Changes to dockerfile + more intricate .emacs file

.gitea/workflows/build-image.yaml

@@ -12,4 +12,5 @@ jobs:
         run: |
           cd ${{ gitea.workspace }}
           docker build . -t emacs-c
-      
+      #- name: Upload image to gitea package repository.
+        

Dockerfile

@@ -1,10 +1,21 @@
 FROM debian
 
+# install emacs + clang + clangd as LSP.
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt update && \
-    apt install -y emacs clang clangd && \
-    apt clean all
+    apt install -y emacs build-essential git make cmake clang clang-format clangd && \
+    apt clean all && \
+    rm -rf /var/lib/apt/lists/*
+
+# copy emacs config
+COPY emacs-init /root/.emacs
+
+# install emacs packages by running once beforehand,
+# so we don't have to that every start-up
+RUN emacs --batch -l /root/.emacs \
+    --eval "(package-refresh-contents)" \
+    --eval "(package-install-selected-packages)"
 
 
-ENTRYPOINT ["/bin/emacs" "-nw"]
+ENTRYPOINT ["/bin/emacs", "-nw"]

emacs-init

@@ -1,8 +1,48 @@
-;; Require Emacs' package functionality
+;; Package management
 (require 'package)
-
-;; Add the Melpa repository to the list of package sources
-(add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/") t)
-
-;; Initialise the package system.
+(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
 (package-initialize)
+
+;; Install use-package if missing
+(unless (package-installed-p 'use-package)
+  (package-refresh-contents)
+  (package-install 'use-package))
+
+;; Core setup
+(setq inhibit-startup-screen t)
+(electric-pair-mode 1)
+(show-paren-mode 1)
+
+;; Packages
+(use-package eglot
+  :ensure t
+  :hook ((c-mode c++-mode) . eglot-ensure))
+
+(use-package company
+  :ensure t
+  :config
+  (global-company-mode)
+  (setq company-idle-delay 0.1))
+
+(use-package flycheck
+  :ensure t
+  :init (global-flycheck-mode))
+
+(use-package clang-format
+  :ensure t
+  :bind ("C-c f" . clang-format-buffer))
+
+(use-package projectile
+  :ensure t
+  :init (projectile-mode))
+
+(use-package which-key
+  :ensure t
+  :init (which-key-mode))
+
+;; C-specific settings
+(add-hook 'c-mode-hook
+          (lambda ()
+            (setq c-basic-offset 4)
+            (setq tab-width 4)
+            (setq indent-tabs-mode nil)))