Pat Beirne
83857b5571
-shorten variable names (for size) -simplify sed() command scan -sed backup extension includes the . dot now -add extended commands in tf_extend.py
239 lines
6.8 KiB
Python
Executable File
239 lines
6.8 KiB
Python
Executable File
# tf Text File manipulations
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# for micropython and other tiny environments
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# (c) Pat Beirne patb@pbeirne.com
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import re,os,sys,gc
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# ====legend====
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# e=end
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# f=input file
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# g=output file
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# i=iteration variable
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# m=line range
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# r=replace text
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# s=start/search/string
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# sp=search regex
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def transfer(src,dest,first=1,last=0xFFFFFFFF,numbers=False,grep_func=None):
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#src is a filename, dst is a handle
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i=0
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try:
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with open(src) as f:
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for lin in f:
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i=i+1
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if i<first or i>last:
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continue
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if grep_func and not grep_func(lin):
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continue
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if numbers:
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dest.write(str(i)+' ')
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dest.write(lin)
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except:
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print("could not open file {}".format(src))
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def cp(src,dest):
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try:
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with open(dest,'w') as g:
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transfer(src,g)
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except:
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print("could not write to file {}".format(dest))
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def grep(filename, pattern, numbers=False):
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m=re.compile(pattern)
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if not m:
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print("grep() called with invalid pattern")
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return
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transfer(filename,sys.stdout,numbers=numbers,grep_func=(lambda x:m.search(x)))
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def cat(filename, first=1, last=1000000, numbers=False, title=True):
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if title:
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print("===={}=====".format(filename))
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transfer(filename,sys.stdout,first,last,numbers=numbers)
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def sed(filename, sed_cmd, bak_ext=".bak"):
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# parse the sed_cmd
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# group 1,3 are the n-start, n-end group 4 is command: aidsxX
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a=re.search("^(\d*)([,-](\d+|\$))?\s*([sdaixX].*)",sed_cmd)
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if not a:
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print("sed() failed; 2nd argument must be a number-range followed by one of sdaixX; no changes applied")
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return
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cmd=a.group(4)
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s,e=(1,1000000)
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if a.group(1):
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s=e=int(a.group(1))
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if a.group(3):
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e=1000000 if a.group(3)=='$' else int(a.group(3))
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op=cmd[0]
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if op not in "sdiaxX":
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print("sed requires an operation, one of 's,d,i,a,x or X'")
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return
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#print("sed command parser of <{}> returned {} {} {} {}".format(cmd,sr,de,ins,add))
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if op in "sxX":
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if len(cmd)<2:
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print("invalid sed argument")
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return
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dl=cmd[1]
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if op=='s':
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gs=re.search("s"+dl+"([^"+dl+"]*)"+dl+"([^"+dl+"]*)"+dl,cmd)
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else:
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gs=re.search("[xX]"+dl+"([^"+dl+"]*)"+dl,cmd)
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if not gs:
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print("invalid sed search pattern")
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return 0,0
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if op=='s':
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ss,r = gs.group(1),gs.group(2)
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#print("search <{}> and replace <{}>".format(s,r))
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else:
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ss=gs.group(1)
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#print("search <{}>".format(s))
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sp=re.compile(ss)
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extra=a.group(4)[1:] + '\n'
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try:
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os.rename(filename,filename+bak_ext)
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except:
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print("problem with filename; backup failed; no changes made")
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return
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i=h=0
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try:
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with open(filename+bak_ext) as f:
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with open(filename,'w') as g:
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for lin in f:
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i=i+1
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m=(i>=s and i<=e)
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if op=='s' and m:
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lin=lin[:-1]
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if sp.search(lin): h+=1
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lin=sp.sub(r,lin)+'\n'
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if op=='d' and m:
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h+=1
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continue # delete line
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if op=='i' and m:
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#print("insert a line before {} <{}>".format(i,extra))
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g.write(extra)
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h+=1
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if op in "aids":
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g.write(lin)
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elif m and (op=='x' if sp.search(lin) else op=='X'):
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g.write(lin)
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h+=1
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if op=='a' and m:
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#print("append a line after {} <{}>".format(i,extra))
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g.write(extra)
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h+=1
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#f.write("--file modifed by sed()--\n")
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except OSError:
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print("problem opening file {}".format(filename))
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except RuntimeError:
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print("problem with the regex; try a different pattern")
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return (i, h)
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def _dir(d='.'):
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try:
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for f in os.listdir(d):
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s=os.stat(d+'/'+f)
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print("{}rwx all {:9d} {}".format('d' if (s[0] & 0x4000) else '-',s[6],f))
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except:
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print("not a valid directory")
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s=os.statvfs('/')
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print("disk size:{:8d} KB disk free: {} KB".format(s[0]*s[2]//1024,s[0]*s[3]//1024))
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'''-----cut here if you only need the functions-----'''
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def ext_cmd(a):
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return
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if 'tf_extend.py' in os.listdir():
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import tf_extend
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ext_cmd=tf_extend.cmd
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def _help():
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print("==Simple shell v1.1")
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print(" cp/copy <src-file> <dest-file>")
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print(" mv/move <src-file> <dest-file> \t\trm/del <file>")
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print(" cd [<folder>] mkdir <folder>\t\trmdir <folder>")
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print(" dir/ls [<folder>]")
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print(" cat/list [-n] [-l <n>,<m>] <file>")
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print(" grep <pattern> <file>")
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print(" sed <pattern> <file>")
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print(" pattern is '<line-range><op><extra>' e.g'a/search/replace/', 'x!TODO:!', '43,49d', '8itext'")
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print(" patterns with spaces require single-quotes sed ops are one of s/d/i/a/x/X")
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print(" sed does not work across line boundaries sed s/x/X-patterns: non-/ delimiters are allowed")
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print("file names must NOT have embedded spaces options must be early on the command line")
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ext_cmd('help')
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def parseQuotedArgs(st):
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if st[0]=="'":
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p=re.search("'((\'|[^'])*)'",st)
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if not p:
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print("quoted pattern error")
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return ""
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return p.group(1)
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else:
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return st.split()[0]
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def main():
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print("Simple shell: cp/copy mv/move rm/del cat/list cd dir/ls mkdir rmdir grep sed help")
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while 1:
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numbers=False
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r=input(os.getcwd()+"$ ")
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rp=r.split()
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if not len(rp): continue
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op=rp[0]
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if op in ('dir','ls'):
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_dir(rp[1] if len(rp)>1 else '.')
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elif op in ('cat','list'):
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n=(" -n " in r) #print line-nums
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s,e=1,1000000 #start/end
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g=re.search("\s(-l\s*(\d+)([-,](\d+|\$)?)?)\s+",r[3:])
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if g:
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s=e=int(g.group(2))
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if g.group(3):
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e=int(g.group(4)) if g.group(4) and g.group(4).isdigit() else 1000000
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cat(rp[-1],s,e,numbers=n)
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elif op=='grep':
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if len(rp)<3:
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print("grep pattern filename")
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continue
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grep(rp[-1],parseQuotedArgs(r[5:]),numbers=True)
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elif op=='sed':
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if len(rp)<3:
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print("sed pattern filename")
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continue
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r=sed(rp[-1],parseQuotedArgs(r[4:]))
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if r:
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print("Lines processed: {} Lines modifed: {}".format(*r))
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elif op=='cd':
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os.chdir(rp[1] if len(rp)>1 else '/')
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elif op=='help':
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_help()
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ext_cmd(rp)
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elif ext_cmd(rp):
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pass
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else:
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try:
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if op in ('cp','copy'):
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cp(rp[1],rp[2])
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elif op=='mkdir':
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os.mkdir(rp[1])
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elif op=='rmdir':
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os.rmdir(rp[1])
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elif op in('mv','move'):
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os.rename(rp[1],rp[2])
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elif op in('rm','del'):
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os.remove(rp[1])
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else:
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print("command not implemented")
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except IndexError:
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print("not enough argments; check syntax with 'help'")
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except OSError:
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print("file not found")
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gc.collect()
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if __name__=="tf":
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print("tf module loaded; members cp(), cat(), cd(), _dir(), grep() and sed()")
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main()
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