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Revert "Merge pull request #10980 from kjeremy/flake-show-description"

Browse source 
This reverts commit 1c5ad159d6, reversing
changes made to 67de193277.

This reverts commit ce4e4a158e, reversing
changes made to 43e82c9446.
This commit is contained in:
Eelco Dolstra 2024-11-07 18:07:48 +01:00
parent 3ab8534b13
commit 47bffe20e4
3 changed files with 9 additions and 132 deletions
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25
doc/manual/rl-next/nix-flake-show-description.md
View file

@ -1,25 +0,0 @@
---
synopsis: Show package descriptions with `nix flake show`
issues: [10977]
prs: [10980]
---
`nix flake show` will now display a package's `meta.description` if it exists. If the description does not fit in the terminal it will be truncated to fit the terminal width. If the size of the terminal width is unknown the description will be capped at 80 characters.
```
$ nix flake show
└───packages
└───x86_64-linux
├───builderImage: package 'docker-image-ara-builder-image.tar.gz' - 'Docker image hosting the nix build environment'
└───runnerImage: package 'docker-image-gitlab-runner.tar.gz' - 'Docker image hosting the gitlab-runner executable'
```
In a narrower terminal:
```
$ nix flake show
└───packages
└───x86_64-linux
├───builderImage: package 'docker-image-ara-builder-image.tar.gz' - 'Docker image hosting the nix b...
└───runnerImage: package 'docker-image-gitlab-runner.tar.gz' - 'Docker image hosting the gitlab-run...
```

85
src/nix/flake.cc
View file

@ -17,7 +17,6 @@
#include "eval-cache.hh"
#include "markdown.hh"
#include "users.hh"
#include "terminal.hh"
#include <filesystem>
#include <nlohmann/json.hpp>
@ -1275,97 +1274,25 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
auto showDerivation = [&]()
{
auto name = visitor.getAttr(state->sName)->getString();
if (json) {
std::optional<std::string> description;
if (auto aMeta = visitor.maybeGetAttr(state->sMeta)) {
if (auto aDescription = aMeta->maybeGetAttr(state->sDescription))
description = aDescription->getString();
}
if (json) {
j.emplace("type", "derivation");
j.emplace("name", name);
j.emplace("description", description ? *description : "");
} else {
auto type =
logger->cout("%s: %s '%s'",
headerPrefix,
attrPath.size() == 2 && attrPathS[0] == "devShell" ? "development environment" :
attrPath.size() >= 2 && attrPathS[0] == "devShells" ? "development environment" :
attrPath.size() == 3 && attrPathS[0] == "checks" ? "derivation" :
attrPath.size() >= 1 && attrPathS[0] == "hydraJobs" ? "derivation" :
"package";
if (description && !description->empty()) {
// Takes a string and returns the # of characters displayed
auto columnLengthOfString = [](std::string_view s) -> unsigned int {
unsigned int columnCount = 0;
for (auto i = s.begin(); i < s.end();) {
// Test first character to determine if it is one of
// treeConn, treeLast, treeLine
if (*i == -30) {
i += 3;
++columnCount;
}
// Escape sequences
// https://en.wikipedia.org/wiki/ANSI_escape_code
else if (*i == '\e') {
// Eat '['
if (*(++i) == '[') {
++i;
// Eat parameter bytes
while(*i >= 0x30 && *i <= 0x3f) ++i;
// Eat intermediate bytes
while(*i >= 0x20 && *i <= 0x2f) ++i;
// Eat final byte
if(*i >= 0x40 && *i <= 0x73) ++i;
}
else {
// Eat Fe Escape sequence
if (*i >= 0x40 && *i <= 0x5f) ++i;
}
}
else {
++i;
++columnCount;
}
}
return columnCount;
};
// Maximum length to print
size_t maxLength = getWindowSize().second > 0 ? getWindowSize().second : 80;
// Trim the description and only use the first line
auto trimmed = trim(*description);
auto newLinePos = trimmed.find('\n');
auto length = newLinePos != std::string::npos ? newLinePos : trimmed.length();
auto beginningOfLine = fmt("%s: %s '%s'", headerPrefix, type, name);
auto line = fmt("%s: %s '%s' - '%s'", headerPrefix, type, name, trimmed.substr(0, length));
// If we are already over the maximum length then do not trim
// and don't print the description (preserves existing behavior)
if (columnLengthOfString(beginningOfLine) >= maxLength) {
logger->cout("%s", beginningOfLine);
}
// If the entire line fits then print that
else if (columnLengthOfString(line) < maxLength) {
logger->cout("%s", line);
}
// Otherwise we need to truncate
else {
auto lineLength = columnLengthOfString(line);
auto chopOff = lineLength - maxLength;
line.resize(line.length() - chopOff);
line = line.replace(line.length() - 3, 3, "...");
logger->cout("%s", line);
}
}
else {
logger->cout("%s: %s '%s'", headerPrefix, type, name);
}
"package",
name);
}
};

25
tests/functional/flakes/show.sh
View file

@ -87,28 +87,3 @@ assert show_output.legacyPackages.${builtins.currentSystem}.AAAAAASomeThingsFail
assert show_output.legacyPackages.${builtins.currentSystem}.simple.name == "simple";
true
'
cat >flake.nix<<EOF
{
outputs = inputs: {
packages.$system = {
aNoDescription = import ./simple.nix;
bOneLineDescription = import ./simple.nix // { meta.description = "one line"; };
cMultiLineDescription = import ./simple.nix // { meta.description = ''
line one
line two
''; };
dLongDescription = import ./simple.nix // { meta.description = ''
01234567890123456789012345678901234567890123456789012345678901234567890123456789abcdefg
''; };
eEmptyDescription = import ./simple.nix // { meta.description = ""; };
};
};
}
EOF
nix flake show > ./show-output.txt
test "$(awk -F '[:] ' '/aNoDescription/{print $NF}' ./show-output.txt)" = "package 'simple'"
test "$(awk -F '[:] ' '/bOneLineDescription/{print $NF}' ./show-output.txt)" = "package 'simple' - 'one line'"
test "$(awk -F '[:] ' '/cMultiLineDescription/{print $NF}' ./show-output.txt)" = "package 'simple' - 'line one'"
test "$(awk -F '[:] ' '/dLongDescription/{print $NF}' ./show-output.txt)" = "package 'simple' - '012345678901234567890123456..."
test "$(awk -F '[:] ' '/eEmptyDescription/{print $NF}' ./show-output.txt)" = "package 'simple'"