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graph: add support for --line-prefix on all graph-aware output

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Add an extension to git-diff and git-log (and any other graph-aware
displayable output) such that "--line-prefix=<string>" will print the
additional line-prefix on every line of output.

To make this work, we have to fix a few bugs in the graph API that force
graph_show_commit_msg to be used only when you have a valid graph.
Additionally, we extend the default_diff_output_prefix handler to work
even when no graph is enabled.

This is somewhat of a hack on top of the graph API, but I think it
should be acceptable here.

This will be used by a future extension of submodule display which
displays the submodule diff as the actual diff between the pre and post
commit in the submodule project.

Add some tests for both git-log and git-diff to ensure that the prefix
is honored correctly.

Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jacob Keller
2016-08-31 16:27:20 -07:00
committed by Junio C Hamano
parent cd48dadb8d
commit 660e113ce1
11 changed files with 502 additions and 78 deletions
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7
diff.c
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@ -18,6 +18,7 @@
#include "ll-merge.h"
#include "string-list.h"
#include "argv-array.h"
#include "graph.h"
#ifdef NO_FAST_WORKING_DIRECTORY
#define FAST_WORKING_DIRECTORY 0
@ -3966,6 +3967,12 @@ int diff_opt_parse(struct diff_options *options,
options->a_prefix = optarg;
return argcount;
}
else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
options->line_prefix = optarg;
options->line_prefix_length = strlen(options->line_prefix);
graph_setup_line_prefix(options);
return argcount;
}
else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
options->b_prefix = optarg;
return argcount;