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Pretty-print values in the REPL

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Pretty-print values in the REPL by printing each item in a list or
attrset on a separate line. When possible, single-item lists and
attrsets are printed on one line, as long as they don't contain a nested
list, attrset, or thunk.

Before:
```
{ attrs = { a = { b = { c = { }; }; }; }; list = [ 1 ]; list' = [ 1 2 3 ]; }
```

After:
```
{
  attrs = {
    a = {
      b = {
        c = { };
      };
    };
  };
  list = [ 1 ];
  list' = [
    1
    2
    3
  ];
}
```

(cherry picked from commit c0a15fb7d03dfb8f53bc6726c414bc88aa362592)
Change-Id: Ia2b41849165a5ddb63f7a8c272a2476b3e4292df
This commit is contained in:
eldritch horrors 2024-03-08 08:25:42 +01:00
parent b221a14f0a
commit 1958152d14
6 changed files with 194 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
src/libcmd/repl.cc
View file

@ -98,7 +98,8 @@ struct NixRepl
.ansiColors = true,
.force = true,
.derivationPaths = true,
.maxDepth = maxDepth
.maxDepth = maxDepth,
.prettyIndent = 2
});
}
};

22
src/libexpr/print-options.hh
View file

@ -17,24 +17,29 @@ struct PrintOptions
* If true, output ANSI color sequences.
*/
bool ansiColors = false;
/**
* If true, force values.
*/
bool force = false;
/**
* If true and `force` is set, print derivations as
* `«derivation /nix/store/...»` instead of as attribute sets.
*/
bool derivationPaths = false;
/**
* If true, track which values have been printed and skip them on
* subsequent encounters. Useful for self-referential values.
*/
bool trackRepeated = true;
/**
* Maximum depth to evaluate to.
*/
size_t maxDepth = std::numeric_limits<size_t>::max();
/**
* Maximum number of attributes in attribute sets to print.
*
@ -42,6 +47,7 @@ struct PrintOptions
* attribute set encountered.
*/
size_t maxAttrs = std::numeric_limits<size_t>::max();
/**
* Maximum number of list items to print.
*
@ -49,10 +55,26 @@ struct PrintOptions
* list encountered.
*/
size_t maxListItems = std::numeric_limits<size_t>::max();
/**
* Maximum string length to print.
*/
size_t maxStringLength = std::numeric_limits<size_t>::max();
/**
* Indentation width for pretty-printing.
*
* If set to 0 (the default), values are not pretty-printed.
*/
size_t prettyIndent = 0;
/**
* True if pretty-printing is enabled.
*/
inline bool prettyPrint()
{
return prettyIndent > 0;
}
};
/**

110
src/libexpr/print.cc
View file

@ -151,6 +151,7 @@ struct ImportantFirstAttrNameCmp
};
typedef std::set<const void *> ValuesSeen;
typedef std::vector<std::pair<std::string, Value *>> AttrVec;
class Printer
{
@ -161,6 +162,21 @@ private:
std::optional<ValuesSeen> seen;
size_t attrsPrinted = 0;
size_t listItemsPrinted = 0;
std::string indent;
void increaseIndent()
{
if (options.prettyPrint()) {
indent.append(options.prettyIndent, ' ');
}
}
void decreaseIndent()
{
if (options.prettyPrint()) {
indent.resize(indent.size() - options.prettyIndent);
}
}
void printRepeated()
{
@ -258,6 +274,28 @@ private:
}
}
bool shouldPrettyPrintAttrs(AttrVec & v)
{
if (!options.prettyPrint() || v.empty()) {
return false;
}
// Pretty-print attrsets with more than one item.
if (v.size() > 1) {
return true;
}
auto item = v[0].second;
if (!item) {
return true;
}
// Pretty-print single-item attrsets only if they contain nested
// structures.
auto itemType = item->type();
return itemType == nList || itemType == nAttrs || itemType == nThunk;
}
void printAttrs(Value & v, size_t depth)
{
if (seen && !seen->insert(v.attrs).second) {
@ -268,9 +306,10 @@ private:
if (options.force && options.derivationPaths && state.isDerivation(v)) {
printDerivation(v);
} else if (depth < options.maxDepth) {
output << "{ ";
increaseIndent();
output << "{";
std::vector<std::pair<std::string, Value *>> sorted;
AttrVec sorted;
for (auto & i : *v.attrs)
sorted.emplace_back(std::pair(state.symbols[i.name], i.value));
@ -279,7 +318,15 @@ private:
else
std::sort(sorted.begin(), sorted.end(), ImportantFirstAttrNameCmp());
auto prettyPrint = shouldPrettyPrintAttrs(sorted);
for (auto & i : sorted) {
if (prettyPrint) {
output << "\n" << indent;
} else {
output << " ";
}
if (attrsPrinted >= options.maxAttrs) {
printElided(sorted.size() - attrsPrinted, "attribute", "attributes");
break;
@ -288,14 +335,43 @@ private:
printAttributeName(output, i.first);
output << " = ";
print(*i.second, depth + 1);
output << "; ";
output << ";";
attrsPrinted++;
}
decreaseIndent();
if (prettyPrint) {
output << "\n" << indent;
} else {
output << " ";
}
output << "}";
} else
} else {
output << "{ ... }";
}
}
bool shouldPrettyPrintList(std::span<Value * const> list)
{
if (!options.prettyPrint() || list.empty()) {
return false;
}
// Pretty-print lists with more than one item.
if (list.size() > 1) {
return true;
}
auto item = list[0];
if (!item) {
return true;
}
// Pretty-print single-item lists only if they contain nested
// structures.
auto itemType = item->type();
return itemType == nList || itemType == nAttrs || itemType == nThunk;
}
void printList(Value & v, size_t depth)
{
@ -304,9 +380,18 @@ private:
return;
}
output << "[ ";
if (depth < options.maxDepth) {
for (auto elem : v.listItems()) {
increaseIndent();
output << "[";
auto listItems = v.listItems();
auto prettyPrint = shouldPrettyPrintList(listItems);
for (auto elem : listItems) {
if (prettyPrint) {
output << "\n" << indent;
} else {
output << " ";
}
if (listItemsPrinted >= options.maxListItems) {
printElided(v.listSize() - listItemsPrinted, "item", "items");
break;
@ -317,13 +402,19 @@ private:
} else {
printNullptr();
}
output << " ";
listItemsPrinted++;
}
decreaseIndent();
if (prettyPrint) {
output << "\n" << indent;
} else {
output << " ";
}
else
output << "... ";
output << "]";
} else {
output << "[ ... ]";
}
}
void printFunction(Value & v)
@ -486,6 +577,7 @@ public:
{
attrsPrinted = 0;
listItemsPrinted = 0;
indent.clear();
if (options.trackRepeated) {
seen.emplace();

2
tests/functional/lang/eval-fail-bad-string-interpolation-4.err.exp
View file

@ -6,4 +6,4 @@ error:
| ^
10|
error: cannot coerce a set to a string: { a = { a = { a = { a = "ha"; b = "ha"; c = "ha"; d = "ha"; e = "ha"; f = "ha"; g = "ha"; h = "ha"; j = "ha"; }; «4294967295 attributes elided»}; «4294967294 attributes elided»}; «4294967293 attributes elided»}
error: cannot coerce a set to a string: { a = { a = { a = { a = "ha"; b = "ha"; c = "ha"; d = "ha"; e = "ha"; f = "ha"; g = "ha"; h = "ha"; j = "ha"; }; «4294967295 attributes elided» }; «4294967294 attributes elided» }; «4294967293 attributes elided» }

69
tests/functional/repl.sh
View file

@ -151,29 +151,86 @@ echo "$replResult" | grepQuiet -s afterChange
# Normal output should print attributes in lexicographical order non-recursively
testReplResponseNoRegex '
{ a = { b = 2; }; l = [ 1 2 3 ]; s = "string"; n = 1234; x = rec { y = { z = { inherit y; }; }; }; }
' '{ a = { ... }; l = [ ... ]; n = 1234; s = "string"; x = { ... }; }'
' \
'{
a = { ... };
l = [ ... ];
n = 1234;
s = "string";
x = { ... };
}
'
# Same for lists, but order is preserved
testReplResponseNoRegex '
[ 42 1 "thingy" ({ a = 1; }) ([ 1 2 3 ]) ]
' '[ 42 1 "thingy" { ... } [ ... ] ]'
' \
'[
42
1
"thingy"
{ ... }
[ ... ]
]
'
# Same for let expressions
testReplResponseNoRegex '
let x = { y = { a = 1; }; inherit x; }; in x
' '{ x = «repeated»; y = { ... }; }'
' \
'{
x = { ... };
y = { ... };
}
'
# The :p command should recursively print sets, but prevent infinite recursion
testReplResponseNoRegex '
:p { a = { b = 2; }; s = "string"; n = 1234; x = rec { y = { z = { inherit y; }; }; }; }
' '{ a = { b = 2; }; n = 1234; s = "string"; x = { y = { z = { y = «repeated»; }; }; }; }'
' \
'{
a = { b = 2; };
n = 1234;
s = "string";
x = {
y = {
z = {
y = «repeated»;
};
};
};
}
'
# Same for lists
testReplResponseNoRegex '
:p [ 42 1 "thingy" (rec { a = 1; b = { inherit a; inherit b; }; }) ([ 1 2 3 ]) ]
' '[ 42 1 "thingy" { a = 1; b = { a = 1; b = «repeated»; }; } [ 1 2 3 ] ]'
' \
'[
42
1
"thingy"
{
a = 1;
b = {
a = 1;
b = «repeated»;
};
}
[
1
2
3
]
]
'
# Same for let expressions
testReplResponseNoRegex '
:p let x = { y = { a = 1; }; inherit x; }; in x
' '{ x = «repeated»; y = { a = 1; }; }'
' \
'{
x = «repeated»;
y = { a = 1 };
}
'

8
tests/unit/libexpr/value/print.cc
View file

@ -720,7 +720,7 @@ TEST_F(ValuePrintingTests, ansiColorsAttrsElided)
vAttrs.mkAttrs(builder.finish());
test(vAttrs,
"{ one = " ANSI_CYAN "1" ANSI_NORMAL "; " ANSI_FAINT "«1 attribute elided»" ANSI_NORMAL "}",
"{ one = " ANSI_CYAN "1" ANSI_NORMAL "; " ANSI_FAINT "«1 attribute elided»" ANSI_NORMAL " }",
PrintOptions {
.ansiColors = true,
.maxAttrs = 1
@ -733,7 +733,7 @@ TEST_F(ValuePrintingTests, ansiColorsAttrsElided)
vAttrs.mkAttrs(builder.finish());
test(vAttrs,
"{ one = " ANSI_CYAN "1" ANSI_NORMAL "; " ANSI_FAINT "«2 attributes elided»" ANSI_NORMAL "}",
"{ one = " ANSI_CYAN "1" ANSI_NORMAL "; " ANSI_FAINT "«2 attributes elided»" ANSI_NORMAL " }",
PrintOptions {
.ansiColors = true,
.maxAttrs = 1
@ -757,7 +757,7 @@ TEST_F(ValuePrintingTests, ansiColorsListElided)
vList.bigList.size = 2;
test(vList,
"[ " ANSI_CYAN "1" ANSI_NORMAL " " ANSI_FAINT "«1 item elided»" ANSI_NORMAL "]",
"[ " ANSI_CYAN "1" ANSI_NORMAL " " ANSI_FAINT "«1 item elided»" ANSI_NORMAL " ]",
PrintOptions {
.ansiColors = true,
.maxListItems = 1
@ -770,7 +770,7 @@ TEST_F(ValuePrintingTests, ansiColorsListElided)
vList.bigList.size = 3;
test(vList,
"[ " ANSI_CYAN "1" ANSI_NORMAL " " ANSI_FAINT "«2 items elided»" ANSI_NORMAL "]",
"[ " ANSI_CYAN "1" ANSI_NORMAL " " ANSI_FAINT "«2 items elided»" ANSI_NORMAL " ]",
PrintOptions {
.ansiColors = true,
.maxListItems = 1