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+Copyright (c) 2011 Edward Langley

+All rights reserved.

+

+Redistribution and use in source and binary forms, with or without

+modification, are permitted provided that the following conditions

+are met:

+

+Redistributions of source code must retain the above copyright notice,

+this list of conditions and the following disclaimer.

+

+Redistributions in binary form must reproduce the above copyright

+notice, this list of conditions and the following disclaimer in the

+documentation and/or other materials provided with the distribution.

+

+Neither the name of the project's author nor the names of its

+contributors may be used to endorse or promote products derived from

+this software without specific prior written permission.

+

+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED

+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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+A fairly straightforward calculator program.

+It reads a template file and then either injects values from the command line or prompts for appropriate

+values

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+- Check if stdin is a terminal: if not, don't prompt for values

+- Perhaps allow a YAML metadata block at the beginning of the file?

+  - It could, for example, specify the permitted variable inputs

+- Perhaps implement a custom expression evaluator, rather than just using eval()

+

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+from __future__ import division

+import argparse

+import collections

+import os

+

+def parse_line(line):

+    line = line.split(':')

+    if len(line) > 2:

+        expr = line.pop().strip()

+        var = line.pop().strip()

+        desc = ':'.join(line).strip()

+    else:

+        expr = ''

+        var = line.pop().strip()

+        desc = ':'.join(line).strip()

+    return expr,var,desc

+

+def eval_line(expr,variables):

+    return eval(expr, {}, variables)

+

+def run_template(t, values):

+    with open(t) as f:

+        variables = {}

+        for line in f:

+            line = line.strip()

+            if line == '':

+                print;continue

+            expr, var, desc = parse_line(line)

+            if expr == '':

+                if values != []:

+                    expr = values.pop(0)

+                else:

+                    expr = raw_input('%s? ' % desc)

+                res = variables[var] = eval_line(expr, variables)

+            else:

+                res = variables[var] = eval_line(expr, variables)

+            print '%s: %s = %s' % (desc, var, res)

+

+def get_template_info(t, verbose=False):

+    with open(t) as f:

+        tmpl = f.read()

+        variables = ' '.join(var for expr,var,desc in map(parse_line, tmpl.split('\n')) if expr == '' and var != '')

+        print 'Template Usage: %s %s' % (os.path.basename(t).rpartition('.')[0], variables)

+        if verbose:

+            print

+            print 'Template Source:'

+            print tmpl

+

+

+

+def main():

+    template_dir = os.environ.get('SYMBCALC_TEMPLATES', 'templates')

+    argparser = argparse.ArgumentParser()

+    argparser.add_argument('--template-dir', dest='td', default=template_dir)

+    argparser.add_argument('template', nargs='?')

+    argparser.add_argument('values', nargs='*')

+    argparser.add_argument('-i', action='store_true')

+    argparser.add_argument('-v', action='store_true')

+    args = argparser.parse_args()

+    template = None

+    if args.template:

+        template = '%s.tmpl' % os.path.join(args.td, args.template)

+

+    if args.i:

+        if template:

+            get_template_info(template, args.v)

+        else:

+            print 'You must supply a template to get info about'

+    elif args.template:

+        try:

+            run_template(template, args.values)

+        except (KeyboardInterrupt, EOFError): pass

+    else:

+        print 'Available Templates:'

+        print '---'

+        for x in os.listdir(args.td):

+            if not x.endswith('.tmpl'): continue

+            print x.rpartition('.')[0]

+

+

+if __name__ == '__main__':

+    main()

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+Amount of Alcholic Beverage #1 (mL): a 

+Concentration (%): b

+Alcohol in Beverage #1 (mL): t: a*b/100

+

+Concentration of Alcoholic Beverage #2 (%): c

+Equivalent Volume of Beverage #2 (mL): t/c*100