avoid markdown which the repl's :doc cannot handle

code blocks, if not surrounded by empty lines, have the language
tags (in these cases, always `nix`) show up in the output of :doc.

for example:

  nix-repl> :doc builtins.parseFlakeRef
  Synopsis: builtins.parseFlakeRef flake-ref

    Parse a flake reference, and return its exploded form.

    For example: nix builtins.parseFlakeRef
    "github:NixOS/nixpkgs/23.05?dir=lib"  evaluates to: nix { dir =
    "lib"; owner = "NixOS"; ref = "23.05"; repo = "nixpkgs"; type =
    "github"; }

is now instead:
  nix-repl> :doc builtins.parseFlakeRef
  Synopsis: builtins.parseFlakeRef flake-ref

    Parse a flake reference, and return its exploded form.

    For example:

      | builtins.parseFlakeRef "github:NixOS/nixpkgs/23.05?dir=lib"

    evaluates to:

      | { dir = "lib"; owner = "NixOS"; ref = "23.05"; repo = "nixpkgs"; type = "github"; }

(closes #225)

Change-Id: I0741aeb1006a5376bb2f663d202c7a4da7e38cce

2 files changed, 8 insertions, 0 deletions

diff --git a/src/libexpr/flake/flake.cc b/src/libexpr/flake/flake.cc
index e573e53b4..4cc2ab43b 100644
--- a/src/libexpr/flake/flake.cc
+++ b/src/libexpr/flake/flake.cc
@@ -823,10 +823,13 @@ static RegisterPrimOp r3({
       Parse a flake reference, and return its exploded form.
 
       For example:
+
       ```nix
       builtins.parseFlakeRef "github:NixOS/nixpkgs/23.05?dir=lib"
       ```
+
       evaluates to:
+
       ```nix
       { dir = "lib"; owner = "NixOS"; ref = "23.05"; repo = "nixpkgs"; type = "github"; }
       ```
@@ -875,12 +878,15 @@ static RegisterPrimOp r4({
       Convert a flake reference from attribute set format to URL format.
 
       For example:
+
       ```nix
       builtins.flakeRefToString {
         dir = "lib"; owner = "NixOS"; ref = "23.05"; repo = "nixpkgs"; type = "github";
       }
       ```
+
       evaluates to
+
       ```nix
       "github:NixOS/nixpkgs/23.05?dir=lib"
       ```
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 77601e457..33a2688f1 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1871,11 +1871,13 @@ static RegisterPrimOp primop_outputOf({
       *`derivation reference`* must be a string that may contain a regular store path to a derivation, or may be a placeholder reference. If the derivation is produced by a derivation, you must explicitly select `drv.outPath`.
       This primop can be chained arbitrarily deeply.
       For instance,
+
       ```nix
       builtins.outputOf
         (builtins.outputOf myDrv "out)
         "out"
       ```
+
       will return a placeholder for the output of the output of `myDrv`.
 
       This primop corresponds to the `^` sigil for derivable paths, e.g. as part of installable syntax on the command line.