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Merge pull request #5945 from afishhh/master

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Make `nix search` highlight all regexes and matches
This commit is contained in:
Théophane Hufschmitt 2022-01-24 13:02:51 +01:00 committed by GitHub
parent edf0cde1a7 ffb28eaa1e
commit 4530574363
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 154 additions and 26 deletions
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38
src/libutil/fmt.cc Normal file
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@ -0,0 +1,38 @@
#include <regex>
namespace nix {
std::string hiliteMatches(const std::string &s, std::vector<std::smatch> matches, std::string prefix, std::string postfix) {
// Avoid copy on zero matches
if (matches.size() == 0)
return s;
std::sort(matches.begin(), matches.end(), [](const auto &a, const auto &b) {
return a.position() < b.position();
});
std::string out;
ssize_t last_end = 0;
for (auto it = matches.begin(); it != matches.end();) {
auto m = *it;
size_t start = m.position();
out.append(s.substr(last_end, m.position() - last_end));
// Merge continous matches
ssize_t end = start + m.length();
while(++it != matches.end() && (*it).position() <= end) {
auto n = *it;
ssize_t nend = start + (n.position() - start + n.length());
if(nend > end)
end = nend;
}
out.append(prefix);
out.append(s.substr(start, end - start));
out.append(postfix);
last_end = end;
}
out.append(s.substr(last_end));
return out;
}
}

10
src/libutil/fmt.hh
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@ -2,6 +2,7 @@
#include <boost/format.hpp>
#include <string>
#include <regex>
#include "ansicolor.hh"
@ -154,4 +155,13 @@ inline hintformat hintfmt(std::string plain_string)
// we won't be receiving any args in this case, so just print the original string
return hintfmt("%s", normaltxt(plain_string));
}
/**
* Highlight all the given matches in the given string `s` by wrapping them
* between `prefix` and `postfix`.
*
* If some matches overlap, then their union will be wrapped rather than the
* individual matches.
*/
std::string hiliteMatches(const std::string &s, std::vector<std::smatch> matches, std::string prefix, std::string postfix);
}

68
src/libutil/tests/fmt.cc Normal file
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@ -0,0 +1,68 @@
#include "fmt.hh"
#include <gtest/gtest.h>
#include <regex>
namespace nix {
/* ----------- tests for fmt.hh -------------------------------------------------*/
TEST(hiliteMatches, noHighlight) {
ASSERT_STREQ(hiliteMatches("Hello, world!", std::vector<std::smatch>(), "(", ")").c_str(), "Hello, world!");
}
TEST(hiliteMatches, simpleHighlight) {
std::string str = "Hello, world!";
std::regex re = std::regex("world");
auto matches = std::vector(std::sregex_iterator(str.begin(), str.end(), re), std::sregex_iterator());
ASSERT_STREQ(
hiliteMatches(str, matches, "(", ")").c_str(),
"Hello, (world)!"
);
}
TEST(hiliteMatches, multipleMatches) {
std::string str = "Hello, world, world, world, world, world, world, Hello!";
std::regex re = std::regex("world");
auto matches = std::vector(std::sregex_iterator(str.begin(), str.end(), re), std::sregex_iterator());
ASSERT_STREQ(
hiliteMatches(str, matches, "(", ")").c_str(),
"Hello, (world), (world), (world), (world), (world), (world), Hello!"
);
}
TEST(hiliteMatches, overlappingMatches) {
std::string str = "world, Hello, world, Hello, world, Hello, world, Hello, world!";
std::regex re = std::regex("Hello, world");
std::regex re2 = std::regex("world, Hello");
auto v = std::vector(std::sregex_iterator(str.begin(), str.end(), re), std::sregex_iterator());
for(auto it = std::sregex_iterator(str.begin(), str.end(), re2); it != std::sregex_iterator(); ++it) {
v.push_back(*it);
}
ASSERT_STREQ(
hiliteMatches(str, v, "(", ")").c_str(),
"(world, Hello, world, Hello, world, Hello, world, Hello, world)!"
);
}
TEST(hiliteMatches, complexOverlappingMatches) {
std::string str = "legacyPackages.x86_64-linux.git-crypt";
std::vector regexes = {
std::regex("t-cry"),
std::regex("ux\\.git-cry"),
std::regex("git-c"),
std::regex("pt"),
};
std::vector<std::smatch> matches;
for(auto regex : regexes)
{
for(auto it = std::sregex_iterator(str.begin(), str.end(), regex); it != std::sregex_iterator(); ++it) {
matches.push_back(*it);
}
}
ASSERT_STREQ(
hiliteMatches(str, matches, "(", ")").c_str(),
"legacyPackages.x86_64-lin(ux.git-crypt)"
);
}
}

51
src/nix/search.cc
View file

@ -9,6 +9,7 @@
#include "shared.hh"
#include "eval-cache.hh"
#include "attr-path.hh"
#include "fmt.hh"
#include <regex>
#include <fstream>
@ -20,16 +21,6 @@ std::string wrap(std::string prefix, std::string s)
return prefix + s + ANSI_NORMAL;
}
std::string hilite(const std::string & s, const std::smatch & m, std::string postfix)
{
return
m.empty()
? s
: std::string(m.prefix())
+ ANSI_GREEN + std::string(m.str()) + postfix
+ std::string(m.suffix());
}
struct CmdSearch : InstallableCommand, MixJSON
{
std::vector<std::string> res;
@ -100,8 +91,6 @@ struct CmdSearch : InstallableCommand, MixJSON
};
if (cursor.isDerivation()) {
size_t found = 0;
DrvName name(cursor.getAttr("name")->getString());
auto aMeta = cursor.maybeGetAttr("meta");
@ -110,21 +99,31 @@ struct CmdSearch : InstallableCommand, MixJSON
std::replace(description.begin(), description.end(), '\n', ' ');
auto attrPath2 = concatStringsSep(".", attrPath);
std::smatch attrPathMatch;
std::smatch descriptionMatch;
std::smatch nameMatch;
std::vector<std::smatch> attrPathMatches;
std::vector<std::smatch> descriptionMatches;
std::vector<std::smatch> nameMatches;
bool found = false;
for (auto & regex : regexes) {
std::regex_search(attrPath2, attrPathMatch, regex);
std::regex_search(name.name, nameMatch, regex);
std::regex_search(description, descriptionMatch, regex);
if (!attrPathMatch.empty()
|| !nameMatch.empty()
|| !descriptionMatch.empty())
found++;
found = false;
auto add_all = [&found](std::sregex_iterator it, std::vector<std::smatch>& vec){
const auto end = std::sregex_iterator();
while(it != end) {
vec.push_back(*it++);
found = true;
}
};
add_all(std::sregex_iterator(attrPath2.begin(), attrPath2.end(), regex), attrPathMatches);
add_all(std::sregex_iterator(name.name.begin(), name.name.end(), regex), nameMatches);
add_all(std::sregex_iterator(description.begin(), description.end(), regex), descriptionMatches);
if(!found)
break;
}
if (found == res.size()) {
if (found)
{
results++;
if (json) {
auto jsonElem = jsonOut->object(attrPath2);
@ -132,15 +131,15 @@ struct CmdSearch : InstallableCommand, MixJSON
jsonElem.attr("version", name.version);
jsonElem.attr("description", description);
} else {
auto name2 = hilite(name.name, nameMatch, "\e[0;2m");
auto name2 = hiliteMatches(name.name, std::move(nameMatches), ANSI_GREEN, "\e[0;2m");
if (results > 1) logger->cout("");
logger->cout(
"* %s%s",
wrap("\e[0;1m", hilite(attrPath2, attrPathMatch, "\e[0;1m")),
wrap("\e[0;1m", hiliteMatches(attrPath2, std::move(attrPathMatches), ANSI_GREEN, "\e[0;1m")),
name.version != "" ? " (" + name.version + ")" : "");
if (description != "")
logger->cout(
" %s", hilite(description, descriptionMatch, ANSI_NORMAL));
" %s", hiliteMatches(description, std::move(descriptionMatches), ANSI_GREEN, ANSI_NORMAL));
}
}
}

13
tests/search.sh
View file

@ -23,3 +23,16 @@ clearCache
nix search -f search.nix '' |grep -q foo
nix search -f search.nix '' |grep -q bar
nix search -f search.nix '' |grep -q hello
## Tests for multiple regex/match highlighting
e=$'\x1b' # grep doesn't support \e, \033 or even \x1b
# Multiple overlapping regexes
(( $(nix search -f search.nix '' 'oo' 'foo' 'oo' | grep "$e\[32;1mfoo$e\\[0;1m" | wc -l) == 1 ))
(( $(nix search -f search.nix '' 'broken b' 'en bar' | grep "$e\[32;1mbroken bar$e\\[0m" | wc -l) == 1 ))
# Multiple matches
# Searching for 'o' should yield the 'o' in 'broken bar', the 'oo' in foo and 'o' in hello
(( $(nix search -f search.nix '' 'o' | grep -Eo "$e\[32;1mo{1,2}$e\[(0|0;1)m" | wc -l) == 3 ))
# Searching for 'b' should yield the 'b' in bar and the two 'b's in 'broken bar'
(( $(nix search -f search.nix '' 'b' | grep -Eo "$e\[32;1mb$e\[(0|0;1)m" | wc -l) == 3 ))