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sha256sum/halyde/apps/helpdb/sha256sum

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+COMMAND sha256sum
+USAGE [FILES]...
+DESCRIPTION Computes and prints the SHA-256 hash of each file.
+ARG1 FILES
+ARG1DESCRIPTION Specifies the paths to the files to hash.
+EXAMPLE1 sha256sum /halyde/apps/fetch.lua
+EXAMPLE2 sha256sum a.txt b.txt
+EXAMPLE1DESCRIPTION Computes and prints the SHA-256 hash of fetch.lua in the /halyde/apps directory.
+EXAMPLE2DESCRIPTION Computes and prints the SHA-256 hashes of a.txt and b.txt in the current working directory.

sha256sum/halyde/apps/sha256sum.lua

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+--[[
+  [[ User program to compute SHA-256 hashes of files for Halude
+  [[ Copyright (C) 2026  tema5002
+  [[
+  [[ 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 2
+  [[ 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 <http://www.gnu.org/licenses/>.
+  ]]--
+
+local fs = require("filesystem")
+local shell = require("shell")
+
+local args = {...}
+
+if not files[1] then
+    return shell.run("help sha256sum")
+end
+
+local sha256 = require("sha256")
+
+for _, file in ipairs(args) do
+    file = shell.resolvePath(file)
+
+    local handle = fs.open(file, "r")
+    if not handle then
+        print("\27[91msha256sum: can't open " .. file .. ".\27[0m")
+        goto continue
+    end
+
+    local ctx = sha256.init()
+    while true do
+        local chunk = handle:read(256)
+        if not chunk then break end
+        sha256.update(ctx, chunk)
+    end
+    handle:close()
+    local hash_bytes = sha256.final(ctx)
+    termlib.write(sha256.to_hex(hash_bytes) .. "  " ..file.. "\n")
+    ::continue::
+end