问题描述
我正在尝试比较两个汇编文件，其中一个用大写字母写，另一个用小写字母写.直到大小写和空白为止，许多行都是相同的.
I am trying to compare two assembly files where one was written all caps and the other in lowercase. Many lines are identical up to case and whitespace.
我尝试了以下操作，而两个缓冲区处于差异模式:
I tried the following, while two buffers in diff mode:
:set diffopt+=icase
:set diffopt+=iwhite
:diffupdate
空白事物似乎工作良好，但忽略大小写则无法正常工作.例如，在以下两行中:
The whitespace thing seems to work well, but the ignore case does not do its work. For example, in the following two lines:
I0=R0; // ADDRESS OF INPUT ARRAY
i0 = r0; // address of input array
[第一行以12个空格开头，第二行以单个制表符]
[the first line begins with 12 spaces, the second with a single tab]
为什么?我该怎么办?
更新:只是注意到这两行中的所有差异都被忽略了，好吧:
UPDATE: just noticed that in these two lines all differences were ignored OK:
// MULTIPLY R1 BY 4 TO FETCH DATA OF WORD LENGTH
// multiply r1 by 4 to fetch data of word length
推荐答案
您的比较失败的原因是空格，而不是大小写.发生这种情况的原因是，当您使用iwhite选项时，在后台，vimdiff正在执行diff -b，这比起您要查找的内容对空白比较方式的限制更多.更具体地说，-b选项仅忽略空白处已经存在空白处的差异.在您的示例中，i0 = r0;被标记为与I0=R0;不同，因为一个字符之间包含空格，而另一个字符之间不包含空格.
Your comparison is failing because of the whitespace, not because of the case. This is happening because when you use the iwhite option, in the background, vimdiff is executing a diff -b which is more restrictive about how it compares whitespace than what you're looking for. More specifically, the -b option only ignores differences in the amount of whitespace where there already is whitespace. In your example, i0 = r0; is being flagged as different than I0=R0; because one contains whitespace between the characters and the other doesn't.
根据vimdiff文档，可以通过将diffexpr设置为非空值来覆盖iwhite选项的默认行为.您感兴趣的diff标志是--ignore-all-space，它在空白方面更加灵活.您可以在vimdiff中将diffexpr更改为使用此选项，而不是默认的-b选项，如下所示:
According to the vimdiff documentation, you can override the default behavior of the iwhite option by setting diffexpr to a non-empty value. The diff flag that you're interested in is --ignore-all-space, which is more flexible about whitespace. You can change the diffexpr in vimdiff to use this option instead of the default -b option as follows:
set diffexpr=MyDiff()
function MyDiff()
let opt = ""
if &diffopt =~ "icase"
let opt = opt . "-i "
endif
if &diffopt =~ "iwhite"
let opt = opt . "--ignore-all-space "
endif
silent execute "!diff -a --binary " . opt . v:fname_in . " " . v:fname_new .
\ " > " . v:fname_out
endfunction
有关更多详细信息，请参阅文档:
See the documentation for more details:
http://vimdoc.sourceforge.net/htmldoc/options.html #％27diffopt％27
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