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authorPetr Baudis <pasky@suse.cz>2006-06-24 02:34:47 (GMT)
committerJunio C Hamano <junkio@cox.net>2006-07-03 00:14:41 (GMT)
commitd79850e1fd22abd44e447214a64e5a774ada311e (patch)
tree3777a737600fa2e05ff33e51e31a8f0013566395 /perl
parent8b9150e3e3cc6bf78b21b2e01dcc5e3ed45597a4 (diff)
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Git.pm: Enhance the command_pipe() mechanism
Rename command_pipe() to command_output_pipe(), outsource the functionality to _command_common_pipe(). Add command_input_pipe(). Signed-off-by: Petr Baudis <pasky@suse.cz> Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'perl')
-rw-r--r--perl/Git.pm76
1 files changed, 53 insertions, 23 deletions
diff --git a/perl/Git.pm b/perl/Git.pm
index 4205ac5..11ec62d 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -32,7 +32,7 @@ $VERSION = '0.01';
my @revs = $repo->command('rev-list', '--since=last monday', '--all');
- my ($fh, $c) = $repo->command_pipe('rev-list', '--since=last monday', '--all');
+ my ($fh, $c) = $repo->command_output_pipe('rev-list', '--since=last monday', '--all');
my $lastrev = <$fh>; chomp $lastrev;
$repo->command_close_pipe($fh, $c);
@@ -48,7 +48,8 @@ require Exporter;
@EXPORT = qw(git_cmd_try);
# Methods which can be called as standalone functions as well:
-@EXPORT_OK = qw(command command_oneline command_pipe command_noisy
+@EXPORT_OK = qw(command command_oneline command_noisy
+ command_output_pipe command_input_pipe command_close_pipe
version exec_path hash_object git_cmd_try);
@@ -194,7 +195,7 @@ In both cases, the command's stdin and stderr are the same as the caller's.
=cut
sub command {
- my ($fh, $ctx) = command_pipe(@_);
+ my ($fh, $ctx) = command_output_pipe(@_);
if (not defined wantarray) {
# Nothing to pepper the possible exception with.
@@ -237,7 +238,7 @@ of the command's standard output.
=cut
sub command_oneline {
- my ($fh, $ctx) = command_pipe(@_);
+ my ($fh, $ctx) = command_output_pipe(@_);
my $line = <$fh>;
chomp $line;
@@ -253,40 +254,49 @@ sub command_oneline {
}
-=item command_pipe ( COMMAND [, ARGUMENTS... ] )
+=item command_output_pipe ( COMMAND [, ARGUMENTS... ] )
Execute the given C<COMMAND> in the same way as command()
does but return a pipe filehandle from which the command output can be
read.
+The function can return C<($pipe, $ctx)> in array context.
+See C<command_close_pipe()> for details.
+
=cut
-sub command_pipe {
- my ($self, $cmd, @args) = _maybe_self(@_);
+sub command_output_pipe {
+ _command_common_pipe('-|', @_);
+}
- $cmd =~ /^[a-z0-9A-Z_-]+$/ or throw Error::Simple("bad command: $cmd");
- my $pid = open(my $fh, "-|");
- if (not defined $pid) {
- throw Error::Simple("open failed: $!");
- } elsif ($pid == 0) {
- _cmd_exec($self, $cmd, @args);
- }
- return wantarray ? ($fh, join(' ', $cmd, @args)) : $fh;
+=item command_input_pipe ( COMMAND [, ARGUMENTS... ] )
+
+Execute the given C<COMMAND> in the same way as command_output_pipe()
+does but return an input pipe filehandle instead; the command output
+is not captured.
+
+The function can return C<($pipe, $ctx)> in array context.
+See C<command_close_pipe()> for details.
+
+=cut
+
+sub command_input_pipe {
+ _command_common_pipe('|-', @_);
}
=item command_close_pipe ( PIPE [, CTX ] )
-Close the C<PIPE> as returned from C<command_pipe()>, checking
+Close the C<PIPE> as returned from C<command_*_pipe()>, checking
whether the command finished successfuly. The optional C<CTX> argument
is required if you want to see the command name in the error message,
-and it is the second value returned by C<command_pipe()> when
+and it is the second value returned by C<command_*_pipe()> when
called in array context. The call idiom is:
- my ($fh, $ctx) = $r->command_pipe('status');
- while (<$fh>) { ... }
- $r->command_close_pipe($fh, $ctx);
+ my ($fh, $ctx) = $r->command_output_pipe('status');
+ while (<$fh>) { ... }
+ $r->command_close_pipe($fh, $ctx);
Note that you should not rely on whatever actually is in C<CTX>;
currently it is simply the command name but in future the context might
@@ -317,8 +327,7 @@ The function returns only after the command has finished running.
sub command_noisy {
my ($self, $cmd, @args) = _maybe_self(@_);
-
- $cmd =~ /^[a-z0-9A-Z_-]+$/ or throw Error::Simple("bad command: $cmd");
+ _check_valid_cmd($cmd);
my $pid = fork;
if (not defined $pid) {
@@ -404,7 +413,7 @@ string with the captured command output (depending on the original function
call context; C<command_noisy()> returns C<undef>) and $<cmdline> which
returns the command and its arguments (but without proper quoting).
-Note that the C<command_pipe()> function cannot throw this exception since
+Note that the C<command_*_pipe()> functions cannot throw this exception since
it has no idea whether the command failed or not. You will only find out
at the time you C<close> the pipe; if you want to have that automated,
use C<command_close_pipe()>, which can throw the exception.
@@ -516,6 +525,27 @@ sub _maybe_self {
ref $_[0] eq 'Git' ? @_ : (undef, @_);
}
+# Check if the command id is something reasonable.
+sub _check_valid_cmd {
+ my ($cmd) = @_;
+ $cmd =~ /^[a-z0-9A-Z_-]+$/ or throw Error::Simple("bad command: $cmd");
+}
+
+# Common backend for the pipe creators.
+sub _command_common_pipe {
+ my $direction = shift;
+ my ($self, $cmd, @args) = _maybe_self(@_);
+ _check_valid_cmd($cmd);
+
+ my $pid = open(my $fh, $direction);
+ if (not defined $pid) {
+ throw Error::Simple("open failed: $!");
+ } elsif ($pid == 0) {
+ _cmd_exec($self, $cmd, @args);
+ }
+ return wantarray ? ($fh, join(' ', $cmd, @args)) : $fh;
+}
+
# When already in the subprocess, set up the appropriate state
# for the given repository and execute the git command.
sub _cmd_exec {