初学 go 也写一个 getopt.go 实现

yjh777

see: https://github.com/tcler/cmdline-go

用法:

1. git clone https://github.com/tcler/cmdline-go
   
2. cd cmdline-go
   
3. 
   
4. go get -u github.com/tcler/cmdline-go/cmdline
   
5. go run main_cmdline.go -h -H -f file --file file2 -e 's/abc/xyz/'  -r -n  -s=A -oa=b -S ''  -i -x xfile --wenj=file3 --www -aa -vvv -S DD -- -0 -y
   

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yjh777

1. $ go run main_cmdline.go -h -H -f file --file file2 -e 's/abc/xyz/'  -r -n  -s=A -oa=b -S ''  -i -x xfile --wenj=file3 --www -aa -vvv -S DD -- -0 -y
   
2. Debug info:
   
3. --------------------------------------------------------------------------------
   
4. [-h -H -f file --file file2 -e s/abc/xyz/ -r -n -s=A -oa=b -S  -i -x xfile --wenj=file3 --www -aa -vvv -S DD -- -0 -y]
   
5. Options group1:
   
6.      -h -H --help              out put the usage info
   
7.      -f -F --file {arg}        file to be parse
   
8.      -o [arg]                  mount option
   
9.      -v                        verbose output, -vvv means verbose level 3
   
10.      -x <arg>                  dump binary file to text
    
11.      -s <arg>                  enable smart mode
    
12. 
    
13. Options group2:
    
14.      -e {arg}                  sed -e option, will forward to child sed process
    
15.      -r                        sed -r option, will forward to child sed process
    
16.      -n                        sed -n option, will forward to child sed process
    
17. 
    
18. Comments:
    
19.     *  [arg] means arg is optional, need use --opt=arg to specify an argument
    
20.        <arg> means arg is required, and -f a -f b will get the latest 'b'
    
21.        {arg} means arg is required, and -f a -f b will get a list 'a b'
    
22. 
    
23.     *  if arg is required, '--opt arg' is same as '--opt=arg'
    
24. 
    
25.     *  '-opt' will be treated as:
    
26.            '--opt'    if 'opt' is defined;
    
27.            '-o -p -t' if 'opt' is undefined;
    
28.            '-o -p=t'  if 'opt' is undefined and '-p' need an argument;
    
29. 
    
30. opt(help) = []string{"set", "set"}
    
31. opt(f) = []string{"file", "file2", "file3"}
    
32. opt(s) = []string{"DD", "", "A"}
    
33. opt(x) = []string{"xfile"}
    
34. opt(v) = []string{"set", "set", "set"}
    
35. opt(h) = []string{"set", "set"}
    
36. opt(H) = []string{"set", "set"}
    
37. opt(o) = []string{"a=b"}
    
38. opt(F) = []string{"file", "file2", "file3"}
    
39. opt(file) = []string{"file", "file2", "file3"}
    
40. 
    
41. option: 'i' undefined
    
42. option: 'www' undefined
    
43. option: 'a' undefined
    
44. option: 'a' undefined
    
45. 
    
46. params: []string{"-0", "-y"}
    
47. forward: []string{"-e s/abc/xyz/", "-r", "-n"}
    
48. --------------------------------------------------------------------------------
    
49. Usage: ...
    
50. file list: []string{"file", "file2", "file3"}
    
51. verbose level: 3
    
52. smart mode: "DD"
    

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