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#virtual filesystem module
#version 2.0

def path(path):
  i=len(path)-1
  while i!=0 and path[i] !="/":
    i-=1
  return ("/"+path[0:i],path[i+1:len(path)]) if i!=0 else (path[0:i],path[i:len(path)])






fstree=["folder",{},"rw-rw-rw-"]
dosSyst=("bin","dev","etc","home","lib","media","mnt","opt","proc","root","run","sbin","srv","sys","tmp","usr","var")
for i in dosSyst:
  fstree[1][i]=["folder",{},"rw-rw-rw-"]
fstree[1]["usr"][1]["users"]=["data","admin bobb\npassword Bobb_56"]
fswd=["root"]
fsdir=fstree[1]["root"]
del dosSyst


def cd(name="/root"):
  #lister les dossiers successifs
  global fswd
  global fsdir
  if name[0]=="/":#chemin absolu
    fswd=[]
    name=name[1:len(name)]
  
  l=[]
  deb=0
  for i in range(len(name)):
    if name[i]=="/":
      l.append(name[deb:i])
      deb=i+1
    if i==len(name)-1:
      l.append(name[deb:len(name)])
  for name in l:
    if name=="..":
      del fswd[-1]
    else:
      fswd.append(name)
  #aller dans le dossier
  fsdir=fstree
  for i in fswd:
    if fsdir[1][i][0]=="folder":
      fsdir=fsdir[1][i]
    else:
      print(i,"is not a folder.")
      del fswd[-1]
  
  return "/"+"/".join(fswd)

def ls(l=""):
  if l=="":
    for i in fsdir[1]:
      print(i,end="   ")
  elif l=="-l":
    for i in fsdir[1]:
      print(i, fsdir[1][i][2])
  print("\n",end="")


def pwd():
  wd="/"+"/".join(fswd)
  print(wd)
  return wd

def mkdir(*name):
  wdDeb="/"+"/".join(fswd)
  for i in name:
    i=path(i)
    cd(wdDeb+i[0])
    if not(i[1] in fsdir[1]):
      fsdir[1][i[1]]=["folder",{},"rw-rw-rw-"]
    else:
      print(i[1],"already exists")
  cd(wdDeb)

def su():
  l=fstree[1]["usr"][1]["users"][1].split()
  if input("Username: ")==l[l.index("admin")+1] and input("Password: ")==l[l.index("admin")+3]:
    print("Welcome")
  else:
    print("Authentification failed")



def touch(*name):
  wdDeb="/"+"/".join(fswd)
  for i in name:
    i=path(i)
    cd(wdDeb+i[0])
    if not(i[1] in fsdir[1]):
      fsdir[1][i[1]]=["file","","rw-rw-rw-"]
    else:
      print(i[1],"already exists")
  cd(wdDeb)

def rm(*name,t="file"):
  wdDeb="/"+"/".join(fswd)
  for i in name:
    i=path(i)
    cd(wdDeb+i[0])
    if fsdir[1][i[1]][0]==t:
      del fsdir[1][i[1]]
    else:
      print(i[1],"is not a",t)
  cd(wdDeb)

def mv(*args):
  to="/"+args[-1]
  name=list(args);name.pop()
  del args
  wdDeb="/"+"/".join(fswd)
  for i in name:
    i=path(i)
    cd(wdDeb+i[0])
    if to in fsdir[1]:
      mvData=fsdir[1][i[1]]
      del fsdir[1][i[1]]
      cd(wdDeb+to)
      fsdir[1][i[1]]=mvData
    else:
      mvData=fsdir[1][i[1]]
      del fsdir[1][i[1]]
      fsdir[1][to[1:len(to)]]=mvData
      
  cd(wdDeb)

def rmdir(*name):
  rm(*name,t="folder")

def cat(w="",file=""):
  if file=="":
    file=w;w=""
  
  wdDeb="/"+"/".join(fswd)
  file=path(file)
  cd(wdDeb+file[0])
  if fsdir[1][file[1]][0]=="file":
    if w=="":#aff
      print(fsdir[1][file[1]][1])
    elif w==">":#write
      fsdir[1][file[1]][1]=""
      vartest=True
      while vartest:
        try:
          line=input()
          fsdir[1][file[1]][1]+=line+"\n"
        except:
          vartest=False
  else:
    print(file[1],"is not a file")
  cd(wdDeb)


#creation des repertoires
mkdir("Desktop","Documents","Musique","Videos","Images","Documents/Ma_mission")
touch("Documents/Ma_mission/Mission.txt")
fsdir[1]["Documents"][1]["Ma_mission"][1]["Mission.txt"][1]="Vous avez une mission:\nVous devez parvenir a afficher dans le terminal, de la ou ils sont enregistres, le nom utilisateur de l administrateur ainsi que son mot de passe.\nPour ce faire, vous n avez droit qu a 6 instructions maximum et vous pouvez bien sur aller voir dans le code."