[O] [BABEL,PATCH] call awk with no input

[Litvinov Sergey]

Please consider this tiny fix to execute awk program with no input.
Example with gawk:
gawk --posix 'BEGIN {print 42}'

I also added some tests for ob-awk.

>From 868fa910254c48752801cdc7849c3eb4db63f811 Mon Sep 17 00:00:00 2001
From: Litvinov Sergey <address@hidden>
Date: Sun, 24 Jul 2011 12:28:35 +0200
Subject: [PATCH] Awk can be called with no in-file: and no :stdin

---
 lisp/ob-awk.el                   |    6 +---
 testing/README.org               |    1 +
 testing/examples/ob-awk-test.in  |    2 +
 testing/examples/ob-awk-test.org |   39 ++++++++++++++++++++++++++++++++++++++
 testing/lisp/test-ob-awk.el      |   19 ++++++++++++++++++
 5 files changed, 63 insertions(+), 4 deletions(-)
 create mode 100644 testing/examples/ob-awk-test.in
 create mode 100644 testing/examples/ob-awk-test.org
 create mode 100644 testing/lisp/test-ob-awk.el

diff --git a/lisp/ob-awk.el b/lisp/ob-awk.el
index d5098bc..cfed04a 100644
--- a/lisp/ob-awk.el
+++ b/lisp/ob-awk.el
@@ -26,8 +26,7 @@
 
 ;;; Commentary:
 
-;; Babel's awk support relies on two special header argument one of
-;; which is required to pass data to the awk process.
+;; Babel's awk can use special header argument:
 ;; 
 ;; - :in-file takes a path to a file of data to be processed by awk
 ;;   
@@ -89,11 +88,10 @@ called by `org-babel-execute-src-block'"
              (with-temp-file tmp (insert results))
              (org-babel-import-elisp-from-file tmp)))))
       (cond
-       (in-file (org-babel-eval cmd ""))
        (stdin (with-temp-buffer
                (call-process-shell-command cmd stdin (current-buffer))
                (buffer-string)))
-       (t (error "ob-awk: must specify either :in-file or :stdin"))))
+       (t (org-babel-eval cmd ""))))
      (org-babel-pick-name
       (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
      (org-babel-pick-name
diff --git a/testing/README.org b/testing/README.org
index 3cc0487..2f16a55 100644
--- a/testing/README.org
+++ b/testing/README.org
@@ -78,6 +78,7 @@ First tangle this file out to your desktop.
   (org-id-update-id-locations
    (list (concat org-dir "/testing/examples/babel.org")
          (concat org-dir "/testing/examples/normal.org")
+         (concat org-dir "/testing/examples/ob-awk-test.org")
          (concat org-dir "/testing/examples/ob-fortran-test.org")
          (concat org-dir "/testing/examples/link-in-heading.org")
          (concat org-dir "/testing/examples/links.org")))
diff --git a/testing/examples/ob-awk-test.in b/testing/examples/ob-awk-test.in
new file mode 100644
index 0000000..c38382d
--- /dev/null
+++ b/testing/examples/ob-awk-test.in
@@ -0,0 +1,2 @@
+ # an input file for awk test
+15
\ No newline at end of file
diff --git a/testing/examples/ob-awk-test.org b/testing/examples/ob-awk-test.org
new file mode 100644
index 0000000..7f51772
--- /dev/null
+++ b/testing/examples/ob-awk-test.org
@@ -0,0 +1,39 @@
+#+Title: a collection of examples for ob-awk tests
+#+OPTIONS: ^:nil
+
+* Simple tests
+  :PROPERTIES:
+  :ID:       9e998b2a-3581-43fe-b26d-07d3c507b86a
+  :END:
+Run without input stream
+#+begin_src awk :ouput silent :results silent
+  BEGIN {
+      print 42
+  }
+#+end_src
+
+Use a code block ouput as an input
+#+begin_src awk  :stdin genseq :results silent
+  {
+      print 42+$1
+  }
+#+end_src
+
+Use input file
+#+srcname: genfile
+#+begin_src awk  :in-file ob-awk-test.in :results silent
+    $0~/[\t]*#/{
+        # skip comments 
+        next
+    }
+    { 
+        print $1*10
+    }
+#+end_src
+
+* Input data generators
+A code block to generate input stream
+#+srcname: genseq
+#+begin_src emacs-lisp :results silent
+(print "1")
+#+end_src
diff --git a/testing/lisp/test-ob-awk.el b/testing/lisp/test-ob-awk.el
new file mode 100644
index 0000000..018dec4
--- /dev/null
+++ b/testing/lisp/test-ob-awk.el
@@ -0,0 +1,19 @@
+(require 'ob-awk)
+
+(ert-deftest ob-awk/input-none ()
+  "Test with no input file"
+  (org-test-at-id "9e998b2a-3581-43fe-b26d-07d3c507b86a"
+    (org-babel-next-src-block)
+    (should (= 42 (org-babel-execute-src-block)))))
+
+(ert-deftest ob-awk/input-src-block ()
+  "Test a code block as an input"
+  (org-test-at-id "9e998b2a-3581-43fe-b26d-07d3c507b86a"
+    (org-babel-next-src-block 2)
+    (should (= 43 (org-babel-execute-src-block)))))
+
+(ert-deftest ob-awk/input-src-block ()
+  "Test a code block as an input"
+  (org-test-at-id "9e998b2a-3581-43fe-b26d-07d3c507b86a"
+    (org-babel-next-src-block 3)
+    (should (= 150 (org-babel-execute-src-block)))))
-- 
1.7.4.1