mc: add midnight commander module (#7225)

tests/modules/programs/mc/basic-configuration

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+[Panels]
+show_dot_files=false

tests/modules/programs/mc/basic-configuration.nix

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+{ config, lib, ... }:
+
+{
+  programs.mc = {
+    enable = true;
+
+    settings = {
+      Panels = {
+        show_dot_files = false;
+      };
+    };
+
+    keymapSettings = {
+      panel = {
+        Up = "up;ctrl-k";
+      };
+    };
+
+    extensionSettings = {
+      EPUB = {
+        Shell = ".epub";
+        Open = "fbreader %f &";
+      };
+    };
+
+    panelsSettings = {
+      Dirs = {
+        current_is_left = false;
+        other_dir = "/home";
+      };
+    };
+
+    fileHighlightSettings = {
+      lua = {
+        extensions = "lua;luac";
+      };
+    };
+  };
+
+  nmt.script = ''
+
+    mcFolder="home-files/.config/mc"
+
+    assertFileExists "$mcFolder/ini"
+    assertFileExists "$mcFolder/mc.keymap"
+    assertFileExists "$mcFolder/mc.ext.ini"
+    assertFileExists "$mcFolder/panels.ini"
+    assertFileExists "$mcFolder/filehighlight.ini"
+
+    assertFileContent \
+      "$mcFolder/ini" \
+      ${./basic-configuration}
+    assertFileContent \
+      "$mcFolder/mc.keymap" \
+      ${./mc.keymap}
+    assertFileContent \
+      "$mcFolder/mc.ext.ini" \
+      ${./mc.ext.ini}
+    assertFileContent \
+      "$mcFolder/panels.ini" \
+      ${./panels.ini}
+    assertFileContent \
+      "$mcFolder/filehighlight.ini"  \
+      ${./filehighlight.ini}
+  '';
+}

tests/modules/programs/mc/default.nix

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+{ mc-basic-configuration = ./basic-configuration.nix; }

tests/modules/programs/mc/filehighlight.ini

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+[lua]
+extensions=lua;luac

tests/modules/programs/mc/mc.ext.ini

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+[EPUB]
+Open=fbreader %f &
+Shell=.epub

tests/modules/programs/mc/mc.keymap

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+[panel]
+Up=up;ctrl-k

tests/modules/programs/mc/panels.ini

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+[Dirs]
+current_is_left=false
+other_dir=/home