Add comment on setting a pager

Ledger's command line does not respect any pager related flag (e.g.
--no-pager). So the only resort is to set a pager ourselves being /bin/cat.

comint-ledger.el

@@ -49,8 +49,16 @@ The LEDGER-FILE can be configured through the `comint-ledger-file-path'
 variable, otherwise a prompt will appear to select a file."
   (interactive (list (or comint-ledger-file-path
                          (read-file-name "Ledger file: "))))
-  (let* ((ledger-program comint-ledger-cli-path)
-         (ledger-file-arguments (list "--no-pager" "-f" ledger-file))
+  (let* (;; The ledger command interpreter ignores --no-pager, so if
+         ;; no pager is set, less(1) is used. This is suboptimal
+         ;; inside an Emacs buffer, so set the pager to cat(1)
+         ;; instead.
+         (cat-executable (executable-find "cat"))
+         (process-environment (append process-environment
+                                      (list (concat "PAGER=" cat-executable))))
+
+         (ledger-program comint-ledger-cli-path)
+         (ledger-file-arguments (list "-f" ledger-file))
          (ledger-arguments (append ledger-file-arguments comint-ledger-cli-arguments))
          (buffer (get-buffer-create comint-ledger-buffer-name))
          (proc-alive (comint-check-proc buffer)))