Git：git grepコマンドでディレクトリの深さを指定して検索する方法

git grepコマンドでディレクトリの深さを指定して検索する方法

git grepコマンドでディレクトリの深さを指定して検索するには--max-depthオプションを指定します。

オプションの説明

 --max-depth <depth>
     For each <pathspec> given on command line, descend at most <depth> levels of directories. A value of -1 means no limit. This option is ignored if
     <pathspec> contains active wildcards. In other words if "a*" matches a directory named "a*", "*" is matched literally so --max-depth is still effective.

--max-depthオプションを指定した場合（0はディレクトリを再帰的に検索しない。デフォルトは-1でディレクトリを再帰的に検索する）

$ git grep --max-depth 0 time_t | head
archive-zip.c: time_t time;
archive-zip.c: time = (time_t)*timestamp;
archive.c: time_t archive_time;
blame.c: time_t now;
commit-graph.c: time_t now = time(NULL);
commit-reach.c: time_t min_commit_date,
commit-reach.c: time_t min_commit_date = cutoff_by_min_date ? from->item->date : 0;
commit-reach.h: time_t min_commit_date,
date.c:static time_t tm_to_time_t(const struct tm *tm)
date.c:static time_t gm_time_t(timestamp_t time, int tz)

$ git grep --max-depth 1 time_t | head
Documentation/git-grep.txt:`git grep 'time_t' -- '*.[ch]'`::
Documentation/git-grep.txt: Looks for `time_t` in all tracked .c and .h files in the working
archive-zip.c: time_t time;
archive-zip.c: time = (time_t)*timestamp;
archive.c: time_t archive_time;
blame.c: time_t now;
builtin/bugreport.c: time_t now = time(NULL);
builtin/pack-objects.c: time_t last_mtime = 0;
commit-graph.c: time_t now = time(NULL);
commit-reach.c: time_t min_commit_date,

$ git grep --max-depth 2 time_t | head
Documentation/RelNotes/2.14.0.txt: * Some platforms have ulong that is smaller than time_t, and our
Documentation/git-grep.txt:`git grep 'time_t' -- '*.[ch]'`::
Documentation/git-grep.txt: Looks for `time_t` in all tracked .c and .h files in the working
archive-zip.c: time_t time;
archive-zip.c: time = (time_t)*timestamp;
archive.c: time_t archive_time;
blame.c: time_t now;
builtin/bugreport.c: time_t now = time(NULL);
builtin/pack-objects.c: time_t last_mtime = 0;
commit-graph.c: time_t now = time(NULL);

--max-depthオプションを指定しない場合

$ git grep -n time_t | head
Documentation/RelNotes/2.14.0.txt:141: * Some platforms have ulong that is smaller than time_t, and our
Documentation/git-grep.txt:308:`git grep 'time_t' -- '*.[ch]'`::
Documentation/git-grep.txt:309: Looks for `time_t` in all tracked .c and .h files in the working
archive-zip.c:599:      time_t time;
archive-zip.c:605:      time = (time_t)*timestamp;
archive.c:438:  time_t archive_time;
blame.c:187:    time_t now;
builtin/bugreport.c:127:        time_t now = time(NULL);
builtin/pack-objects.c:1164:    time_t last_mtime = 0;
commit-graph.c:2187:    time_t now = time(NULL);