
from sys import argv

## changelog:
##
## 0.2:
## now targets both python 2 and 3 compatibility (print() / curses work in both)
## light support for url proxies (gopherurl://path/proxy?proxiedgopherurl)
## any movement of selection bar shows current or hovered url at bottom
## not new: using "back" autoscrolls to top... new: except for single step back
## (makes it a little less tedious to explore trees with minimal usage change)
## may have fixed cosmetic line width bug
## slightly better support of 40 columns

if geo[0] < 80:
   geo = (geo[0], geo[1], "<-back ^v scr FLGC 0.2(Public Domain)")
if geo[0] < 40:
   print("FLGC 0.2")
   print("(Public Domain)")
   print ()
   print("This should probably")
   print("be run with at least")
   print("40 columns. hit enter")
   print("to try it anyway.")
   print()
   try:
       nul = input()
   except:
       pass

yescurl = int(popen("which curl | wc -l").readline())
if not yescurl:
   print("This program will not work without curl.")
   print()
   print("Suggestion: sudo apt-get install curl (for Debian/Ubuntu/Trisquel/GNewSense)")
   print("                sudo yum install curl (for Fedora/Freedora/etc)")
   print("")
   exit()
text = ""

url = ""
try:
   url = argv[1]
except:
   pass
if url == "":
   #try:
   #    print("enter the name of a gopher site:", end=" ") ## python 3
   #except SyntaxError:
   #    print("enter the name of a gopher site:"),
   ## that failed, so bash will do it:
   system("echo -n \"enter the name of a gopher site: \"")
   try:
       url = raw_input().strip() ## python 2
   except NameError:
       url = input().strip()

def c(p):
   global url
   spaghetti = 0 ## this is related to the "back" function, sorry
   if not "gopher://" in url.lower():
       url = "gopher://" + url
   if url.lower()[:9] != "gopher://":
       url = "gopher://" + url
   global text # for debugging output
   text = url
   history = []
   yescaca = int(popen("which cacaview | wc -l").readline())
   oneselected = 0
   keeponescrolllocation = 0 ## save cursor position history (one deep)
                             ## could do fully, but it really should reset
   x = 0
   while x not in [27, ord("x"), ord("q"), ord("Q"), ord("X")]:
       yindex = 0
       yib = 0
       global geo
       thistype = "1"
       rurl = url
       if rurl[:9].lower() == "gopher://":
           rurl = rurl[9:]
       try:
           thistype = rurl.split("/")[1]
           text = thistype
       except:
           pass
       proxy = "gopher://127.0.0.1/1/cgi-bin/proxy?"
       proxy = "" ## remove or set this if you want to use the proxy feature
       f = list(popen("curl -s \"" + proxy + url + "\" 2> /dev/null").readlines())
       history += [url]
       if len(history) > 50:
           history = history[-50:] ## conservative ; try 1000 or even remove
       for lenf in range(3):
           f = [""] + f
       if len(f) < geo[1]:
           while len(f) < geo[1]:
               f += [""]
       for lenf in range(geo[1]):
           f += [""]
       x = 0
       while x not in [27, curses.KEY_ENTER, 10, ord("x"), ord("X"), ord("q"), ord("Q")]:
           ## because curses.KEY_ENTER wasn't being trapped; LF was, go figure
           if x == curses.KEY_PPAGE:
               oneselected = 1
               yindex -= (geo[1] - 1)
               if yindex < 0:
                   yindex = 0
           if x == curses.KEY_NPAGE:
               oneselected = 1
               yindex += geo[1] - 1
               if yindex > len(f) - geo[1]:
                   yindex = len(f) - geo[1]
           if x == curses.KEY_UP:
               oneselected = 1
               yindex -= 1
               if yindex < 0:
                   yindex = 0
           if x == curses.KEY_DOWN:
               oneselected = 1
               yindex += 1
               if yindex > len(f) - geo[1]:
                   yindex = len(f) - geo[1]
           if x == curses.KEY_HOME:
               oneselected = 1
               yindex = 0
           if x == curses.KEY_LEFT:
               if len(history) > 1:
                   try: ## lazy
                       history = history[:-1]
                       newurl = history[len(history) - 1]
                       history = history[:-1]
                       url = newurl
                       text = newurl
                   except:
                       pass
               else:
                   x = 126
           if x == curses.KEY_END:
               oneselected = 1
               yindex = len(f) - geo[1] -1
           if spaghetti: ## if page is from url history
               yindex = keeponescrolllocation
               keeponescrolllocation = 0 ## otherwise it keeps using it
           if yindex != yib or yib == 0:
               hoverurl = ""
               try:
                   hoverurl = rurl ## first try url that's being viewed...
                   if thistype == "1" and f[yindex + 3][0] in "0I1":
                       hoverurl = f[yindex + 3].split("\t")[2] + ":" + f[yindex + 3].split("\t")[3].rstrip() + "/" + f[yindex + 3][0] + f[yindex + 3].split("\t")[1]
                   ## ...then if possible / applicable, url that's highlighted by user
               except:
                   pass
               p.clear()
               for pp in range(0, geo[1] - 1):
                   thisline = f[pp + yindex].rstrip()
                   if thistype == "1" and len(thisline):
                       hint = ""
                       if thisline[0] == "0":
                           hint = "(TEXT) "
                       elif thisline[0] == "1":
                           hint = " (DIR) "
                       elif thisline[0] == "i":
                           hint = ""
                       elif thisline[0] == "I":
                           hint = " (IMG) "
                       if thisline[0] in "01iI":
                           thisline = hint + thisline.split("\t")[0][1:]
                   ntab = " " * 4 ## this might fix the line width issue
                   if pp == 3:
                       bar = ntab.join(str(thisline + (" " * geo[0])).split("\t"))
                       ## for whatever reason, this doesn't exactly
                       p.addstr(pp, 0, bar[:geo[0]], curses.A_REVERSE)
                       p.addstr(pp + 1, 0, " " * geo[0])
                   else:
                       p.addstr(pp, 0, ntab.join(thisline.split("\t"))[:geo[0]])
               yib = yindex
               p.refresh()
           p.addstr(geo[1] - 1, 0, " " * (geo[0] - 1), curses.A_REVERSE)
           if hoverurl and oneselected: ### and int(geo[0]) > 79: ## 79 regardless of screen dim
               hoverurl = hoverurl[:geo[0] - 2]
               urlstatus = hoverurl + " " * (geo[0] - 2 - len(hoverurl))
               p.addstr(geo[1] - 1, 0, " " + urlstatus, curses.A_REVERSE)
           else:
               p.addstr(geo[1] - 1, 0, " " + geo[2], curses.A_REVERSE)
           p.addstr(geo[1] - 1, geo[0] - 1, "", curses.A_REVERSE)
           p.refresh()
           spaghetti = 0
           if x != curses.KEY_LEFT:
               x = p.getch()
           else:
               spaghetti = 1 ## make an exception for the back function
               x = 10
           if x == 10 or x == curses.KEY_ENTER:
               oneselected = 0 ## fix this line if you want status ready on new pages
               if spaghetti == 0:
                   rstr = f[yindex + 3] ## the contents of the selected line
                   keeponescrolllocation = yindex
                   typifany = ""
                   ## typifany: derived from link you're hovering over
                   ## thistype: type / page you're already viewing
                   if len(rstr) and thistype == "1":
                       ## if thistype isn't 1,  ^ parsed line doesn't count
                       ## (i.e. because you're viewing type 0)
                       typifany = rstr[0] ## get gophertype, (or " ", or "")
                   if typifany == "0":
                       if len(rstr.split("\t")) > 3:
                           typs = "/" + typifany
                           desc = rstr.split("\t")[0][1:]
                           rsel = rstr.split("\t")[1]
                           serv = rstr.split("\t")[2]
                           ## port field is often last, so remove \r\n
                           port = rstr.split("\t")[3].rstrip()
                           newurl = "gopher://" + serv + ":" + port + typs + rsel
                           url = newurl
                   elif typifany == "1":
                       if len(rstr.split("\t")) > 3:
                           typs = "/" + typifany
                           desc = rstr.split("\t")[0][1:]
                           rsel = rstr.split("\t")[1]
                           serv = rstr.split("\t")[2]
                           ## port field is often last, so remove \r\n
                           port = rstr.split("\t")[3].rstrip()
                           newurl = "gopher://" + serv + ":" + port + typs + rsel
                           url = newurl
                   elif typifany == "I":
                       if len(rstr.split("\t")) > 3:
                           typs = "/" + typifany
                           desc = rstr.split("\t")[0][1:]
                           rsel = rstr.split("\t")[1]
                           serv = rstr.split("\t")[2]
                           ## port field is often last, so remove \r\n
                           port = rstr.split("\t")[3].rstrip()
                           newurl = "gopher://" + serv + ":" + port + typs + rsel
                           system("curl -s \"" + newurl + "\" > /tmp/cacav 2> /dev/null ; cacaview /tmp/cacav 2> /dev/null")
                       else:
                           x = 126 ## pretend enter wasn't pressed
                   else:
                       x = 126 ## no plans to map this
curses.wrapper(c)

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