From 6eca585fc1c6a9807585989ea727c2c36357d2aa Mon Sep 17 00:00:00 2001
From: Allan Bowe <allnbwe@gmail.com>
Date: Wed, 22 Sep 2021 17:19:49 +0100
Subject: [PATCH] feat: new mp_getcols macro

---
 base/mp_getcols.sas                     | 67 +++++++++++++++++++++++++
 tests/crossplatform/mp_getcols.test.sas | 33 ++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 base/mp_getcols.sas
 create mode 100644 tests/crossplatform/mp_getcols.test.sas

diff --git a/base/mp_getcols.sas b/base/mp_getcols.sas
new file mode 100644
index 0000000..8c5f315
--- /dev/null
+++ b/base/mp_getcols.sas
@@ -0,0 +1,67 @@
+/**
+  @file
+  @brief Creates a dataset with column metadata.
+  @details This macro takes the `proc contents` output and "tidies it up" in the
+  following ways:
+
+    @li Blank labels are filled in with column names
+    @li Formats are reconstructed with default values
+    @li Types such as DATE / TIME / DATETIME are inferred from the formats
+
+  Example usage:
+
+      %mp_getcols(sashelp.airline,outds=work.myds)
+
+  @param ds The dataset from which to obtain column metadata
+  @param outds= (work.cols) The output dataset to create. Sample data:
+  |NAME $|LENGTH 8|VARNUM 8|LABEL $|FORMAT $49|TYPE $1 |DDTYPE $|
+  |---|---|---|---|---|---|---|
+  |AIR|8|2|international airline travel (thousands)|8.|N|NUMERIC|
+  |DATE|8|1|DATE|MONYY.|N|DATE|
+  |REGION|3|3|REGION|$3.|C|CHARACTER|
+
+  <h4> Related Macros </h4>
+  @li mf_getvarlist.sas
+  @li mm_getcols.sas
+
+  @version 9.2
+  @author Allan Bowe
+  @copyright Macro People Ltd - this is a licensed product and
+    NOT FOR RESALE OR DISTRIBUTION.
+
+**/
+
+%macro mp_getcols(ds, outds=work.cols);
+
+proc contents noprint data=&ds
+  out=_data_ (keep=name type length label varnum format:);
+run;
+data &outds(keep=name type length varnum format label ddtype);
+  set &syslast(rename=(format=format2 type=type2));
+  name=upcase(name);
+  if type2=2 then do;
+    length format $49.;
+    if format2='' then format=cats('$',length,'.');
+    else if formatl=0 then format=cats(format2,'.');
+    else format=cats(format2,formatl,'.');
+    type='C';
+    ddtype='CHARACTER';
+  end;
+  else do;
+    if format2='' then format=cats(length,'.');
+    else if formatl=0 then format=cats(format2,'.');
+    else if formatd=0 then format=cats(format2,formatl,'.');
+    else format=cats(format2,formatl,'.',formatd);
+    type='N';
+    if format=:'DATETIME' then ddtype='DATETIME';
+    else if format=:'DATE' or format=:'DDMMYY' or format=:'MMDDYY'
+      or format=:'YYMMDD' or format=:'E8601DA' or format=:'B8601DA'
+      or format=:'MONYY'
+    then ddtype='DATE';
+    else if format=:'TIME' then ddtype='TIME';
+    else ddtype='NUMERIC';
+  end;
+  if label='' then label=name;
+run;
+
+%mend mp_getcols;
\ No newline at end of file
diff --git a/tests/crossplatform/mp_getcols.test.sas b/tests/crossplatform/mp_getcols.test.sas
new file mode 100644
index 0000000..eb0ef7d
--- /dev/null
+++ b/tests/crossplatform/mp_getcols.test.sas
@@ -0,0 +1,33 @@
+/**
+  @file
+  @brief Testing mp_getcols macro
+
+  <h4> SAS Macros </h4>
+  @li mp_getcols.sas
+  @li mp_assertcolvals.sas
+  @li mp_assertdsobs.sas
+
+**/
+
+
+/* valid filter */
+%mp_getcols(sashelp.airline,outds=work.info)
+
+
+%mp_assertdsobs(work.info,
+  desc=Has 3 records,
+  test=EQUALS 3,
+  outds=work.test_results
+)
+
+data work.check;
+  length val $10;
+  do val='NUMERIC','DATE','CHARACTER';
+    output;
+  end;
+run;
+%mp_assertcolvals(work.info.ddtype,
+  checkvals=work.check.val,
+  desc=All values have a match,
+  test=ALLVALS
+)
\ No newline at end of file