First attempt at sorting.

We can only sort by date and amount right now. I don't know if there are
other important ways of sorting. D:

1 files changed, 118 insertions, 0 deletions

diff --git a/utils/sort.py b/utils/sort.py
new file mode 100644
index 0000000..2e7f15a
--- /dev/null
+++ b/utils/sort.py
@@ -0,0 +1,118 @@
+from utils.read_file import entry
+from typing import List
+from utils.register import complete_prices
+
+
+def separate_currencies(my_entries: List[entry]):
+    """
+    Given a list of entries with just one transaction, group entries with
+    respect to their currencies symbols.
+    """
+    seen_curr = set()
+    list_curr = []
+
+    # First search for every currency we can find in `my_entries`.
+    for ent in my_entries:
+        for trans in ent.transactions:
+            wallet = trans[1]
+
+            if len(wallet.money.keys()) != 1:
+                raise Exception('Cannot compare more than one currency at a time.')
+
+            for curr in wallet.money.keys():
+                break
+
+            if curr not in seen_curr:
+                seen_curr.add(curr)
+                list_curr.append(curr)
+
+    # Now group each currency. Select a currency and append entries that have
+    # that specific currency. Then select the next seen currency and so on.
+    result = []
+    for my_currency in list_curr:
+        for ent in my_entries:
+            wallet = ent.transactions[0][1]
+
+            for curr in wallet.money.keys():
+                break
+
+            if my_currency == curr:
+                result.append(ent)
+
+    return result
+
+
+def join_concurrent_entries(my_entries: List[entry]):
+    result = []
+    for ent in my_entries:
+        if len(result) == 0:
+            result.append(ent)
+
+        elif ent.comment == result[-1].comment and ent.date == result[-1].date:
+            result[-1].transactions.append(
+                ent.transactions[0]
+            )
+
+        else:
+            result.append(ent)
+
+    return result
+
+
+def sort_by_date(my_entries: List[entry]):
+    my_entries.sort(key=lambda x: x.date)
+
+
+def sort_by_amount(my_entries: List[entry]):
+    """
+    We have to break entries by their transactions. Then we can sort the
+    entries by their amount in their unique transaction.
+    """
+
+    # Break entries for them to have only one transaction.
+    result = []
+    for ent in my_entries:
+        complete_prices(ent)
+
+        for trans in ent.transactions:
+            result.append(
+                entry(
+                    date=ent.date.strftime('%Y/%m/%d'),
+                    comment=ent.comment,
+                    transactions=[trans]
+                )
+            )
+    # Sort each transaction given the amount value.
+    result.sort(key=lambda x: x.transactions[0][1])
+    # Separate different currencies from each other.
+    result = separate_currencies(result)
+    # Join concurrent entries if they have the same comment and date.
+    result = join_concurrent_entries(result)
+
+    # Hacky way of modifying the original `my_entries` list.
+    while my_entries:
+        my_entries.pop()
+    for item in result:
+        my_entries.append(item)
+
+    # Each transaction now has the `currencies` class format. Convert all of
+    # them into strings.
+    for ent in my_entries:
+        for trans in ent.transactions:
+            for price in trans[1]:
+                break
+
+            trans[1] = price
+
+
+def sort_entries(my_entries: List[entry], rule: str) -> None:
+    """
+    Sort the list of entries in-place. This function returns None, the list
+    given as a parameter will be modified.
+    """
+    # Sort by date.
+    if rule.lower() in ['d', 'date']:
+        sort_by_date(my_entries)
+    # Sort by amount.
+    if rule.lower() in ['a', 'amount']:
+        sort_by_amount(my_entries)
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