gnbug: Add show sub-command.

* gnbug: Import (rnrs io ports).
(main): Add show sub-command.
(gnbug-show): New function.
* README.gmi (gnbug): Document the show sub-command.

2 files changed, 14 insertions, 1 deletions

diff --git a/README.gmi b/README.gmi
index b08ae8b..b400a8d 100644
--- a/README.gmi
+++ b/README.gmi
@@ -38,6 +38,11 @@ Only list issues assigned to pjotrp.
 ./gnbug list --assigned=pjotrp
 ```
 
+Print an issue, say issue 7, on the command line.
+```
+./gnbug show 7
+```
+
 Edit an issue, say issue 9. This opens the relevant gemtext file in your favourite editor as defined by the EDITOR environment variable.
 ```
 ./gnbug edit 9
diff --git a/gnbug b/gnbug
index 02966ba..2b42111 100755
--- a/gnbug
+++ b/gnbug
@@ -2,6 +2,7 @@
 !#
 
 (import (rnrs hashtables)
+        (rnrs io ports)
         (srfi srfi-9)
         (srfi srfi-26)
         (srfi srfi-37)
@@ -238,13 +239,20 @@ export EDITOR=emacsclient"))
           (issue-file (list-ref (issues)
                                 (1- (string->number issue-number))))))
 
+(define (gnbug-show issue-number)
+  (put-string (current-output-port)
+              (call-with-input-file (issue-file (list-ref (issues)
+                                                          (1- (string->number issue-number))))
+                get-string-all)))
+
 (define main
   (match-lambda*
     ((_ command args ...)
      (apply (match command
               ("news" gnbug-news)
               ("list" gnbug-list)
-              ("edit" gnbug-edit))
+              ("edit" gnbug-edit)
+              ("show" gnbug-show))
             args))
     ;; gnbug is an alias for `gnbug list'
     ((_)