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:print strings directly in nix repl

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Strings are now printed directly when evaluated by `:print`, rather than
escaped. This makes it easier to debug multi-line strings or strings
containing quotes, like the results of `builtins.readFile`,
`lib.toShellArg`, and so on.

```
nix-repl> "cuppy\ndog\ncity"
"cuppy\ndog\ncity"

nix-repl> :p "cuppy\ndog\ncity"
cuppy
dog
city
```
This commit is contained in:
Rebecca Turner 2024-03-09 18:13:08 -08:00
parent ac730622e8
commit d859d6c434
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1 changed files with 6 additions and 1 deletions
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7
src/libcmd/repl.cc
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@ -542,6 +542,7 @@ ProcessLineResult NixRepl::processLine(std::string line)
<< " :l, :load <path> Load Nix expression and add it to scope\n"
<< " :lf, :load-flake <ref> Load Nix flake and add it to scope\n"
<< " :p, :print <expr> Evaluate and print expression recursively\n"
<< " Strings are printed directly, without escaping.\n"
<< " :q, :quit Exit nix-repl\n"
<< " :r, :reload Reload all files\n"
<< " :sh <expr> Build dependencies of derivation, then start\n"
@ -749,7 +750,11 @@ ProcessLineResult NixRepl::processLine(std::string line)
else if (command == ":p" || command == ":print") {
Value v;
evalString(arg, v);
printValue(std::cout, v);
if (v.type() == nString) {
std::cout << v.string_view();
} else {
printValue(std::cout, v);
}
std::cout << std::endl;
}