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[gnuastro-commits] master d5a2a10: Arithmetic: new --onedonstdout option

From: Mohammad Akhlaghi
Subject: [gnuastro-commits] master d5a2a10: Arithmetic: new --onedonstdout option to print 1D outputs on stdout
Date: Fri, 16 Aug 2019 01:47:23 -0400 (EDT)

branch: master
commit d5a2a104f414a5538422193929aaa4c54e924adc
Author: Mohammad Akhlaghi <address@hidden>
Commit: Mohammad Akhlaghi <address@hidden>

    Arithmetic: new --onedonstdout option to print 1D outputs on stdout
    Until now, if you wanted to use the outputs of the `unique' operator for
    example in your shell script, it was necessary to save it as a file, then
    read that file which is annoying.
    With this commit, Arithmetic has a new `--onedonstdout' operator for this:
    when it is called, any 1D output will be written directly to the standard
 NEWS                        |  4 ++++
 bin/arithmetic/args.h       | 13 +++++++++++++
 bin/arithmetic/arithmetic.c |  3 ++-
 bin/arithmetic/main.h       |  1 +
 bin/arithmetic/ui.h         |  3 ++-
 doc/gnuastro.texi           | 14 +++++++++++---
 6 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/NEWS b/NEWS
index 7baa5d2..7f58e34 100644
--- a/NEWS
+++ b/NEWS
@@ -7,6 +7,10 @@ See the end of the file for license conditions.
 ** New features
+  Arithmetic:
+   --onedonstdout: when the output is one-dimensional, print the values on
+     the standard output, not into a file.
    --lineatz: return the observed wavelength of a line if it was emitted at
      the redshift given to CosmicCalculator. You can either use known line
diff --git a/bin/arithmetic/args.h b/bin/arithmetic/args.h
index 987148d..788a818 100644
--- a/bin/arithmetic/args.h
+++ b/bin/arithmetic/args.h
@@ -85,6 +85,19 @@ struct argp_option program_options[] =
+    {
+      "onedonstdout",
+      0,
+      0,
+      "Write 1D output on stdout, not in a table.",
+      &p->onedonstdout,
+    },
diff --git a/bin/arithmetic/arithmetic.c b/bin/arithmetic/arithmetic.c
index 2a370c5..6935036 100644
--- a/bin/arithmetic/arithmetic.c
+++ b/bin/arithmetic/arithmetic.c
@@ -1247,7 +1247,8 @@ reversepolish(struct arithmeticparams *p)
          will be freed while freeing `data'. */
       if(data->ndim==1 && p->onedasimage==0)
-        gal_table_write(data, NULL, p->cp.tableformat, p->cp.output,
+        gal_table_write(data, NULL, p->cp.tableformat,
+                        p->onedonstdout ? NULL : p->cp.output,
                         "ARITHMETIC", 0);
         gal_fits_img_write(data, p->cp.output, NULL, PROGRAM_NAME);
diff --git a/bin/arithmetic/main.h b/bin/arithmetic/main.h
index 92c9e9f..af1b9a0 100644
--- a/bin/arithmetic/main.h
+++ b/bin/arithmetic/main.h
@@ -81,6 +81,7 @@ struct arithmeticparams
   gal_data_t       refdata;  /* Container for information of the data.  */
   char          *globalhdu;  /* Single HDU for all inputs.              */
   uint8_t      onedasimage;  /* Write 1D outputs as an image not table. */
+  uint8_t     onedonstdout;  /* Write 1D outputs on stdout, not table.  */
   gal_data_t        *named;  /* List containing variables.              */
   size_t      tokencounter;  /* Counter for finding place in tokens.    */
diff --git a/bin/arithmetic/ui.h b/bin/arithmetic/ui.h
index 37bf97d..6bbe04c 100644
--- a/bin/arithmetic/ui.h
+++ b/bin/arithmetic/ui.h
@@ -32,7 +32,7 @@ along with Gnuastro. If not, see 
 /* Available letters for short options:
-   a b c d e f i j k l m n p r s t u v x y z
+   a b c d e f i j k l m n p r t u v x y z
    A B C E G H J L Q R X Y
 enum option_keys_enum
@@ -40,6 +40,7 @@ enum option_keys_enum
   /* With short-option version. */
   UI_KEY_GLOBALHDU       = 'g',
   UI_KEY_WCSFILE         = 'w',
   UI_KEY_WCSHDU          = 'W',
diff --git a/doc/gnuastro.texi b/doc/gnuastro.texi
index d9bb8bd..f39fbe2 100644
--- a/doc/gnuastro.texi
+++ b/doc/gnuastro.texi
@@ -13267,8 +13267,9 @@ operand. The unique elements of the dataset will be 
stored in a
 single-dimensional dataset.
 Recall that by default, single-dimensional datasets are stored as a table
-column in the output. But you can use @option{--onedasimage} to store them
-as a single-dimensional FITS array/image.
+column in the output. But you can use @option{--onedasimage} or
+@option{--onedonstdout} to respectively store them as a single-dimensional
+FITS array/image, or to print them on the standard output.
 @item erode
 @cindex Erosion
@@ -13720,7 +13721,8 @@ default, when the output is 1D, Arithmetic will write 
it as a table, not an
 image/array. The format of the output table (plain text or FITS ASCII or
 binary) can be set with the @option{--tableformat} option, see @ref{Input
 output options}). You can disable this feature (write 1D arrays as FITS
-images/arrays) with the @option{--onedasimage} option.
+images/arrays, or to the standard output) with the @option{--onedasimage}
+or @option{--onedonstdout} options.
 See @ref{Common options} for a review of the options in all Gnuastro
 programs. Arithmetic just redefines the @option{--hdu} and
@@ -13792,6 +13794,12 @@ When final dataset to write as output only has one 
dimension, write it as a
 FITS image/array. By default, if the output is 1D, it will be written as a
 table, see above.
+@item -s
+@itemx --onedonstdout
+When final dataset to write as output only has one dimension, print it on
+the standard output, not in a file. By default, if the output is 1D, it
+will be written as a table, see above.
 @item -D
 @itemx --dontdelete
 Don't delete the output file, or files given to the @code{tofile} or

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