Re: [RFC PATCH 3/3] format-patch: use a command to generate the output directory name

2019-10-02 Thread Junio C Hamano
Bert Wesarg  writes:

> Having 'format.outputDirectory' is convenient, but being able to process
> all produced patches via a wildcard command is even more so. I.e.,
> using an argument like '/*'. Neither '-o' nor
> 'format.outputDirectory' can be parameterized to produce a new unique
> directory. Thus provide the new 'format.outputDirectoryCmd' configuration
> to specify a command which does the job and puts the name to standard
> output.
>

The above does not interest me (a reader) enough, without the log
message explaining why

git format-patch -o "$(outdircmd)"

is not sufficient.

Thanks.


[RFC PATCH 3/3] format-patch: use a command to generate the output directory name

2019-10-02 Thread Bert Wesarg
Having 'format.outputDirectory' is convenient, but being able to process
all produced patches via a wildcard command is even more so. I.e.,
using an argument like '/*'. Neither '-o' nor
'format.outputDirectory' can be parameterized to produce a new unique
directory. Thus provide the new 'format.outputDirectoryCmd' configuration
to specify a command which does the job and puts the name to standard
output.

Signed-off-by: Bert Wesarg 

---
Cc: Alexander Kuleshov 
Cc: Eric Sunshine 
---
 Documentation/config/format.txt|  5 +
 Documentation/git-format-patch.txt |  6 +-
 builtin/log.c  | 24 +++-
 t/t4014-format-patch.sh| 24 
 4 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/Documentation/config/format.txt b/Documentation/config/format.txt
index b6c96ece04..dcce2c67ef 100644
--- a/Documentation/config/format.txt
+++ b/Documentation/config/format.txt
@@ -82,6 +82,11 @@ format.outputDirectory::
Set a custom directory to store the resulting files instead of the
current working directory. All directory components will be created.
 
+format.outputDirectoryCmd::
+   The command which is used to name a custom directory to store the
+   resulting files instead of the current working directory. All directory
+   components will be created.
+
 format.useAutoBase::
A boolean value which lets you enable the `--base=auto` option of
format-patch by default.
diff --git a/Documentation/git-format-patch.txt 
b/Documentation/git-format-patch.txt
index f418f490aa..0da904255b 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -67,7 +67,11 @@ can be set with the `format.outputDirectory` configuration 
option.
 The `-o` option takes precedence over `format.outputDirectory`.
 To store patches in the current working directory even when
 `format.outputDirectory` points elsewhere, use `-o .`. All directory
-components will be created.
+components will be created. The 'format.outputDirectoryCmd' configuration can
+be used to name a command to produce the directory name programmatically. The
+command should produce the name to its standard output. The
+`format.outputDirectory` configuration takes precedence over
+`format.outputDirectoryCmd`.
 
 By default, the subject of a single patch is "[PATCH] " followed by
 the concatenation of lines from the commit message up to the first blank
diff --git a/builtin/log.c b/builtin/log.c
index 1ab9eb6b78..b102e86bea 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -774,6 +774,7 @@ static const char *signature = git_version_string;
 static const char *signature_file;
 static int config_cover_letter;
 static const char *config_output_directory;
+static const char *config_output_directory_cmd;
 
 enum {
COVER_UNSET,
@@ -856,6 +857,8 @@ static int git_format_config(const char *var, const char 
*value, void *cb)
}
if (!strcmp(var, "format.outputdirectory"))
return git_config_string(&config_output_directory, var, value);
+   if (!strcmp(var, "format.outputdirectorycmd"))
+   return git_config_string(&config_output_directory_cmd, var, 
value);
if (!strcmp(var, "format.useautobase")) {
base_auto = git_config_bool(var, value);
return 0;
@@ -1756,8 +1759,27 @@ int cmd_format_patch(int argc, const char **argv, const 
char *prefix)
if (rev.show_notes)
init_display_notes(&rev.notes_opt);
 
-   if (!output_directory && !use_stdout)
+   if (!output_directory && !use_stdout) {
+   // outputDirectoryCmd can be preceeded by outputDirectory
+   if (!config_output_directory && config_output_directory_cmd) {
+   struct child_process cp = CHILD_PROCESS_INIT;
+   const char *argv[1];
+   struct strbuf buf = STRBUF_INIT;
+   int rc;
+
+   argv[0] = config_output_directory_cmd;
+   cp.argv = argv;
+   cp.use_shell = 1;
+   rc = capture_command(&cp, &buf, PATH_MAX);
+   if (rc)
+   die(_("outputDirectoryCmd command failed: "
+ "'%s'"), config_output_directory_cmd);
+   strbuf_setlen(&buf, strcspn(buf.buf, "\r\n"));
+   config_output_directory = strbuf_detach(&buf, NULL);
+   }
+
output_directory = config_output_directory;
+   }
 
if (!use_stdout)
output_directory = set_outdir(prefix, output_directory);
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 43d608aa94..bf2547ce87 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1664,6 +1664,30 @@ test_expect_success 'format-patch -o overrides 
format.outputDirectory' '