From: "James Coglan via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>, James Coglan <jcoglan@gmail.com>
Subject: [PATCH v3 07/13] graph: example of graph output that can be simplified
Date: Tue, 15 Oct 2019 23:47:53 +0000 [thread overview]
Message-ID: <631ee3cecb68d9f776d4a8fb30c1bca70797ba14.1571183279.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.383.v3.git.1571183279.gitgitgadget@gmail.com>
From: James Coglan <jcoglan@gmail.com>
The commits following this one introduce a series of improvements to the
layout of graphs, tidying up a few edge cases, namely:
- merge whose first parent fuses with an existing column to the left
- merge whose last parent fuses with its immediate neighbor on the right
- edges that collapse to the left above and below a commit line
This test case exemplifies these cases and provides a motivating example
of the kind of history I'm aiming to clear up.
The first parent of merge E is the same as the parent of H, so those
edges fuse together.
* H
|
| *-. E
| |\ \
|/ / /
|
* B
We can "skew" the display of this merge so that it doesn't introduce
additional columns that immediately collapse:
* H
|
| * E
|/|\
|
* B
The last parent of E is D, the same as the parent of F which is the edge
to the right of the merge.
* F
|
\
*-. \ E
|\ \ \
/ / / /
| /
|/
* D
The two edges leading to D could be fused sooner: rather than expanding
the F edge around the merge and then letting the edges collapse, the F
edge could fuse with the E edge in the post-merge line:
* F
|
\
*-. | E
|\ \|
/ / /
|
* D
If this is combined with the "skew" effect above, we get a much cleaner
graph display for these edges:
* F
|
* | E
/|\|
|
* D
Finally, the edge leading from C to A appears jagged as it passes
through the commit line for B:
| * | C
| |/
* | B
|/
* A
This can be smoothed out so that such edges are easier to read:
| * | C
| |/
* / B
|/
* A
Signed-off-by: James Coglan <jcoglan@gmail.com>
---
t/t4215-log-skewed-merges.sh | 43 ++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
create mode 100755 t/t4215-log-skewed-merges.sh
diff --git a/t/t4215-log-skewed-merges.sh b/t/t4215-log-skewed-merges.sh
new file mode 100755
index 0000000000..4582ba066a
--- /dev/null
+++ b/t/t4215-log-skewed-merges.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+test_description='git log --graph of skewed merges'
+
+. ./test-lib.sh
+
+test_expect_success 'log --graph with merge fusing with its left and right neighbors' '
+ cat >expect <<-\EOF &&
+ * H
+ |\
+ | * G
+ | |\
+ | | * F
+ | | |
+ | | \
+ | *-. \ E
+ | |\ \ \
+ |/ / / /
+ | | | /
+ | | |/
+ | | * D
+ | * | C
+ | |/
+ * | B
+ |/
+ * A
+ EOF
+
+ git checkout --orphan _p &&
+ test_commit A &&
+ test_commit B &&
+ git checkout -b _q @^ && test_commit C &&
+ git checkout -b _r @^ && test_commit D &&
+ git checkout _p && git merge --no-ff _q _r -m E &&
+ git checkout _r && test_commit F &&
+ git checkout _p && git merge --no-ff _r -m G &&
+ git checkout @^^ && git merge --no-ff _p -m H &&
+
+ git log --graph --pretty=tformat:%s | sed "s/ *$//" >actual &&
+ test_cmp expect actual
+'
+
+test_done
--
gitgitgadget
next prev parent reply other threads:[~2019-10-15 23:48 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-10 16:13 [PATCH 00/11] Improve the readability of log --graph output James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 01/11] graph: automatically track visible width of `strbuf` James Coglan via GitGitGadget
2019-10-10 21:07 ` Johannes Schindelin
2019-10-10 23:05 ` Denton Liu
2019-10-11 0:49 ` Derrick Stolee
2019-10-11 1:42 ` Junio C Hamano
2019-10-11 5:01 ` Denton Liu
2019-10-11 16:02 ` Johannes Schindelin
2019-10-11 17:20 ` James Coglan
2019-10-12 0:27 ` Junio C Hamano
2019-10-12 16:22 ` Johannes Schindelin
2019-10-14 12:55 ` James Coglan
2019-10-14 13:01 ` James Coglan
2019-10-16 2:15 ` Junio C Hamano
2019-10-11 1:40 ` Junio C Hamano
2019-10-11 17:08 ` James Coglan
2019-10-10 16:13 ` [PATCH 02/11] graph: reuse `find_new_column_by_commit()` James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 03/11] graph: reduce duplication in `graph_insert_into_new_columns()` James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 04/11] graph: remove `mapping_idx` and `graph_update_width()` James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 06/11] graph: tidy up display of left-skewed merges James Coglan via GitGitGadget
2019-10-10 17:19 ` Derrick Stolee
2019-10-11 16:50 ` James Coglan
2019-10-12 1:36 ` Derrick Stolee
2019-10-14 13:11 ` James Coglan
2019-10-10 16:13 ` [PATCH 05/11] graph: extract logic for moving to GRAPH_PRE_COMMIT state James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 07/11] graph: commit and post-merge lines for left-skewed merges James Coglan via GitGitGadget
2019-10-10 17:49 ` Derrick Stolee
2019-10-11 17:04 ` James Coglan
2019-10-13 6:56 ` Jeff King
2019-10-14 15:38 ` James Coglan
2019-10-14 17:41 ` Derrick Stolee
2019-10-14 20:42 ` Johannes Schindelin
2019-10-10 16:13 ` [PATCH 08/11] graph: rename `new_mapping` to `old_mapping` James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 09/11] graph: smooth appearance of collapsing edges on commit lines James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 10/11] graph: flatten edges that join to their right neighbor James Coglan via GitGitGadget
2019-10-10 16:13 ` [PATCH 11/11] graph: fix coloring of octopus dashes James Coglan via GitGitGadget
2019-10-10 18:16 ` Denton Liu
2019-10-10 18:28 ` Denton Liu
2019-10-13 7:22 ` Jeff King
2019-10-10 17:54 ` [PATCH 00/11] Improve the readability of log --graph output Derrick Stolee
2019-10-13 7:15 ` Jeff King
2019-10-14 15:49 ` James Coglan
2019-10-15 23:40 ` [PATCH v2 00/13] " James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 01/13] graph: automatically track display width of graph lines James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 02/13] graph: handle line padding in `graph_next_line()` James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 03/13] graph: reuse `find_new_column_by_commit()` James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 04/13] graph: reduce duplication in `graph_insert_into_new_columns()` James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 05/13] graph: remove `mapping_idx` and `graph_update_width()` James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 06/13] graph: extract logic for moving to GRAPH_PRE_COMMIT state James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 07/13] graph: example of graph output that can be simplified James Coglan via GitGitGadget
2019-10-15 23:40 ` [PATCH v2 08/13] graph: tidy up display of left-skewed merges James Coglan via GitGitGadget
2019-10-15 23:41 ` [PATCH v2 09/13] graph: commit and post-merge lines for " James Coglan via GitGitGadget
2019-10-15 23:41 ` [PATCH v2 10/13] graph: rename `new_mapping` to `old_mapping` James Coglan via GitGitGadget
2019-10-15 23:41 ` [PATCH v2 11/13] graph: smooth appearance of collapsing edges on commit lines James Coglan via GitGitGadget
2019-10-15 23:41 ` [PATCH v2 12/13] graph: flatten edges that fuse with their right neighbor James Coglan via GitGitGadget
2019-10-15 23:41 ` [PATCH v2 13/13] graph: fix coloring of octopus dashes James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 00/13] Improve the readability of log --graph output James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 01/13] graph: automatically track display width of graph lines James Coglan via GitGitGadget
2019-10-16 3:35 ` Junio C Hamano
2019-10-16 5:10 ` Junio C Hamano
2019-10-15 23:47 ` [PATCH v3 02/13] graph: handle line padding in `graph_next_line()` James Coglan via GitGitGadget
2019-10-16 3:37 ` Junio C Hamano
2019-10-15 23:47 ` [PATCH v3 03/13] graph: reuse `find_new_column_by_commit()` James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 04/13] graph: reduce duplication in `graph_insert_into_new_columns()` James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 05/13] graph: remove `mapping_idx` and `graph_update_width()` James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 06/13] graph: extract logic for moving to GRAPH_PRE_COMMIT state James Coglan via GitGitGadget
2019-10-15 23:47 ` James Coglan via GitGitGadget [this message]
2019-10-17 12:30 ` [PATCH v3 07/13] graph: example of graph output that can be simplified Derrick Stolee
2019-10-18 15:21 ` SZEDER Gábor
2019-11-12 1:08 ` [PATCH] t4215: don't put git commands upstream of pipe Denton Liu
2019-11-12 6:57 ` Junio C Hamano
2019-11-12 10:54 ` SZEDER Gábor
2019-11-12 18:56 ` [PATCH v3] t4215: use helper function to check output Denton Liu
2019-11-13 2:05 ` Junio C Hamano
2019-10-15 23:47 ` [PATCH v3 08/13] graph: tidy up display of left-skewed merges James Coglan via GitGitGadget
2019-10-16 4:00 ` Junio C Hamano
2019-10-17 12:34 ` Derrick Stolee
2019-10-18 0:49 ` Junio C Hamano
2019-10-15 23:47 ` [PATCH v3 09/13] graph: commit and post-merge lines for " James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 10/13] graph: rename `new_mapping` to `old_mapping` James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 11/13] graph: smooth appearance of collapsing edges on commit lines James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 12/13] graph: flatten edges that fuse with their right neighbor James Coglan via GitGitGadget
2019-10-15 23:47 ` [PATCH v3 13/13] graph: fix coloring of octopus dashes James Coglan via GitGitGadget
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