esvsearch: split esv search code into separate program

Requires rewiring the build system to accommodate for two executables.

Fixes: https://todo.sr.ht/~jeremy/esv/4

esvsearch.d

@@ -0,0 +1,110 @@
+/*
+ * esvsearch: search the Bible from your terminal
+ *
+ * The GPLv2 License (GPLv2)
+ * Copyright (c) 2023-2024 Jeremy Baxter
+ *
+ * esv 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.
+ *
+ * esv 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 esv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+module esvsearch;
+
+import std.file    : FileException;
+import std.getopt  : getopt, GetOptException;
+import std.path    : baseName, expandTilde;
+import std.process : environment;
+import std.stdio   : writeln, writefln;
+
+import esvapi;
+import initial;
+import util;
+
+import cf = config;
+
+@safe:
+
+string cFlag; /* config path */
+bool   VFlag; /* show version */
+
+int
+main(string[] args)
+{
+	string apiKey;
+	string configPath;
+	INIUnit ini;
+	ESVApi esv;
+
+	sharedInit(args);
+
+	cFlag = null;
+
+	/* Parse command-line options */
+	try {
+		import std.getopt : config;
+		getopt(args,
+			config.bundling,
+			config.caseSensitive,
+			"c", &cFlag,
+			"V", &VFlag,
+		);
+	} catch (GetOptException e) {
+		handleOptError(e.msg);
+	}
+
+	if (VFlag) {
+		writeln("esvsearch " ~ cf.esvVersion);
+		return 0;
+	}
+
+	if (args.length < 2) {
+		stderr.writefln("usage: %s [-l length] query",
+			baseName(args[0]));
+		return 1;
+	}
+
+	/* determine configuration file: options take first priority,
+	 * then environment variables, and then the default path */
+	configPath = environment.get(cf.configEnv, cf.configPath)
+		.expandTilde();
+	try {
+		if (cFlag)
+			configPath = cFlag.expandTilde();
+
+		readINIFile(ini, configPath);
+	} catch (FileException e) {
+		/* filesystem syscall errors */
+		import core.stdc.errno : ENOENT;
+
+		if (e.errno != ENOENT)
+			die(e.msg);
+
+		warn(configPath ~ ": no such file or directory");
+		warn("Invoke esv to create an initial configuration file.");
+	}
+
+	apiKey = ini["api"].key("key");
+	enforceDie(apiKey != null,
+		"API key not present in configuration file; cannot proceed");
+
+	esv = new ESVApi(apiKey);
+
+	try
+		writeln(esv.searchFormat(args[1]));
+	catch (ESVException)
+		die("no results");
+	catch (CurlException e)
+		die(e.msg);
+
+	return 0;
+}