VIM TIP32

compare to C and shell(bash), herein is some vim specifics about vim-script: 相对于C和shell（bash）编程，这里有些vim脚本的细节要注意： 1. A function name must be capitalized. 1. 函数名必须大写 hex2dec is invalid Hex2dec is valid hex2dex是非法的 Hex2dec是合法的 while in c and shell(bash), both lowercase and uppercase is allowed. 但是在C或bash shell中，无论大小写都是可以的。 2. how to reference the parameters 2.如何传递参数

fu! Hex2dec(var1, var2) let str=a:var1 let str2=a:var2

you must prefix the parameter name with "a:", and a:var1 itself is read-only 你必须在参数前加前缀a:，并且a:var1是只读的 in c, you reference the parameter directly and the parameter is writable. 在C中，你直接调用参数并且参数是可读的 3. how to implement variable parameter 3. 如何执行变量

fu! Hex2dec(fixpara, ...)

a:0 is the real number of the variable parameter when you invoke the function, with :Hex2dec("asdf", 4,5,6), a:0=3, and a:1=4 a:2=5 a:3=6 当调用函数，a:0 是实数变量 you can combine "a:" and the number to get the value 你可以混合“a:"和数字来取得函数值

while i exe "let num=a:".i let i=i+1 endwhile

in c, the function get the real number by checking the additional parameter such as printf family, or by checking the special value such as NULL c中，函数取值是通过检验额外得参数比如printf族，或者检测特定得值是否为空 4. where is the vim-library 4.vim的库在哪？ yes, vim has its own function-library, just like .a in c :help functions 是的，vim有它自己的函数库，就像c语言中的.a文件 :help functions 5. can I use += or ++ operator? 5.我可以使用+=或者++这样的操作符吗？ Nop, += and ++ (and -=, -- and so on)operator gone away in vim. 遗憾的是vim没有类似+=和＋＋这样的操作符（-=,--这些也是） 6. How can I assign a value to a variables and fetch its value? 6.如何分配变量置并取取其值呢？

let var_Name=value let var1=var2

like it does in c, except you must use let keyword 除了必须用关键字let以外，就像在c中做的一样。 7. Can I use any ex-mode command in a function? 7. 我可以在ex模式下调用函数吗？ As I know, yes, just use it directly, as if every line you type appears in the familar : 据我所知，是的，可以直接用，就像每行都是你在熟悉的：后输入的一样 8. Can I call a function recurse? 8. 可以使用递归调用吗？ Yes, but use it carefully to avoid infinte call. 可以，但是要小心，避免无穷调用！ 9. Can I call another function in a function? 9. 可以在函数中调用函数吗？ Course, like C does. 当然，就像C一样 10. Must I compile the function? 10. 我必须编译函数吗？ No, you needn't and you can't, just :so script_name, after this you can call the function freely. 不，你没必要也不能，仅仅:so script_name，之后就可以自由调用该函数了 11. Is it has integer and char or float data type? 11. 有整型，字符，浮点这样的数据类型吗？ No, like perl, vim script justify the variable type depend upon the context 没有，就像perl，vim脚本自动根据变量值调整变量类型

:let a=1 :let a=a."asdf" :echo a

you'll get

1asdf'
  将得到 </a>

1asdf'

:let a=1 :let a=a+2 :echo a

you'll get 3 将得到 3 But it differs from perl. 但是它和perl有区别 12. Must I append a

;'</span> in every statement?
  必须在每一句后边加<span style="font-weight:bold;">';'</span>吗？
  No, never do that.
  不，没必要
  ; is required in C, and optional in shell for each statement in a alone line.
  ；在C是必须的，在shell中一行中的每一句是可选的
  But is forbidden in vim.
  但是在vim是禁止的
  if you want combine servals statement in one single line, use <span style="font-weight:bold;">

|'. 如果想在单行里边写多句，使用‘|' Take your mind that every statement appears in function should be valid in ex-mode(except for some special statement). 谨记除少数特殊声明外，函数中每一句都可以在ex模式下合法可用

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