[PATCH v4 01/13] parse-options.h: add new options `--pathspec-from-file`, `--pathspec-file-nul`

From: Alexandr Miloslavskiy via GitGitGadget <gitgitgadget@gmail.com>
Date: Dec 3, 2019, 14:02 UTC
Message-ID: <cca5aee39229d0d54d88c7dae18dafa956473559.1575381738.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.445.v4.git.1575381738.gitgitgadget@gmail.com>

From: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>

Support for various porcelain commands will arrive via additional patches.

`--pathspec-from-file` solves the problem of commandline length limit
for UIs built on top of git. Plumbing commands are not always a good
fit, for two major reasons:
1) Some UIs show executed commands to user. In this case, porcelain
   commands are expected. One reason for that is letting user learn git
   commands by clicking UI buttons. The other reason is letting user
   study the history of commands in case of any unexpected results. Both
   of these will lose most of their value if UI uses combinations of
   arcane plumbing commands.
2) Some UIs have started and grown with porcelain commands. Replacing
   existing logic with plumbing commands could be cumbersome and prone
   to various new problems.

`--pathspec-from-file` will behave very close to pathspec passed in commandline args, so that switching from one to another is simple.

`--pathspec-from-file` will read either a specified file or `stdin` (when file is exactly "-"). Reading from file is a good way to avoid competing for `stdin`, and also gives some extra flexibility.

`--pathspec-file-nul` switch mirrors `-z` already used in various places. Some porcelain commands, such as `git commit`, already use `-z`, therefore it needed a new unambiguous name.

New options do not have shorthands to avoid shorthand conflicts. It is not expected that they will be typed in console.

Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
---
 parse-options.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/parse-options.h b/parse-options.h
index 38a33a087e..c6cc01e715 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -330,5 +330,7 @@ int parse_opt_passthru_argv(const struct option *, const char *, int);
 #define OPT_WITH(v, h) _OPT_CONTAINS_OR_WITH("with", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
 #define OPT_WITHOUT(v, h) _OPT_CONTAINS_OR_WITH("without", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
 #define OPT_CLEANUP(v) OPT_STRING(0, "cleanup", v, N_("mode"), N_("how to strip spaces and #comments from message"))
+#define OPT_PATHSPEC_FROM_FILE(v) OPT_FILENAME(0, "pathspec-from-file", v, N_("read pathspec from file"))
+#define OPT_PATHSPEC_FILE_NUL(v)  OPT_BOOL(0, "pathspec-file-nul", v, N_("with --pathspec-from-file, pathspec elements are separated with NUL character"))
 
 #endif

-- 
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