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+leddy
+leddy.1
+leddy.5
diff --git a/COPYING b/COPYING
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--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..89ba290
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,32 @@
+VERSION=0.1.1
+PREFIX?=/usr/local
+BINDIR?=$(PREFIX)/bin
+MANDIR?=$(PREFIX)/share/man
+
+.DEFAULT_GOAL=all
+
+leddy:
+	hare build
+
+leddy.1: leddy.1.scd
+	scdoc < $< > $@
+
+leddy.5: leddy.5.scd
+	scdoc < $< > $@
+
+all: leddy leddy.1 leddy.5
+
+clean:
+	rm leddy leddy.1 leddy.5
+
+install: all
+	mkdir -p $(DESTDIR)$(BINDIR) $(DESTDIR)$(MANDIR)/man1
+	mkdir -p $(DESTDIR)$(BINDIR) $(DESTDIR)$(MANDIR)/man5
+	install -m755 leddy $(DESTDIR)$(BINDIR)/leddy
+	install -m644 leddy.1 $(DESTDIR)$(MANDIR)/man1/leddy.1
+	install -m644 leddy.5 $(DESTDIR)$(MANDIR)/man5/leddy.5
+
+uninstall:
+	rm -f $(DESTDIR)$(BINDIR)/leddy
+	rm -f $(DESTDIR)$(MANDIR)/man1/leddy.1
+	rm -f $(DESTDIR)$(MANDIR)/man5/leddy.5
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c2f4a9b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,56 @@
+# leddy
+
+minimal plain text accounting tool
+
+`leddy` is a [plain text accounting](https://plaintextaccounting.org/) tool,
+inspired by similar tools like [ledger](https://ledger-cli.org/),
+[hledger](https://hledger.org/) and [beancount](https://beancount.github.io/).
+It is implemented in [Hare](https://harelang.org) with an emphasis on parsing
+speed, specificity and correctness, and is geared toward the accounting needs
+of individuals. (That's somewhat by necessity because it is a young and modest
+project.)
+
+`leddy` uses a unique ledger format that differs slightly from other plain text
+accounting tools. Most notably, no row contents are inferred, so leaving an
+amount blank to auto-balance it with the prior row is not allowed. Other
+nuances, largely implemented at the author's preference, may exist; consulting
+the man pages is recommended, but overall it should not feel intimidating to
+those familiar with other plain text accounting tools.
+
+An example ledger file exists in the repo.
+
+# Installation
+
+Requires a working [Hare](https://harelang.org) toolchain. `scdoc` is optional,
+but required if you want the man pages.
+
+```
+make
+sudo make install
+```
+
+# Usage
+
+* Trial balance:
+  `leddy -f /path/to/ledgerfile tb`
+
+* Balance sheet (by default, equity and zero-balance accounts omitted):
+  `leddy -f /path/to/ledgerfile bs`
+
+* Balance sheet (traditional):
+  `leddy -f /path/to/ledgerfile -qz bs`
+
+* Income statement for 2024:
+  `leddy -f /path/to/ledgerfile -b 2024-01-01 -e 2024-12-31 is`
+
+* Balance sheet on 10-31-2023:
+  `leddy -f /path/to/ledgerfile -e 2023-10-31 bs`
+
+* Summary of currency conversion rates observed in Jan 2022:
+  `leddy -f /path/to/ledgerfile -b 2022-01-01 -e 2022-01-31 fx`
+
+# Contributing
+
+This is a modest project with modest goals, but patchsets are welcome. The goal
+of this project is not to create a feature-competitive replacement for any of
+the projects mentioned above. Emphasis is on simplicity and comprehensibility.
diff --git a/errs/errors.ha b/errs/errors.ha
new file mode 100644
index 0000000..fe6dd97
--- /dev/null
+++ b/errs/errors.ha
@@ -0,0 +1,58 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+// An error which indicates the desired account was not found.
+export type notfound = !void;
+
+// An error which indicates the desired operation is not possible.
+export type invalid = !void;
+
+// An error indicating inconsistent precision was used between multiple entries
+// with the same currency.
+export type precision = void;
+
+// An error which indicates the given entry is imbalanced.
+export type imbalanced = !void;
+
+// An error which indicates the given entry is conceptually valid, but cannot
+// be parsed due to an unsupported case.
+export type unsupported = !void;
+
+// An error which indicates a filesystem access problem.
+export type filesystem = !void;
+
+// Encapsulation of all the above.
+export type error = (
+	notfound |
+	invalid |
+	precision |
+	imbalanced |
+	unsupported |
+	filesystem
+);
+
+export fn strerror(e: error) str = {
+	match (e) {
+		case notfound => return "not found";
+		case invalid => return "invalid";
+		case precision => {
+			return "inconsistent precision with same currency";
+		};
+		case imbalanced => return "imbalanced entry";
+		case unsupported => return "unsupported entry";
+		case filesystem => return "filesystem access error";
+	};
+};
diff --git a/leddy.1.scd b/leddy.1.scd
new file mode 100644
index 0000000..045a491
--- /dev/null
+++ b/leddy.1.scd
@@ -0,0 +1,89 @@
+leddy(1)
+
+# NAME
+
+*leddy* - plain text accounting tool
+
+# DESCRIPTION
+
+*leddy* is a read-only plain text accounting tool. It parses text files
+containing financial transactions, as in a general ledger, and aggregates or
+searches through them in varying ways depending on the passed command. For
+safety, because it has the potential to parse sensitive and precise financial
+data, *leddy* never modifies any files.
+
+*leddy* expects a file format that differs somewhat from that of other plain
+text accounting tools. The file format is documented in *leddy*(5).
+
+# USAGE
+
+*leddy* expects a number of flags followed by a command. All flags must precede
+the command.
+
+The available flags are as follows:
+
+*-b* _date_
+	Ignore entries prior to the provided date. Date must be provided in
+	ISO 8601 (YYYY-MM-DD) format. Default is _null_.
+
+*-e* _date_
+	Ignore entries after the provided date. Date must be provided in
+	ISO 8601 (YYYY-MM-DD) format. Default is _null_.
+
+*-f* _/path/to/ledgerfile_
+	The ledger file to parse. This is always required. No default.
+
+*-q*
+	Include Equity accounts in balance sheet reports. Has no effect on
+	other reports.
+
+*-z*
+	Include zero balance accounts. By default, these are hidden, except on
+	trial balance reports.
+
+The available commands are as follows:
+
+*tb*
+	Print a trial balance report. This is a report showing the balances of
+	all accounts, and can be used for purposes including a general overview
+	of all activity in a given time, verifying that the ledger balances,
+	etc.
+
+*bs*
+	Print a balance sheet report. This is a report showing the balances of
+	each asset, liability and equity account at a given point in time. It
+	typically does not make conceptual sense to pass a *-b* parameter to a
+	balance sheet report, because all transactions prior to a given point
+	in time should be incorporated into a balance sheet.
+
+	For financial reporting, balance sheets contain equity accounts. For
+	most people, however, equity accounts are not terribly useful, so
+	*leddy* does not show them by default on balance sheets. You can pass a
+	flag (as indicated in the prior section) to show these if you wish.
+
+*is*
+	Print an income statement report. This is a report showing the activity
+	of each income and expense account between two given points in time.
+	*leddy* produces these in a standard way without deviation from typical
+	accounting principles.
+
+	Users unfamiliar with double-entry accounting should note that income
+	details are typically entered as credits, and expenses are typically
+	debits. Ordinary income looks negative on a balance sheet, and *leddy*
+	does not hide this from the user.
+
+*fx*
+	Print an exchange rates report. This is a report showing the exchange
+	rates that are implied to exist between currencies or commodities when
+	multiple currencies appear in the same entry. For example, if you write
+	an entry that debits 10 USD from an account and credits 15 CAD to
+	another, *leddy* assumes the entry is meant to balance and an exchange
+	rate of 1.5 CAD per USD is implied.
+
+	The report only prints the final implied exchange rate between each
+	pair on each date. If multiple exchange rates were implicitly created
+	for each day, only the one from the last such entry on that date is
+	shown on the report.
+
+	See *leddy*(5) for more details on using *leddy* with multiple
+	currencies.
diff --git a/leddy.5.scd b/leddy.5.scd
new file mode 100644
index 0000000..d7bed19
--- /dev/null
+++ b/leddy.5.scd
@@ -0,0 +1,140 @@
+leddy(5)
+
+# NAME
+
+*leddy* - file format and syntax reference
+
+# DESCRIPTION
+
+*leddy* uses a general ledger format similar to, but distinct from, other
+common plain text accounting tools. This document assumes a general knowledge
+of accounting principles, but no specific knowledge of other plain text
+accounting tools.
+
+*leddy* expects plain text files with a particular syntax in valid UTF-8. If
+any aspect of the file is unexpected, *leddy* will report this to the user with
+a line number and exit.
+
+Lines beginning with '#' are interpreted as comments and ignored. Blank lines
+and lines containing only whitespace are also ignored.
+
+# ENTRIES AND DETAILS
+
+An entry in a *leddy* ledger file is comprised of one _header_ line and two or
+more _detail_ lines. The header line contains the date in ISO-8601 (YYYY-MM-DD)
+format, followed by one space, followed by the name or description of the entry
+in question. For example, to write a _header_ representing a fast food purchase:
+
+	2023-01-02 Taco Bell
+
+*leddy* is unopinionated about the content of the line after the date and one
+space character that should follow it.
+
+A _detail_ line contains four elements, each separated by one or more spaces:
+
+1. leading whitespace, typically one tab character++
+2. a valid account string++
+3. the amount to debit or credit the account++
+4. the currency or commodity that the amount is denominated in
+
+Here is one possible complete fast food purchase entry, to finish our example:
+
+	2023-01-02 Taco Bell++
+		Expenses:Food:Restaurants  5.00 USD++
+		Liabilities:Cards:Chase   -5.00 USD
+
+There is no limit to the number of detail lines you can include in an entry. It
+is typically ideal to keep them as specific as possible, but complex events,
+especially those involving taxes, equities, and debts can validly involve many.
+Here is an example of how you may handle the monthly payment on a loan that
+accrues interest:
+
+	2023-10-28 Navient++
+		Assets:Checking:Chase     -402.00 USD++
+		Expenses:Fees:Interest      68.00 USD++
+		Liabilities:Loans:Student  334.00 USD
+
+Here, we represent a payment of 402.00 USD, of which 68.00 went toward interest
+and the remaining toward the principal balance. When summed up, all details on
+an entry must balance, i.e. they must sum to zero. *leddy* will always verify
+this and refuse to report anything if any entries in the ledger do not balance.
+
+Other plain text accounting tools typically allow you to optionally omit the
+amount and currency of exactly one detail line, and the parser will infer that
+the entry is intended to balance and insert the necessary debit or credit to
+make the entry balance. *leddy* does not allow this; all detail amounts and
+currencies must be explicit.
+
+There is one exception to the typical *leddy* balancing behavior related to
+multi-currency entries. See *MULTI-CURRENCY*.
+
+## ACCOUNTS
+
+Accounts are strings that represent the location, application, or context of a
+balance of money. They should contain at least two segments. The first segment
+is always one of _Assets_, _Liabilities_, _Equity_, _Income_ or _Expenses_.
+*leddy* enforces this. Subsequent segments can be organized however the user
+wishes. Users are encouraged to consult educational accounting resources as
+needed when considering how to best structure accounts.
+
+As shown in the examples throughout this document, segments are colon-delimited.
+Segments cannot contain spaces.
+
+## AMOUNTS AND CURRENCIES
+
+A currency must always follow every amount, and be separated from that amount
+by exactly one space.
+
+*leddy* handles amounts as integers internally, with precision determined by
+the number of integers past the decimal point, if any. This ensures that no
+floating point errors occur in processing.
+
+Each account-currency combination must have a consistent number of integers past
+the decimal point every time it appears. In other words, the below combination
+of entries is invalid even though, in concept, they both make sense:
+
+	2023-01-01 Entry One++
+		Expenses:Fees:Interest      50 USD++
+		Liabilities:Loans:Personal -50.00 USD
+
+	2023-01-02 Entry Two++
+		Expenses:Fees:Interest      50.00 USD++
+		Liabilities:Loans:Student  -50.00 USD
+
+In parsing this, *leddy* would complain that the precision between entries on
+the Expenses:Fees:Interest account differs from the first time it saw it. This
+check is designed to prevent common data entry mistakes, and simplifies the
+internal handling of balances.
+
+Currencies here are fiat currencies, but *leddy* is unopinionated about this.
+Holdings of stocks, precious metals, crypto assets, or anything else with value 
+can and should be represented as a currency in this model.
+
+# MULTI-CURRENCY
+
+*leddy* has no knowledge of the outside world and therefore no way of knowing
+the exchange rates between different declared currencies. Therefore, it trusts
+the user to input valid, balanced entries when multiple currencies are
+involved.
+
+When two currencies are used in one entry, *leddy* assumes the entry is balanced
+and calculates an implied exchange rate between the two currencies that makes
+the entry balance. These exchange rates can be observed in the *fx* report;
+see *leddy*(1).
+
+Lastly, *leddy* must make each currency balance. To achieve this, *leddy*
+inserts two new details into the entry that net each currency to zero, into a
+special _Equity:Conversions_ account. This account does not need to be declared
+and is automatically created when needed. This is the only time *leddy* will
+implicitly alter the representation of an entry. (Of course, it doesn't edit
+the ledger file.) The effect is that the _Equity:Conversions_ account will
+tabulate the net gain or loss of each currency from conversions into other
+currencies.
+
+Note the _Equity:Conversions_ account is not otherwise special, can be manually
+declared and interacted with, etc. just like any other account.
+
+Entries are allowed to contain up to two currencies in total. Three or more is
+not supported. This is because it would be impossible to implicitly calculate
+exchange rates if three or more currencies were in the same entry, because
+infinitely many valid solutions would exist.
diff --git a/ledger/detail.ha b/ledger/detail.ha
new file mode 100644
index 0000000..a546971
--- /dev/null
+++ b/ledger/detail.ha
@@ -0,0 +1,31 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+export type detail = struct {
+	account: str,
+	amount: i64,
+	precision: u64,
+	currency: str,
+};
+
+fn new_detail() detail = {
+	return detail {
+		account = "",
+		amount = 0,
+		precision = 0,
+		currency = "",
+	};
+};
diff --git a/ledger/entry.ha b/ledger/entry.ha
new file mode 100644
index 0000000..2f6e7a5
--- /dev/null
+++ b/ledger/entry.ha
@@ -0,0 +1,164 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+use fmt;
+use math;
+use strings;
+
+use errs;
+
+export type entry = struct {
+	date: i64,    // epoch timestamp of first second in day
+	datestr: str, // %F formatted date
+	name: str,
+	details: []detail,
+};
+
+export fn new_entry() entry = {
+	return entry {
+		date = 0,
+		datestr = "",
+		name = "",
+		details = [],
+	};
+};
+
+export fn finish_entry(e: *entry) void = {
+	free(e.datestr);
+	free(e.name);
+	
+	for (let i = 0z; i < len(e.details); i += 1) {
+		free(e.details[i].account);
+		free(e.details[i].currency);
+	};
+	free(e.details);
+};
+
+// Account to insert virtual currency conversion entries into
+const conversion_account: str = "Equity:Conversions";
+
+// Validates that an entry is coherent, and returns void if so, else error.
+// 
+// Entries are not checked for balance if they involve multiple currencies.
+// This is because we trust the user to handle implicit conversions, and all
+// fields must be explicit in the ledger.
+export fn validate(led: *ledger, e: *entry, r: *rates) (void | errs::error) = {
+	if (len(e.details) == 0) {
+		return errs::invalid;
+	};
+
+	const currency = e.details[0].currency;
+	
+	let processed_mult_cur = false;
+	let has_debit_entry = false;
+	let has_credit_entry = false;
+	let sum = 0i64;
+	let details_to_add = (new_detail(), new_detail());
+
+	for (let i = 0z; i < len(e.details); i += 1) {
+		// if multiple currencies are involved, we check for coherence
+		// only by ensuring the entry has at least one debit and at
+		// least one credit. We trust the user to input the proper
+		// values, and therefore the proper implicit exchange rate.
+		if (e.details[i].currency != currency) {
+			const implicits = match (get_implicit_exchange_rate(e)) {
+				case let r: (i64, i64, f64) => yield r;
+				case let e: errs::error => return e;
+			};
+			insert_rate(
+				r,
+				e.datestr,
+				e.details[i].currency,
+				currency,
+				implicits.2,
+			);
+
+			details_to_add = (detail {
+				account = conversion_account,
+				amount = implicits.0 * -1,
+				precision = e.details[0].precision,
+				currency = currency,
+			}, detail {
+				account = conversion_account,
+				amount = implicits.1 * -1,
+				precision = e.details[i].precision,
+				currency = e.details[i].currency,
+			});
+
+			sum -= implicits.0 + implicits.1;
+			processed_mult_cur = true;
+		};
+
+		if (e.details[i].amount > 0) {
+			has_debit_entry = true;
+		} else if (e.details[i].amount < 0) {
+			has_credit_entry = true;
+		};
+
+		sum += e.details[i].amount;
+	};
+
+	if (!has_debit_entry && !has_credit_entry) {
+		return errs::invalid;
+	};
+
+	if (sum != 0) {
+		return errs::imbalanced;
+	};
+
+	if (details_to_add.0.account != "") {
+		append(e.details, details_to_add.0);
+		append(e.details, details_to_add.1);
+	};
+};
+
+// Returns a formatted amount for use in displaying reports.
+export fn resolve_amtstr(amt: i64, prec: u64) str = {
+	const a = fmt::asprint(amt);
+	defer free(a);
+	
+	if (prec == 0) {
+		return a;
+	};
+
+	if (len(a) <= prec: size) {
+		const p = fmt::asprint(prec);
+		defer free(p);
+
+		const d = fmt::asprint("0.{:_0", p, "}");
+		defer free(d);
+		
+		return fmt::asprintf(d, a);
+	};
+
+	const r = strings::torunes(a);
+	const before = strings::fromrunes(r[0..len(r) - prec: size]);
+	const after = strings::fromrunes(r[len(r) - prec: size..]);
+	free(r);
+	
+	defer free(before);
+	defer free(after);
+	
+	return strings::concat(before, ".", after);
+};
+
+// Should only be used as an intermediate step for displaying,
+// things, not to perform calculations with the result.
+//
+// Floating point financial math bad!
+export fn resolve_amtf(amt: i64, prec: u64) f64 = {
+	return amt: f64 / math::powf64(10.0, prec: f64);
+};
diff --git a/ledger/exchange_rates.ha b/ledger/exchange_rates.ha
new file mode 100644
index 0000000..4448ae2
--- /dev/null
+++ b/ledger/exchange_rates.ha
@@ -0,0 +1,158 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+use hash::fnv;
+use math;
+use sort;
+use strings;
+
+use errs;
+
+export type rates = struct {
+	m: [8][]rate,
+};
+
+export type rate = struct {
+	hash: u32,
+	
+	t: str, // date formatted as %F
+	base: str,
+	quote: str,
+	price: f64, // quote per base
+};
+
+fn new_rates() rates = {
+	return rates{...};
+};
+
+fn insert_rate(r: *rates, d: str, bs: str, q: str, amt: f64) void = {
+	const s = strings::join(";", d, bs, q);
+	defer free(s);
+	
+	const hash = fnv::string32(s);
+
+	let b = &r.m[hash % len(r.m)];
+	for (let i = 0z; i < len(*b); i += 1) {
+		if (b[i].t == d && b[i].base == bs && b[i].quote == q) {
+			b[i].price = amt;
+
+			return;
+		};
+	};
+
+	append(b, rate {
+		hash = hash,
+		t = d,
+		base = bs,
+		quote = q,
+		price = amt,
+	});
+};
+
+// Returns a sorted slice of tuples containing the exchange rates. Tuple is
+// (datestr, base, quote, price).
+export fn get_rates(r: *rates) [](str, str, str, f64) = {
+	let output: [](str, str, str, f64) = [];
+	for (let i = 0z; i < len(r.m); i += 1) {
+		for (let j = 0z; j < len(r.m[i]); j += 1) {
+			append(
+				output,
+				(
+					r.m[i][j].t,
+					r.m[i][j].base,
+					r.m[i][j].quote,
+					r.m[i][j].price,
+				)
+			);
+		};
+	};
+
+	sort::sort(output, size((str, str, str, f64)), &sort_rate_tuples);
+	return output;
+};
+
+fn sort_rate_tuples(a: const *opaque, b: const *opaque) int = {
+	const aa = a: *(str, str, str, f64);
+	const bb = b: *(str, str, str, f64);
+	
+	let c = strings::compare((*aa).0, (*bb).0);
+	if (c != 0) {
+		return c;
+	};
+
+	c = strings::compare((*aa).1, (*bb).1);
+	if (c != 0) {
+		return c;
+	};
+
+	return strings::compare((*aa).2, (*bb).2);
+};
+
+// Given an entry with exactly two currencies used, returns a tuple of totals
+// for each of the two currencies observed (where the first is the first
+// currency appearing in the entry), then the implicit exchange rate between
+// them. Fails if:
+// 1. The entry is incoherent
+// 2. The entry's details contain a number of currencies other than two
+//
+// The totals are in the native precision of each currency.
+//
+// Aborts if the entry has no details.
+fn get_implicit_exchange_rate(e: *entry) ((i64, i64, f64) | errs::error) = {
+	const b_cur = e.details[0].currency;
+	let q_cur = "";
+
+	let b_sum = e.details[0].amount;
+	let q_sum = 0i64;
+
+	let b_sumf = resolve_amtf(e.details[0].amount, e.details[0].precision);
+	let q_sumf = 0f64;
+
+	for (let i = 1z; i < len(e.details); i += 1) {
+		if (len(q_cur) == 0 && e.details[i].currency != b_cur) {
+			q_cur = e.details[i].currency;
+		} else if (
+			len(q_cur) > 0 &&
+			e.details[i].currency != b_cur &&
+			e.details[i].currency != q_cur
+		) {
+			return errs::unsupported;
+		};
+
+		if (e.details[i].currency == b_cur) {
+			b_sum += e.details[i].amount;
+			b_sumf += resolve_amtf(
+				e.details[i].amount, e.details[i].precision
+			);
+		} else if (e.details[i].currency == q_cur) {
+			q_sum += e.details[i].amount;
+			q_sumf += resolve_amtf(
+				e.details[i].amount, e.details[i].precision
+			);
+		};
+	};
+
+	if (math::isnegative(b_sumf) == math::isnegative(q_sumf)) {
+		// base and quote must be netted against each other
+		return errs::invalid;
+	};
+
+	if (b_sum == 0 || q_sum == 0) {
+		return errs::invalid;
+	};
+
+	return (b_sum, q_sum, q_sumf / b_sumf * -1f64);
+};
diff --git a/ledger/ledger.ha b/ledger/ledger.ha
new file mode 100644
index 0000000..20e74a1
--- /dev/null
+++ b/ledger/ledger.ha
@@ -0,0 +1,149 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+use hash::fnv;
+use sort;
+use strings;
+
+use errs;
+
+export type ledger = struct {
+	m: [64][]account,
+	e: []entry,
+	r: rates,
+
+	// epoch timestamps
+	begin: i64,
+	end: i64,
+};
+
+export type account = struct {
+	hash: u32,
+	account: str,
+	currency: str,
+	bal: i64,
+	precision: u64,
+};
+
+export fn new(b: i64, e: i64) ledger = {
+	return ledger{
+		begin = b,
+		end = e,
+		...
+	};
+};
+
+export fn finish(led: *ledger) void = {
+	for (let i = 0z; i < len(led.m); i += 1) {
+		for (let j = 0z; j < len(led.m[i]); j += 1) {
+			free(led.m[i][j].account);
+			free(led.m[i][j].currency);
+		};
+		free(led.m[i]);
+	};
+
+	for (let i = 0z; i < len(led.e); i += 1) {
+		finish_entry(&led.e[i]);
+	};
+	free(led.e);
+
+	for (let i = 0z; i < len(led.r.m); i += 1) {
+		free(led.r.m[i]);
+	};
+};
+
+export fn add_entry(led: *ledger, e: *entry) (void | errs::error) = {
+	if (led.begin != 0 && e.date < led.begin) {
+		return;
+	};
+	if (led.end != 0 && e.date > led.end) {
+		return;
+	};
+
+	for (let i = 0z; i < len(e.details); i += 1) {
+		match (edit_bal(led, &e.details[i])) {
+			case void => continue;
+			case let e: errs::error => return e;
+		};
+	};
+	append(led.e, *e);
+};
+
+// Increments or decrements the appropriate balance in the given ledger. If the
+// account name does not exist, an error is returned.
+fn edit_bal(led: *ledger, d: *detail) (void | errs::error) = {
+	const key = strings::concat(d.account, d.currency);
+	defer free(key);
+
+	const hash = fnv::string32(key);
+
+	let b = &led.m[hash % len(led.m)];
+	for (let i = 0z; i < len(*b); i += 1) {
+		if (b[i].account == d.account && b[i].currency == d.currency) {
+			if (d.precision != b[i].precision) {
+				return errs::precision;
+			};
+
+			b[i].precision = d.precision;
+			b[i].bal += d.amount;
+
+			return void;
+		};
+	};
+
+	// if not found, add it
+	append(b, account{
+		hash = hash,
+		account = strings::dup(d.account),
+		currency = strings::dup(d.currency),
+		bal = d.amount,
+		precision = d.precision,
+	});
+};
+
+// Returns a sorted slice of tuples containing the full account names and
+// balances. Tuple is (name, currency, amount, precision).
+export fn bals(led: *ledger) [](str, str, i64, u64) = {
+	let output: [](str, str, i64, u64) = [];
+	for (let i = 0z; i < len(led.m); i += 1) {
+		for (let j = 0z; j < len(led.m[i]); j += 1) {
+			append(
+				output,
+				(
+					led.m[i][j].account,
+					led.m[i][j].currency,
+					led.m[i][j].bal,
+					led.m[i][j].precision,
+				)
+			);
+		};
+	};
+
+	sort::sort(output, size((str, str, i64, u64)), &sort_tuples);
+	return output;
+};
+
+fn sort_tuples(a: const *opaque, b: const *opaque) int = {
+	const aa = a: *(str, str, i64, u64);
+	const bb = b: *(str, str, i64, f64);
+	
+	const cmp = strings::compare((*aa).0, (*bb).0);
+	if (cmp != 0) {
+		return cmp;
+	};
+
+	return strings::compare((*aa).1, (*bb).1);
+};
diff --git a/ledger/parse.ha b/ledger/parse.ha
new file mode 100644
index 0000000..b2dd69b
--- /dev/null
+++ b/ledger/parse.ha
@@ -0,0 +1,109 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+use bufio;
+use encoding::utf8;
+use io;
+use strconv;
+use strings;
+use time::date;
+
+use errs;
+
+export fn next_line(f: io::handle) (str | void | errs::error) = {
+	let b: []u8 = [];
+	defer free(b);
+
+	match (bufio::read_line(f)) {
+		case let bytes: []u8 => b = bytes;
+		case io::EOF => return;
+		case let err: io::error => return errs::filesystem;
+	};
+
+	match (strings::fromutf8(b)) {
+		case let s: str => {
+			return strings::dup(strings::trim(s));
+		};
+		case let err: utf8::invalid => return errs::invalid;
+	};
+};
+
+export fn parse(in: str) (entry | detail | errs::invalid) = {
+	const s = strings::trim(in);
+	const parts = strings::cut(s, " ");
+
+	if (len(parts.1) == 0) {
+		return errs::invalid;
+	};
+
+	parts.1 = strings::trim(parts.1);
+
+	match (isodate_to_unix(parts.0)) {
+		case let d: i64 => {
+			return entry {
+				date = d,
+				datestr = strings::dup(parts.0),
+				name = strings::dup(parts.1),
+				details = [],
+			};
+		};
+		case => {
+			if (!is_valid_account(parts.0)) {
+				return errs::invalid;
+			};
+
+			const (amt_str, c) = strings::cut(parts.1, " ");
+			const (whole, cents) = strings::cut(amt_str, ".");
+
+			const a = strings::concat(whole, cents);
+			defer free(a);
+
+			const final: i64 = match (strconv::stoi64(a)) {
+				case let n: i64 => yield n;
+				case => return errs::invalid;
+			};
+			
+			c = strings::trim(c);
+			return detail {
+				account = strings::dup(parts.0),
+				amount = final,
+				currency = strings::dup(c),
+				precision = len(cents),
+			};
+		};
+	};
+};
+
+export fn isodate_to_unix(s: str) (i64 | errs::invalid) = {
+	match (date::from_str("%F", s)) {
+		case let d: date::date => {
+			let s = date::asformat("%s", &d)!;
+			defer free(s);
+			return strconv::stoi64(s)!;
+		};
+		case => return errs::invalid;
+	};
+};
+
+fn is_valid_account(s: str) bool = {
+	return (
+		strings::hasprefix(s, "Assets:") ||
+		strings::hasprefix(s, "Liabilities:") ||
+		strings::hasprefix(s, "Equity:") ||
+		strings::hasprefix(s, "Income:") ||
+		strings::hasprefix(s, "Expenses:")
+	);
+};
diff --git a/main.ha b/main.ha
new file mode 100644
index 0000000..5afcef1
--- /dev/null
+++ b/main.ha
@@ -0,0 +1,223 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+use bufio;
+use encoding::utf8;
+use fmt;
+use fs;
+use getopt;
+use io;
+use os;
+use strings;
+
+use errs;
+use ledger;
+use reports;
+
+const version: str = "0.1.1";
+
+// TODO: Implement find (locate entries by name) and inspect (specific acct
+//       history) reports.
+
+export fn main() void = {
+	const cmd = getopt::parse(os::args,
+		"plain text accounting tool",
+		('b', "date", "beginning date filter"),
+		('e', "date", "ending date filter"),
+		('f', "file", "ledger file path"),
+		('q', "include equity in bs"),
+		('v', "output version and exit"),
+		('z', "include zero bals"),
+		"command",
+	);
+	defer getopt::finish(&cmd);
+
+	let b = 0i64;
+	let e = 0i64;
+	let f = "";
+	let q = false;
+	let v = false;
+	let z = false;
+
+	for (let i = 0z; i < len(cmd.opts); i += 1) {
+		const opt = cmd.opts[i];
+		switch (opt.0) {
+			case 'b' => {
+				match (ledger::isodate_to_unix(opt.1)) {
+					case let n: i64 => {
+						b = n;
+					};
+					case => fmt::fatal("FAIL invalid -b");
+				};
+			};
+			case 'e' => {
+				match (ledger::isodate_to_unix(opt.1)) {
+					case let n: i64 => e = n;
+					case => fmt::fatal("FAIL invalid -e");
+				};
+			};
+			case 'f' => f = opt.1;
+			case 'q' => q = true;
+			case 'v' => v = true;
+			case 'z' => z = true;
+			case => abort();
+		};
+	};
+
+	if (v) {
+		fmt::println(version)!;
+		return;
+	};
+
+	if (len(f) == 0) {
+		fmt::fatal("FAIL no ledger file");
+	};
+
+	const file = match (os::open(f, fs::flag::RDONLY)) {
+		case let f: io::file => yield f;
+		case let err: fs::error => {
+			fmt::fatalf(
+				"FAIL bad read at {}: {}", f, fs::strerror(err)
+			);
+		};
+	};
+
+	let command = reports::report::BALANCE_SHEET;
+	if (len(cmd.args) >= 1) {
+		command = switch (cmd.args[0]) {
+			case "tb" => yield reports::report::TRIAL_BALANCE;
+			case "is" => yield reports::report::INCOME_STATEMENT;
+			case "bs" => yield reports::report::BALANCE_SHEET;
+			case "fx" => yield reports::report::EXCHANGE_RATES;
+			case => fmt::fatal("FAIL invalid command");
+		};
+	};
+
+	let led = ledger::new(b, e);
+	//defer ledger::finish(&led);
+	
+	let cur_entry = ledger::new_entry();
+	let cur_line = 0;
+	for (true) {
+		cur_line += 1;
+		const line = match (ledger::next_line(file)) {
+			case let l: str => yield l;
+			case void => break;
+			case let e: errs::error => {
+				fmt::fatalf(
+					"FAIL (line {}): {}",
+					cur_line,
+					errs::strerror(e),
+				);
+			};
+		};
+
+		if (
+			len(strings::trim(line)) == 0 ||
+			strings::hasprefix(line, '#')
+		) {
+			continue;
+		};
+
+		match (process_line(&led, line, &cur_entry, cur_line)) {
+			case void => free(line);
+			case let e: errs::error => {
+				fmt::fatalf(
+					"FAIL parse (line {} or preceding entry): {}",
+					cur_line,
+					errs::strerror(e)
+				);
+			};
+		};
+	};
+
+	io::close(file)!;
+
+	// finalize the last entry if it is not followed by anything
+	if (len(cur_entry.name) > 0) {
+		const res = finalize_entry(&led, &cur_entry);
+		if (res is errs::error) {
+			fmt::fatalf(
+				"FAIL parse (line {} or preceding entry): {}",
+				cur_line + 1,
+				errs::strerror(res: errs::error)
+			);
+		};
+	};
+
+	// display whatever report
+	switch (command) {
+		case reports::report::TRIAL_BALANCE =>
+			reports::print_tb(&led);
+		case reports::report::INCOME_STATEMENT => 
+			reports::print_is(&led, z);
+		case reports::report::BALANCE_SHEET =>
+			reports::print_bs(&led, z, q);
+		case reports::report::EXCHANGE_RATES =>
+			reports::print_exchange_rates(&led);
+	};
+};
+
+fn process_line(
+	led: *ledger::ledger, l: str, e: *ledger::entry, line_num: int,
+) (void | errs::error) = {
+	match (ledger::parse(l)) {
+		case let h: ledger::entry => {
+			if (len(e.name) == 0) {
+				*e = h;
+				return;
+			};
+
+			match (finalize_entry(led, e)) {
+				case void => *e = h;
+				case let e: errs::error => return e;
+			};
+		};
+		case let d: ledger::detail => {
+			if (len(e.name) == 0) {
+				fmt::fatalf(
+					"FAIL orphaned detail (line {})",
+					line_num
+				);
+			};
+			append(e.details, d);
+		};
+		case let e: errs::invalid => {
+			fmt::fatalf(
+				"FAIL (line {}): {}",
+				line_num,
+				errs::strerror(e),
+			);
+		};
+	};
+};
+
+fn finalize_entry(
+	led: *ledger::ledger, old: *ledger::entry
+) (void | errs::error) = {
+	const res = ledger::validate(led, old, &led.r);
+	
+	if (res is errs::error) {
+		return res;
+	};
+
+	match (ledger::add_entry(led, old)) {
+		case void => ledger::finish_entry(old);
+		case let err: errs::error => {
+			return err;
+		};
+	};
+};
diff --git a/reports/reports.ha b/reports/reports.ha
new file mode 100644
index 0000000..a382b82
--- /dev/null
+++ b/reports/reports.ha
@@ -0,0 +1,166 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+use fmt;
+use strings;
+
+use ledger;
+
+export type report = enum {
+	TRIAL_BALANCE,
+	BALANCE_SHEET,
+	INCOME_STATEMENT,
+	EXCHANGE_RATES,
+};
+
+// TODO: Resolve accounts by segment, so the display can be nested.
+
+export fn print_tb(led: *ledger::ledger) void = {
+	const b = ledger::bals(led);
+	defer free(b);
+	
+	let t = new_totals();
+	defer finish(&t);
+
+	print_header(" Trial Balance ");
+
+	for (let i = 0z; i < len(b); i += 1) {
+		edit_bal(&t, b[i].1, b[i].2, b[i].3);
+		print_balance(b[i].0, b[i].2, b[i].3, b[i].1);
+	};
+	
+	print_total_line();
+
+	let final = tabulate(&t);
+	defer free(final);
+	
+	for (let i = 0z; i < len(final); i += 1) {
+		print_total(final[i].0, final[i].1, final[i].2);
+	};
+};
+
+export fn print_is(led: *ledger::ledger, include_zero: bool) void = {
+	const b = ledger::bals(led);
+	defer free(b);
+	
+	let t = new_totals();
+
+	print_header(" Income Statement ");
+
+	for (let i = 0z; i < len(b); i += 1) {
+		if (!strings::hasprefix(b[i].0, "Income:") && 
+			!strings::hasprefix(b[i].0, "Expenses:")) {
+
+			continue;
+		};
+		edit_bal(&t, b[i].1, b[i].2, b[i].3);
+		if (include_zero || b[i].2 != 0) {
+			print_balance(b[i].0, b[i].2, b[i].3, b[i].1);
+		};
+	};
+	
+	print_total_line();
+
+	let final = tabulate(&t);
+	defer free(final);
+	
+	for (let i = 0z; i < len(final); i += 1) {
+		print_total(final[i].0, final[i].1, final[i].2);
+	};
+};
+
+export fn print_bs(
+	led: *ledger::ledger, include_zero: bool, include_equity: bool
+) void = {
+	const b = ledger::bals(led);
+	defer free(b);
+	
+	let t = new_totals();
+
+	print_header(" Balance Sheet ");
+
+	for (let i = 0z; i < len(b); i += 1) {
+		if (strings::hasprefix(b[i].0, "Equity:") && !include_equity) {
+			continue;
+		} else if (strings::hasprefix(b[i].0, "Income:") || 
+			strings::hasprefix(b[i].0, "Expenses:")) {
+
+			continue;
+		};
+		edit_bal(&t, b[i].1, b[i].2, b[i].3);
+		if (include_zero || b[i].2 != 0) {
+			print_balance(b[i].0, b[i].2, b[i].3, b[i].1);
+		};
+	};
+	
+	print_total_line();
+
+	let final = tabulate(&t);
+	defer free(final);
+	
+	for (let i = 0z; i < len(final); i += 1) {
+		print_total(final[i].0, final[i].1, final[i].2);
+	};
+};
+
+export fn print_exchange_rates(led: *ledger::ledger) void = {
+	const r = ledger::get_rates(&led.r);
+
+	print_header(" Exchange Rates ");
+	
+	for (let i = 0z; i < len(r); i += 1) {
+		print_exchange_rate(
+			r[i].0, r[i].1, r[i].2, r[i].3,
+		);
+	};
+};
+
+fn print_header(content: str) void = {
+	fmt::printfln("{:_-=78}", content)!;
+};
+
+fn print_total_line() void = {
+	fmt::printfln("{:59}{:_-19}", "", "-")!;
+};
+
+fn print_total(currency: str, amt: i64, precision: u64) void = {
+	print_balance("", amt, precision, currency);
+};
+
+fn print_balance(acct: str, amt: i64, precision: u64, currency: str) void = {
+	const b = format_money(amt, precision);
+	defer free(b);
+	
+	if (amt >= 0) {
+		fmt::printfln("{:58} {:14} {:4}", acct, b, currency)!;
+	} else {
+		fmt::printfln("{:58} ({:13} {:4})", acct, b, currency)!;
+	};
+};
+
+fn print_exchange_rate(date: str, from: str, to: str, amt: f64) void = {
+	fmt::printfln("{:22} {:12}/{:-12} {:.5f14} {}", date, to, from, amt, from)!;
+	fmt::printfln("{:22} {:12}/{:-12} {:.5f14} {}", "", from, to, 1f64 / amt, to)!;
+};
+
+fn format_money(amt: i64, prec: u64) str = {
+	let a = amt;
+	if (a < 0) {
+		a *= -1;
+	};
+
+	return ledger::resolve_amtstr(a, prec);
+};
diff --git a/reports/totals.ha b/reports/totals.ha
new file mode 100644
index 0000000..2b7eddb
--- /dev/null
+++ b/reports/totals.ha
@@ -0,0 +1,92 @@
+// Copyright (C) 2023-2024 Adam House
+// 
+// This file is part of leddy.
+// 
+// leddy is free software: you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+// 
+// leddy is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// leddy. If not, see <https://www.gnu.org/licenses/>.
+
+use hash::fnv;
+use sort;
+use strings;
+
+use errs;
+
+type totals = struct {
+	m: [4][]total,
+};
+
+type total = struct {
+	hash: u32,
+	currency: str,
+	bal: i64,
+	precision: u64,
+};
+
+fn new_totals() totals = {
+	return totals{...};
+};
+
+fn finish(t: *totals) void = {
+	for (let i = 0z; i < len(t.m); i += 1) {
+		free(t.m[i]);
+	};
+};
+
+fn edit_bal(t: *totals, cur: str, amt: i64, prec: u64) void = {
+	const hash = fnv::string32(cur);
+
+	let b = &t.m[hash % len(t.m)];
+	for (let i = 0z; i < len(*b); i += 1) {
+		if (b[i].currency == cur) {
+			b[i].bal += amt;
+
+			return;
+		};
+	};
+
+	append(b, total {
+		hash = hash,
+		currency = cur,
+		bal = amt,
+		precision = prec,
+	});
+
+	return;
+};
+
+// Returns a sorted slice of tuples containing the currency names and
+// balances. Tuple is (currency, amount, precision).
+fn tabulate(t: *totals) [](str, i64, u64) = {
+	let output: [](str, i64, u64) = [];
+	for (let i = 0z; i < len(t.m); i += 1) {
+		for (let j = 0z; j < len(t.m[i]); j += 1) {
+			append(
+				output,
+				(
+					t.m[i][j].currency,
+					t.m[i][j].bal,
+					t.m[i][j].precision,
+				)
+			);
+		};
+	};
+
+	sort::sort(output, size((str, i64, u64)), &sort_tuples);
+	return output;
+};
+
+fn sort_tuples(a: const *opaque, b: const *opaque) int = {
+	const aa = a: *(str, i64, u64);
+	const bb = b: *(str, i64, f64);
+	
+	return strings::compare((*aa).0, (*bb).0);
+};