From d2ec64bc29f9d7d4ef241baa0d4597504cb07e13 Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Wed, 21 Dec 2022 00:29:34 +0100
Subject: cmk company completion draft

---
 elisp/cmk.el | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

(limited to 'elisp')

diff --git a/elisp/cmk.el b/elisp/cmk.el
index df424ad..6023cf0 100644
--- a/elisp/cmk.el
+++ b/elisp/cmk.el
@@ -21,6 +21,8 @@
 (require 'subr-x)
 (require 'cl-lib)
 (require 'dash)
+(require 'company)
+(require 'csv-mode)
 
 (defun cmk-state-coloring (state)
   "Font color for numeric STATE input as string."
@@ -128,14 +130,63 @@ Default is  \"%Y-%m-%d %H:%M\"."
     (setq tabulated-list-entries (cmk-parse-rows (process-buffer cmks) tabulated-list-format))
     (tabulated-list-print 'remember)))
 
+(defun cmk-timestamp-eldoc-documentation ()
+  (when-let ((number (thing-at-point 'number)))
+    (format-time-string "%Y-%m-%d %H:%M" (seconds-to-time number))))
+
+(defconst cmk-livestatus-headers
+  '("Filter" "Columns" "Stats" "Limit" "ColumnHeaders" "OutputFormat"))
+
 (define-derived-mode cmk-livestatus-mode prog-mode "livestatus"
   "Major mode for viewing journalctl output."
+  (add-function :before-until (local 'eldoc-documentation-function)
+                #'cmk-timestamp-eldoc-documentation)
+  ;; (setq-local company-backends (cons 'company-cmk-lq company-backends))
+  ;; (setq-local completion-at-point-functions '(cmk-lq-capf))
+  (add-hook 'completion-at-point-functions 'cmk-lq-capf nil 'local)
   ;; code for syntax highlighting
   (setq font-lock-defaults `(((,(rx bol "GET" eow) . font-lock-keyword-face)
                               (,(rx word-start (or "hosts" "services")  word-end) . font-lock-constant-face)
-                              (,(rx bol (or "Filter" "Columns" "Stats" "Limit") ":" whitespace) . font-lock-function-name-face)
+                              (,(concat "^" (regexp-opt cmk-livestatus-headers 'words) ":[[:space:]]") . font-lock-function-name-face)
                               (,(rx bol (or "And" "Or" "Negate") ":" whitespace) . font-lock-keyword-face)
                               (,(rx whitespace (or "~" "=" "=~" "~~" "<" ">" "<=" ">=") whitespace) . font-lock-keyword-face)))))
+(defun cmk-custom-livestatus-query ()
+  (interactive)
+  (let ((query cmk-livestatus-query)
+        (edit-buffer (get-buffer-create "*LQ*")))
+    (with-current-buffer edit-buffer
+      (cmk-livestatus-mode)
+      (if (string-blank-p query) (insert "GET ") (insert query))
+      (local-set-key "\C-c\C-c"
+                     (lambda ()
+                       (interactive)
+                       (let ((new-query (-> (buffer-string) (string-trim) (concat "\n\n"))))
+                         (kill-buffer)
+                         (let ((cmk (cmk-livestatus-query new-query)))
+                           (switch-to-buffer (process-buffer cmk))
+                           (setq csv-separators '(";")
+                                 csv-separator-regexp "[;]"
+                                 csv-separator-chars '(59))
+                           (csv-align-mode)
+                           (setq-local cmk-livestatus-query new-query))))))
+    (switch-to-buffer edit-buffer)))
+
+(defun company-cmk-lq (command &optional arg &rest ignored)
+  (interactive (list 'interactive))
+  (cl-case command
+    (interactive (company-begin-backend 'company-cmk-lq))
+    (prefix (company-grab-word))
+    (candidates (cl-loop for header in cmk-livestatus-headers
+                         when (string-prefix-p arg header t) collect header))
+    (meta (format "This value is named %s" arg))))
+
+(defun cmk-lq-capf ()
+  (when (looking-back (rx bol (+ alpha)) 1)
+    (list (match-beginning 0)
+          (match-end 0)
+          (cl-loop for header in cmk-livestatus-headers
+                   when (string-prefix-p (match-string-no-properties 0) header t)
+                   collect (concat header ": ")))))
 
 (defun cmk-edit-lq (buffer)
   "Open window to edit the livestatus query of current BUFFER."
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