From 67ca8e5e889d289f9758f303b67dbcaf99fcd742 Mon Sep 17 00:00:00 2001
From: pacien
Date: Sun, 13 Nov 2022 20:02:01 +0100
Subject: mkDevShell: more readable and coloured info prints

---
 lib/mk-dev-shell.nix | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/lib/mk-dev-shell.nix b/lib/mk-dev-shell.nix
index 0e2a265..87b9dbb 100644
--- a/lib/mk-dev-shell.nix
+++ b/lib/mk-dev-shell.nix
@@ -7,29 +7,33 @@
 with pkgs.lib;
 
 let
+  mapAttrsToLines = mapping: attrs:
+    pkgs.lib.concatStringsSep "\n" (pkgs.lib.mapAttrsToList mapping attrs);
+
   exportEnvVar = k: v: ''
     export ${escapeShellArg k}="${v}"
   '';
 
-  exportEnvVarsHook = envVars: ''
-    ${pkgs.lib.concatStringsSep "\n" (
-      pkgs.lib.mapAttrsToList exportEnvVar envVars
-    )}
-  '';
+  exportEnvVarsHook = mapAttrsToLines exportEnvVar;
+
+  fmt = rec {
+    codeBlock = code: text: ''"\e[${code}m"${text}"\e[0m"'';
+    keyword = codeBlock "1;36";
+    section = codeBlock "4;35";
+    printSectionTitle = title: ''echo -e "\n\n"${section title}"\n"'';
+  };
 
   printEnvVar = k: v: ''
-    echo ${escapeShellArg k}=${escapeShellArg v}
+    echo -e ${fmt.keyword (escapeShellArg "$" + k)}: ${escapeShellArg v}
   '';
 
   printEnvVarsHook = envVars: ''
-    echo -e "\nDEVSHELL ENVIRONMENT VARIABLES:"
-    ${pkgs.lib.concatStringsSep "\n" (
-      pkgs.lib.mapAttrsToList printEnvVar envVars
-    )}
+    ${fmt.printSectionTitle "DEVSHELL ENVIRONMENT VARIABLES"}
+    ${mapAttrsToLines printEnvVar envVars}
   '';
 
   printToolsHook = tools: ''
-    echo -e "\nDEVSHELL COMMANDS:"
+    ${fmt.printSectionTitle "DEVSHELL TOOLS"}
     ls "${pkgs.symlinkJoin { name = "env"; paths = tools; }}/bin"
   '';
 
@@ -46,6 +50,7 @@ in pkgs.mkShell {
 
     ${optionalString (envVars != {}) (printEnvVarsHook envVars)}
     ${optionalString (tools != []) (printToolsHook tools)}
+    echo
 
     ${if (shell != null) then shell else startUserShellHook}
     exit $?
-- 
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