From 94e8af18b60eacfd397b288a7996fc114b853530 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <koszko@koszko.org>
Date: Wed, 19 Oct 2022 12:00:35 +0200
Subject: [builder][server][proxy] for make targets that spawn a shell, modify
 bash prompt to indicate the enviroment is active

---
 Makefile | 34 +++++++++++++++++++++++++++++++---
 bashrc   | 15 +++++++++++++++
 2 files changed, 46 insertions(+), 3 deletions(-)
 create mode 100644 bashrc

diff --git a/Makefile b/Makefile
index 80480ee..1cfdd82 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,14 @@ DETERMINISTIC_TAR = $(GUIX_TM) shell tar -- tar                             \
 	--owner=0 --group=0 --numeric-owner                                 \
 	--pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime
 
+DETERMINE_USER_SHELL_TO_USE =                    \
+	case "$$SHELL" in                        \
+		?*)                              \
+			SHELL_TO_USE="$$SHELL";; \
+		*)                               \
+			SHELL_TO_USE="/bin/sh";; \
+	esac
+
 wheel:
 	$(GUIX_DEVSHELL) python3 -m build
 
@@ -64,11 +72,31 @@ release: dist
 	@printf "Generated binary release tarball for $$(arch) in:\n"
 	@printf "./haketilo-and-hydrilla-bin-$(GET_VER)-$$(arch).tar.gz\n"
 
+# If using bash, modify the prompt to indicate that the environment is active.
 shell:
-	$(GUIX_DEVSHELL) || true
-
+	$(DETERMINE_USER_SHELL_TO_USE);	                            \
+	case "$$SHELL_TO_USE" in                                    \
+		*bash*)                                             \
+			HYDRILLA_SHELL_NAME=hydrilla-dev            \
+				$(GUIX_DEVSHELL) "$$SHELL_TO_USE"   \
+				--rcfile ./bashrc || true;;         \
+		*)                                                  \
+			$(GUIX_DEVSHELL) "$$SHELL_TO_USE" || true;; \
+	esac
+
+# Modify prompt for bash, like above.
 shell-with-haketilo: dist
-	$(GUIX_TM) shell -f guix.scm -- || true
+	$(DETERMINE_USER_SHELL_TO_USE);	                                     \
+	case "$$SHELL_TO_USE" in                                             \
+		*bash*)                                                      \
+			HYDRILLA_SHELL_NAME=hydrilla                         \
+				$(GUIX_TM) shell                             \
+				--rebuild-cache -f guix.scm --               \
+				"$$SHELL_TO_USE" --rcfile ./bashrc || true;; \
+		*)                                                           \
+			$(GUIX_TM) shell --rebuild-cache -f guix.scm --      \
+				|| true;;                                    \
+	esac
 
 catalogs:
 	$(GUIX_DEVSHELL) python3 setup.py compile_catalog
diff --git a/bashrc b/bashrc
new file mode 100644
index 0000000..1d0047c
--- /dev/null
+++ b/bashrc
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+if [ -r /etc/bash.bashrc ]; then
+    source /etc/bash.bashrc
+fi
+
+if [ -r ~/.bashrc ]; then
+    source ~/.bashrc
+fi
+
+export PS1="$PS1($HYDRILLA_SHELL_NAME)\$ "
-- 
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