[PATCH v2] rev-list: support human-readable output for `--disk-usage`

From: Li Linchao <lilinchao@oschina.cn>

The '--disk-usage' option for git-rev-list was introduced in 16950f8384 (rev-list: add --disk-usage option for calculating disk usage, 2021-02-09). This is very useful for people inspect their git repo's objects usage infomation, but the resulting number is quit hard for a human to read.

Teach git rev-list to output a human readable result when using '--disk-usage'.

Signed-off-by: Li Linchao <lilinchao@oschina.cn>
---
    rev-list: support human-readable output for disk-usage
    
    The '--disk-usage' option for git-rev-list was introduced in 16950f8384
    (rev-list: add --disk-usage option for calculating disk usage,
    2021-02-09). This is very useful for people inspect their git repo's
    objects usage infomation, but the result number is quit hard for human
    to read.
    
    Teach git rev-list to output more human readable result when using
    '--disk-usage' to calculate objects disk usage.
    
    Signed-off-by: Li Linchao lilinchao@oschina.cn

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1313%2FCactusinhand%2Fllc%2Fadd-human-readable-option-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1313/Cactusinhand/llc/add-human-readable-option-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1313

Range-diff vs v1:

 1:  7f8a7d3f61d ! 1:  7e34d16efe4 rev-list: support `--human-readable` option when applied `disk-usage`
     @@ Metadata
      Author: Li Linchao <lilinchao@oschina.cn>
      
       ## Commit message ##
     -    rev-list: support `--human-readable` option when applied `disk-usage`
     +    rev-list: support human-readable output for `--disk-usage`
      
          The '--disk-usage' option for git-rev-list was introduced in 16950f8384
          (rev-list: add --disk-usage option for calculating disk usage, 2021-02-09).
          This is very useful for people inspect their git repo's objects usage
     -    infomation, but the result number is quit hard for human to read.
     +    infomation, but the resulting number is quit hard for a human to read.
      
     -    Teach git rev-list to output more human readable result when using
     -    '--disk-usage' to calculate objects disk usage.
     +    Teach git rev-list to output a human readable result when using
     +    '--disk-usage'.
      
          Signed-off-by: Li Linchao <lilinchao@oschina.cn>
      
       ## Documentation/rev-list-options.txt ##
      @@ Documentation/rev-list-options.txt: ifdef::git-rev-list[]
     - 	faster (especially with `--use-bitmap-index`). See the `CAVEATS`
     - 	section in linkgit:git-cat-file[1] for the limitations of what
     - 	"on-disk storage" means.
     -+
     -+-H::
     -+--human-readable::
     -+	Print on-disk objects size in human readable format. This option
     -+	must be combined with `--disk-usage` together.
     - endif::git-rev-list[]
     + 	to `/dev/null` as the output does not have to be formatted.
       
     - --cherry-mark::
     + --disk-usage::
     ++--disk-usage=human::
     + 	Suppress normal output; instead, print the sum of the bytes used
     +-	for on-disk storage by the selected commits or objects. This is
     ++	for on-disk storage by the selected commits or objects.
     ++	When it accepts a value `human`, like: `--disk-usage=human`, this
     ++	means to print objects size in human readable format. This is
     + 	equivalent to piping the output into `git cat-file
     + 	--batch-check='%(objectsize:disk)'`, except that it runs much
     + 	faster (especially with `--use-bitmap-index`). See the `CAVEATS`
      
       ## builtin/rev-list.c ##
     +@@ builtin/rev-list.c: static const char rev_list_usage[] =
     + "    --parents\n"
     + "    --children\n"
     + "    --objects | --objects-edge\n"
     ++"    --disk-usage | --disk-usage=human\n"
     + "    --unpacked\n"
     + "    --header | --pretty\n"
     + "    --[no-]object-names\n"
      @@ builtin/rev-list.c: static int arg_show_object_names = 1;
       
       static int show_disk_usage;
     @@ builtin/rev-list.c: static int try_bitmap_disk_usage(struct rev_info *revs,
       				 int filter_provided_objects)
       {
       	struct bitmap_index *bitmap_git;
     -+	struct strbuf bitmap_size_buf = STRBUF_INIT;
     ++	struct strbuf disk_buf = STRBUF_INIT;
      +	off_t size_from_bitmap;
       
       	if (!show_disk_usage)
     @@ builtin/rev-list.c: static int try_bitmap_disk_usage(struct rev_info *revs,
      -	printf("%"PRIuMAX"\n",
      -	       (uintmax_t)get_disk_usage_from_bitmap(bitmap_git, revs));
      +	size_from_bitmap = get_disk_usage_from_bitmap(bitmap_git, revs);
     -+	if (human_readable) {
     -+		strbuf_humanise_bytes(&bitmap_size_buf, size_from_bitmap);
     -+		printf("%s\n", bitmap_size_buf.buf);
     -+	} else
     -+		printf("%"PRIuMAX"\n", (uintmax_t)size_from_bitmap);
     -+	strbuf_release(&bitmap_size_buf);
     ++	if (human_readable)
     ++		strbuf_humanise_bytes(&disk_buf, size_from_bitmap);
     ++	else
     ++		strbuf_addf(&disk_buf, "%"PRIuMAX"", (uintmax_t)size_from_bitmap);
     ++	puts(disk_buf.buf);
     ++	strbuf_release(&disk_buf);
       	return 0;
       }
       
     -@@ builtin/rev-list.c: int cmd_rev_list(int argc, const char **argv, const char *prefix)
     - {
     - 	struct rev_info revs;
     - 	struct rev_list_info info;
     -+	struct strbuf disk_buf = STRBUF_INIT;
     - 	struct setup_revision_opt s_r_opt = {
     - 		.allow_exclude_promisor_objects = 1,
     - 	};
      @@ builtin/rev-list.c: int cmd_rev_list(int argc, const char **argv, const char *prefix)
       			continue;
       		}
       
     -+		if (!strcmp(arg, "--human-readable") || !strcmp(arg, "-H")) {
     -+			human_readable = 1;
     -+			continue;
     -+		}
     -+
     - 		usage(rev_list_usage);
     +-		if (!strcmp(arg, "--disk-usage")) {
     +-			show_disk_usage = 1;
     +-			info.flags |= REV_LIST_QUIET;
     +-			continue;
     ++		if (skip_prefix(arg, "--disk-usage", &arg)) {
     ++			if (*arg == '=') {
     ++				if (!strcmp(++arg, "human")) {
     ++					human_readable = 1;
     ++					show_disk_usage = 1;
     ++					info.flags |= REV_LIST_QUIET;
     ++					continue;
     ++				} else
     ++					die(_("invalid value for '%s': '%s', try --disk-usage=human"), "--disk-usage", arg);
     ++			} else {
     ++				show_disk_usage = 1;
     ++				info.flags |= REV_LIST_QUIET;
     ++				continue;
     ++			}
     + 		}
       
     - 	}
     -+
     -+	if (!show_disk_usage && human_readable)
     -+		die(_("option '%s' should be used with '%s' together"), "--human-readable/-H", "--disk-usage");
     - 	if (revs.commit_format != CMIT_FMT_USERFORMAT)
     - 		revs.include_header = 1;
     - 	if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
     + 		usage(rev_list_usage);
      @@ builtin/rev-list.c: int cmd_rev_list(int argc, const char **argv, const char *prefix)
       			printf("%d\n", revs.count_left + revs.count_right);
       	}
     @@ builtin/rev-list.c: int cmd_rev_list(int argc, const char **argv, const char *pr
      -	if (show_disk_usage)
      -		printf("%"PRIuMAX"\n", (uintmax_t)total_disk_usage);
      +	if (show_disk_usage) {
     -+		if (human_readable) {
     ++		struct strbuf disk_buf = STRBUF_INIT;
     ++		if (human_readable)
      +			strbuf_humanise_bytes(&disk_buf, total_disk_usage);
     -+			printf("%s\n", disk_buf.buf);
     -+		} else
     -+			printf("%"PRIuMAX"\n", (uintmax_t)total_disk_usage);
     ++		else
     ++			strbuf_addf(&disk_buf, "%"PRIuMAX"", (uintmax_t)total_disk_usage);
     ++		puts(disk_buf.buf);
     ++		strbuf_release(&disk_buf);
      +	}
       
       cleanup:
       	release_revisions(&revs);
     -+	strbuf_release(&disk_buf);
     - 	return ret;
     - }
      
       ## t/t6115-rev-list-du.sh ##
      @@ t/t6115-rev-list-du.sh: check_du HEAD
       check_du --objects HEAD
       check_du --objects HEAD^..HEAD
       
     -+
     -+test_expect_success 'rev-list --disk-usage with --human-readable' '
     -+	git rev-list --objects HEAD --disk-usage --human-readable >actual &&
     -+	test_i18ngrep -e "446 bytes" actual
     ++# As mentioned above, don't use hardcode sizes as actual size, but use the
     ++# output from git cat-file.
     ++test_expect_success 'rev-list --disk-usage=human' '
     ++	git rev-list --objects HEAD --disk-usage=human >actual &&
     ++	disk_usage_slow --objects HEAD >actual_size &&
     ++	grep "$(cat actual_size) bytes" actual
      +'
      +
     -+test_expect_success 'rev-list --disk-usage with bitmap and --human-readable' '
     -+	git rev-list --objects HEAD --use-bitmap-index --disk-usage -H >actual &&
     -+	test_i18ngrep -e "446 bytes" actual
     ++test_expect_success 'rev-list --disk-usage=human with bitmaps' '
     ++	git rev-list --objects HEAD --use-bitmap-index --disk-usage=human >actual &&
     ++	disk_usage_slow --objects HEAD >actual_size &&
     ++	grep "$(cat actual_size) bytes" actual
      +'
      +
     -+test_expect_success 'rev-list use --human-readable without --disk-usage' '
     -+	test_must_fail git rev-list --objects HEAD --human-readable 2> err &&
     -+	echo "fatal: option '\''--human-readable/-H'\'' should be used with" \
     -+	"'\''--disk-usage'\'' together" >expect &&
     ++test_expect_success 'rev-list use --disk-usage unproperly' '
     ++	test_must_fail git rev-list --objects HEAD --disk-usage=typo 2>err &&
     ++	cat >expect <<-\EOF &&
     ++	fatal: invalid value for '\''--disk-usage'\'': '\''typo'\'', try --disk-usage=human
     ++	EOF
      +	test_cmp err expect
      +'
      +

 Documentation/rev-list-options.txt |  5 +++-
 builtin/rev-list.c                 | 42 ++++++++++++++++++++++++------
 t/t6115-rev-list-du.sh             | 22 ++++++++++++++++
 3 files changed, 60 insertions(+), 9 deletions(-)