Hi,
Han-Wen Nienhuys wrote:
> The colorization is controlled with the config setting "color.remote".
>
> Supported keywords are "error", "warning", "hint" and "success". They
> are highlighted if they appear at the start of the line, which is
> common in error messages, eg.
>
> ERROR: commit is missing Change-Id
A few questions:
- should this be documented somewhere in Documentation/technical/*protocol*?
That way, server implementors can know to take advantage of it.
- how does this interact with (future) internationalization of server
messages? If my server knows that the client speaks French, should
they send "ERROR:" anyway and rely on the client to translate it?
Or are we deferring that question to a later day?
[...]
> The Git push process itself prints lots of non-actionable messages
> (eg. bandwidth statistics, object counters for different phases of the
> process), and my hypothesis is that these obscure the actionable error
> messages that our server sends back. Highlighting keywords in the
> draws more attention to actionable messages.
I'd be interested in ways to minimize Git's contribution to this as
well. E.g. can we make more use of \r to make client-produced progress
messages take less screen real estate? Should some of the servers
involved (e.g., Gerrit) do so as well?
> The highlighting is done on the client rather than server side, so
> servers don't have to grow capabilities to understand terminal escape
> codes and terminal state. It also consistent with the current state
> where Git is control of the local display (eg. prefixing messages with
> "remote: ").
As a strawman idea, what would you think of a way to allow the server
to do some coloration by using color tags like
<red>Erreur</red>: ...
?
As an advantage, this would give the server more control. As a
disadvantage, it is not so useful as "semantic markup", meaning it is
harder to figure out how to present to accessibility tools in a
meaningful way. Plus, there's the issue of usefulness with existing
servers you mentioned:
> Finally, this solution is backwards compatible: many servers already
> prefix their messages with "error", and they will benefit from this
> change without requiring a server update.
Yes, this seems like a compelling reason to follow this approach.
[...]
> --- a/Documentation/config.txt
> +++ b/Documentation/config.txt
> @@ -1229,6 +1229,15 @@ color.push::
> color.push.error::
> Use customized color for push errors.
>
> +color.remote::
> + A boolean to enable/disable colored remote output. If unset,
> + then the value of `color.ui` is used (`auto` by default).
> +
> +color.remote.<slot>::
> + Use customized color for each remote keywords. `<slot>` may be
> + `hint`, `warning`, `success` or `error` which match the
> + corresponding keyword.
What positions in a remote message are matched? If a server prints a
message about something being discouraged because it is error-prone,
would the "error" in error-prone turn red?
[...]
> --- a/sideband.c
> +++ b/sideband.c
> @@ -1,6 +1,103 @@
> #include "cache.h"
> +#include "color.h"
> +#include "config.h"
> #include "pkt-line.h"
> #include "sideband.h"
> +#include "help.h"
> +
> +struct kwtable {
nit: perhaps kwtable_entry?
> + /*
> + * We use keyword as config key so it can't contain funny chars like
> + * spaces. When we do that, we need a separate field for slot name in
> + * load_sideband_colors().
> + */
> + const char *keyword;
> + char color[COLOR_MAXLEN];
> +};
> +
> +static struct kwtable keywords[] = {
> + { "hint", GIT_COLOR_YELLOW },
[...]
> +// Returns a color setting (GIT_COLOR_NEVER, etc).
nit: Git uses C89-style /* */ comments.
> +static int use_sideband_colors(void)
Makes sense.
[...]
> +void list_config_color_sideband_slots(struct string_list *list, const char
> *prefix)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(keywords); i++)
> + list_config_item(list, prefix, keywords[i].keyword);
> +}
Not about this patch: I wonder if we can eliminate this boilerplate some
time in the future.
[...]
> +/*
> + * Optionally highlight some keywords in remote output if they appear at the
> + * start of the line. This should be called for a single line only.
> + */
> +void maybe_colorize_sideband(struct strbuf *dest, const char *src, int n)
Can this be static?
What does 'n' represent? Can the comment say? (Or if it's the length
of src, can it be renamed to srclen?)
Super-pedantic nit: even if there are multiple special words at the
start, this will only highlight one. :) So it could say something
like "Optionally check if the first word on the line is a keyword and
highlight it if so."
> +{
> + int i;
> + if (!want_color_stderr(use_sideband_colors())) {
nit: whitespace damage (you can check for this with "git show --check").
There's a bit more elsewhere.
> + strbuf_add(dest, src, n);
> + return;
> + }
> +
> + while (isspace(*src)) {
> + strbuf_addch(dest, *src);
> + src++;
> + n--;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(keywords); i++) {
> + struct kwtable* p = keywords + i;
nit: * should attach to the variable, C-style.
You can use "make style" to do some automatic formatting (though this
is a bit experimental, so do double-check the results).
> + int len = strlen(p->keyword);
> + /*
> + * Match case insensitively, so we colorize output from
> existing
> + * servers regardless of the case that they use for their
> + * messages. We only highlight the word precisely, so
> + * "successful" stays uncolored.
> + */
> + if (!strncasecmp(p->keyword, src, len) && !isalnum(src[len])) {
> + strbuf_addstr(dest, p->color);
> + strbuf_add(dest, src, len);
> + strbuf_addstr(dest, GIT_COLOR_RESET);
> + n -= len;
> + src += len;
> + break;
> + }
Sensible.
[...]
> @@ -48,8 +145,10 @@ int recv_sideband(const char *me, int in_stream, int out)
> len--;
> switch (band) {
> case 3:
> - strbuf_addf(&outbuf, "%s%s%s", outbuf.len ? "\n" : "",
> - DISPLAY_PREFIX, buf + 1);
> + strbuf_addf(&outbuf, "%s%s", outbuf.len ? "\n" : "",
> + DISPLAY_PREFIX);
> + maybe_colorize_sideband(&outbuf, buf + 1, len);
> +
> retval = SIDEBAND_REMOTE_ERROR;
> break;
> case 2:
> @@ -69,20 +168,22 @@ int recv_sideband(const char *me, int in_stream, int out)
> if (!outbuf.len)
> strbuf_addstr(&outbuf, DISPLAY_PREFIX);
> if (linelen > 0) {
> - strbuf_addf(&outbuf, "%.*s%s%c",
> - linelen, b, suffix, *brk);
> - } else {
> - strbuf_addch(&outbuf, *brk);
> + maybe_colorize_sideband(&outbuf, b,
> linelen);
> + strbuf_addstr(&outbuf, suffix);
> }
> +
> + strbuf_addch(&outbuf, *brk);
> xwrite(2, outbuf.buf, outbuf.len);
Nice. This looks cleaner than what was there before, which is always
a good sign.
[...]
> --- /dev/null
> +++ b/t/t5409-colorize-remote-messages.sh
Thanks for these. It may make sense to have a test with some leading
whitespace as well.
[...]
> +test_expect_success 'setup' '
> + mkdir .git/hooks &&
> + cat << EOF > .git/hooks/update &&
> +#!/bin/sh
> +echo error: error
> +echo hint: hint
> +echo success: success
> +echo warning: warning
> +echo prefixerror: error
> +exit 0
> +EOF
> + chmod +x .git/hooks/update &&
Please use write_script for this, since on esoteric platforms it picks
an appropriate shell.
If you use <<-\EOF instead of <<EOF, that has two advantages:
- it lets you indent the script
- it saves the reviewer from having to look for $ escapes inside the
script body
> + echo 1 >file &&
> + git add file &&
> + git commit -m 1 &&
This can use test_commit. See t/README for details.
[...]
> +test_expect_success 'push' '
> + git -c color.remote=always push -f origin HEAD:refs/heads/newbranch
> 2>output &&
> + test_decode_color <output >decoded &&
> + grep "<BOLD;RED>error<RESET>:" decoded &&
> + grep "<YELLOW>hint<RESET>:" decoded &&
> + grep "<BOLD;GREEN>success<RESET>:" decoded &&
> + grep "<BOLD;YELLOW>warning<RESET>:" decoded &&
> + grep "prefixerror: error" decoded
> +'
> +
> +test_expect_success 'push with customized color' '
> + git -c color.remote=always -c color.remote.error=white push -f origin
> HEAD:refs/heads/newbranch2 2>output &&
> + test_decode_color <output >decoded &&
> + grep "<WHITE>error<RESET>:" decoded &&
> + grep "<YELLOW>hint<RESET>:" decoded &&
> + grep "<BOLD;GREEN>success<RESET>:" decoded &&
> + grep "<BOLD;YELLOW>warning<RESET>:" decoded
> +'
Nice.
Thanks and hope that helps,
Jonathan
