a

1 files changed, 29 insertions, 0 deletions

diff --git a/examples/cli2.zc b/examples/cli2.zc
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index 0000000..0c3de12
--- /dev/null
+++ b/examples/cli2.zc
@@ -0,0 +1,29 @@
+// the command line, the environment, and capturing what a program writes.
+// run it as:  ./bin/zy examples/cli2.zc one two   (the first is this file's path
+// when zy is given one, otherwise <eval>, exactly as argv[0] is in c)
+include "src/lib/std.zc";
+
+fn main() {
+	put_s("argv: ");
+	for (int i = 0; i < argc; i++) { put_s(argv[i]); if (i + 1 < argc) put_s(" "); }
+	put_c(10);
+
+	// envp holds NAME=value strings, so a program can walk all of them
+	let n = 0;
+	for (int i = 0; i < envc; i++) if (Text.starts(envp[i], "HOME=")) n = n + 1;
+	put_s("HOME is set: "); put_n(n > 0); put_c(10);
+
+	// the same name the old way, one lookup instead of a walk
+	let v[80];
+	put_n(Host.env("HOME", v, 80) > 0); put_c(10);
+
+	// capture what the program writes, instead of printing it. every put_c,
+	// put_s and put_n from here on lands in the buffer.
+	let buf = capture.start();
+	put_s("this goes into the buffer, not the terminal");
+	put_c(10);
+	buf.end();		// stops the capture and terminates the string
+	put_s("captured "); put_n(len_w(buf)); put_s(" characters: ");
+	put_s(buf);
+	return 0;
+}
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