build: switch Makefile to eask, wire up undercover coverage

I wanted a coverage number, so I added an Eask file declaring the runtime dep (xterm-color) plus three dev deps (undercover, package-lint, elisp-lint). The Makefile now runs every test and lint recipe through `eask emacs`. That drops the hand-rolled `(require 'package)` + `add-to-list 'package-archives` boilerplate that was duplicated across six recipes.

I added a `make deps` target that runs `eask install-deps --dev`. I also added a `make coverage` target that loads `tests/run-coverage-file.el` before each unit-test file. Undercover instruments the three source files first, then the test loads pick up the instrumented copy. Per-file results merge into `.coverage/simplecov.json` in simplecov format.

I expanded `validate-parens` and `compile` to cover all three source files instead of just `wttrin.el`. Lint stays scoped to the main file for now.

Coverage right now is 84% overall: wttrin.el 92%, wttrin-geolocation.el 100%, wttrin-debug.el 27%. The debug module is low because only the integration test exercises it. The coverage loop runs unit tests only.

1 files changed, 24 insertions, 0 deletions

diff --git a/Eask b/Eask
new file mode 100644
index 0000000..eae1b17
--- /dev/null
+++ b/Eask
@@ -0,0 +1,24 @@
+;; -*- mode: eask; lexical-binding: t -*-
+
+(package "wttrin"
+         "0.3.2"
+         "Emacs Frontend for Service wttr.in")
+
+(website-url "https://github.com/cjennings/emacs-wttrin")
+(keywords "weather" "wttrin" "games")
+
+(package-file "wttrin.el")
+
+(files "wttrin.el" "wttrin-debug.el" "wttrin-geolocation.el")
+
+(source "gnu")
+(source "nongnu")
+(source "melpa")
+
+(depends-on "emacs" "24.4")
+(depends-on "xterm-color")
+
+(development
+ (depends-on "undercover")
+ (depends-on "package-lint")
+ (depends-on "elisp-lint"))