smem: allow column auto-sizing

smem

@@ -471,6 +471,37 @@ def showfields(fields, f):
     for l in sorted(fields.keys()):
         print "%-8s %s" % (l, fields[l][-1])
 
+def autosize(columns, fields, rows):
+    colsizes = {}
+    for c in columns:
+        sizes = [1]
+
+        if not options.no_header:
+            sizes.append(len(fields[c][0]))
+
+        if (options.abbreviate or options.percent) and 'a' in fields[c][2]:
+            sizes.append(7)
+        else:
+            for r in rows:
+                sizes.append(len(str(fields[c][1](r))))
+
+        colsizes[c] = max(sizes)
+
+    overflowcols = set(["command", "map"]) & set(columns)
+    if len(overflowcols) > 0:
+        overflowcol = overflowcols.pop()
+        totnoflow = sum(colsizes.values()) - colsizes[overflowcol]
+        try:
+            ttyrows, ttycolumns = os.popen('stty size', 'r').read().split()
+            ttyrows, ttycolumns = int(ttyrows), int(ttycolumns)
+        except:
+            ttyrows, ttycolumns = (24, 80)
+        maxflowcol = ttycolumns - totnoflow - len(columns)
+        maxflowcol = max(maxflowcol, 10)
+        colsizes[overflowcol] = min(colsizes[overflowcol], maxflowcol)
+
+    return colsizes
+
 def showtable(rows, fields, columns, sort):
     header = ""
     format = ""
@@ -493,6 +524,11 @@ def showtable(rows, fields, columns, sort):
         showfields(fields, missing)
         sys.exit(-1)
 
+    if options.autosize:
+        colsizes = autosize(columns, fields, rows)
+    else:
+        colsizes = {}
+
     for n in columns:
         f = fields[n][2]
         if 'a' in f:
@@ -503,6 +539,8 @@ def showtable(rows, fields, columns, sort):
             f = f.replace('a', 's')
         else:
             formatter.append(lambda x: x)
+        if n in colsizes:
+            f = re.sub(r"[0-9]+", str(colsizes[n]), f)
         format += f + " "
         header += f % fields[n][0] + " "
 
@@ -626,6 +664,8 @@ parser.add_option("-c", "--columns", type="str",
                   help="columns to show")
 parser.add_option("-t", "--totals", action="store_true",
                   help="show totals")
+parser.add_option("-a", "--autosize", action="store_true",
+                  help="size columns to fit terminal size")
 
 parser.add_option("-R", "--realmem", type="str",
                   help="amount of physical RAM")

smem.8

@@ -95,6 +95,10 @@ User filter regular expression.
 
 .SS OUTPUT FORMATTING
 
+.TP
+.B \-a, \-\-autosize
+Size columns to fit terminal size.
+
 .TP
 .BI "\-c " COLUMNS ", \-\-columns=" COLUMNS
 Columns to show.