feat(package): hemar: some stages of parsing

test/package/default.nix

@@ -1 +1,3 @@
-{ system, inputs, self, pkgs }:   (import ./migrator { inherit system inputs self pkgs; })
+{ system, inputs, self, pkgs }:   
+  (import ./migrator { inherit system inputs self pkgs; }) //
+  (import ./hemar    { inherit system inputs self pkgs; })

test/package/hemar/default.nix

@@ -0,0 +1,48 @@
+{ inputs, self, pkgs, system, ... }: let 
+  lib = inputs.nixpkgs.lib;
+
+  # turn anything under ./test into a derivation that exposes $out/run.sh
+  mkTestDrv = name: type:
+    if type == "directory" then
+      pkgs.runCommand "test-${name}" {} ''
+        if ! [ -f ${./test + "/${name}" + /run.sh} ]; then
+          echo no run.sh in test/${name}
+	  exit 1
+        fi
+
+        mkdir -p "$out"
+        cp -r ${./test + "/${name}"}/* "$out/"
+        chmod +x "$out/run.sh"
+      ''
+    else if lib.hasSuffix ".sh" name then
+      pkgs.runCommand "test-${lib.removeSuffix ".sh" name}" {} ''
+        mkdir -p "$out"
+        install -Dm755 ${./test + "/${name}"} "$out/run.sh"
+      ''
+    else
+      null;
+
+  testDir = builtins.readDir ./test;
+
+  # attrset: testName -> drv with run.sh
+  testDrvs =
+    lib.mapAttrs' (n: v:
+      lib.nameValuePair (lib.removeSuffix ".sh" n) v
+    ) (lib.filterAttrs (_: v: v != null)
+      (lib.mapAttrs (n: t: mkTestDrv n t) testDir));
+
+  hemar = self.packages.${system}.hemar;
+  mkPgTest = testName: testDrv: pkgs.runCommand "hemar-test-${testName}"
+  {
+    nativeBuildInputs = [ pkgs.coreutils pkgs.gnugrep pkgs.gnused ];
+    buildInputs = [ hemar pkgs.yq-go ];
+  } ''
+    ${builtins.readFile self.legacyPackages.${system}.helpers.posix-shell.log}
+    test=${testDrv}
+    ${builtins.readFile ./lauch.sh}
+
+    # success marker for Nix
+    # shellcheck disable=SC2154
+    mkdir -p "$out"
+  '';
+in lib.mapAttrs (name: drv: mkPgTest name drv) testDrvs

test/package/hemar/lauch.sh

@@ -0,0 +1,24 @@
+#!/bin/dash
+
+# $test - test and assertion file
+
+json_diff() {
+    temp1=$(mktemp)
+    temp2=$(mktemp)
+
+    yq -I=0 -o=j -n "$1" >"$temp1"
+    yq -I=0 -o=j -n "$2" >"$temp2"
+
+    if ! diff -q "$temp1" "$temp2"; then
+	log error "$(yq -o=j -n "$1")" and "$(yq -o=j -n "$2")"
+	exit 1
+    fi
+}
+
+# run test
+mkdir './test'
+# shellcheck disable=SC2154
+cp -r "$test"/* './test/'
+# shellcheck disable=SC2164
+cd './test'
+. './run.sh'

test/package/hemar/test/first.sh

@@ -0,0 +1,32 @@
+answer="$(echo 'some text' | hemar -c)"
+
+expected="$(printf '[
+  {
+    "type":  "text",
+    "value": "some text"
+  }
+]')"
+
+json_diff "$answer" "$expected"
+
+answer="$(echo 'some [] {} text' | hemar -c)"
+
+expected="$(printf '[
+  {
+    "type":  "text",
+    "value": "some [] {} text"
+  }
+]')"
+
+json_diff "$answer" "$expected"
+
+answer="$(echo 'some {' | hemar -c)"
+
+expected="$(printf '[
+  {
+    "type":  "text",
+    "value": "some {"
+  }
+]')"
+
+json_diff "$answer" "$expected"