Git输出格式——Git placeholders

git的输出格式，可以极大的方便我们处理输出字符串
最好的还是查看官方手册，虽然长，但有用！

http://www.kernel.org/pub/software/scm/git/docs/git-show.html

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The placeholders are:

%H: commit hash

%h: abbreviated commit hash

%T: tree hash

%t: abbreviated tree hash

%P: parent hashes

%p: abbreviated parent hashes

%an: author name

%aN: author name (respecting .mailmap, see git-shortlog(1) or git-blame(1))

%ae: author email

%aE: author email (respecting .mailmap, see git-shortlog(1) or git-blame(1))

%ad: author date (format respects --date= option)

%aD: author date, RFC2822 style

%ar: author date, relative

%at: author date, UNIX timestamp

%ai: author date, ISO 8601 format

%cn: committer name

%cN: committer name (respecting .mailmap, see git-shortlog(1) or git-blame(1))

%ce: committer email

%cE: committer email (respecting .mailmap, see git-shortlog(1) or git-blame(1))

%cd: committer date

%cD: committer date, RFC2822 style

%cr: committer date, relative

%ct: committer date, UNIX timestamp

%ci: committer date, ISO 8601 format

%d: ref names, like the --decorate option of git-log(1)

%e: encoding

%s: subject

%f: sanitized subject line, suitable for a filename

%b: body

%B: raw body (unwrapped subject and body)

%N: commit notes

%gD: reflog selector, e.g., refs/stash@{1}

%gd: shortened reflog selector, e.g., stash@{1}

%gn: reflog identity name

%gN: reflog identity name (respecting .mailmap, see git-shortlog(1) or git-blame(1))

%ge: reflog identity email

%gE: reflog identity email (respecting .mailmap, see git-shortlog(1) or git-blame(1))

%gs: reflog subject

%Cred: switch color to red

%Cgreen: switch color to green

%Cblue: switch color to blue

%Creset: reset color

%C(…): color specification, as described in color.branch.* config option

%m: left, right or boundary mark

%n: newline

%%: a raw %

%x00: print a byte from a hex code

%w([[,[,]]]): switch line wrapping, like the -w option of git-shortlog(1).
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