ref: c3101e4da486b2bf2e8b911bcb62dd8ec31c41bf
parent: 05d9123a707dec0eaa0ab079b94e69cdb750c6db
author: henesy <devnull@localhost>
date: Tue Jul 9 22:05:34 EDT 2019
add seq(1) ;; no man yet
--- a/appl/cmd/mkfile
+++ b/appl/cmd/mkfile
@@ -130,6 +130,7 @@
runas.dis\
sed.dis\
sendmail.dis\
+ seq.dis\
sha1sum.dis\
sleep.dis\
sort.dis\
--- /dev/null
+++ b/appl/cmd/seq.b
@@ -1,0 +1,92 @@
+implement Seq;
+
+include "sys.m";
+ sys: Sys;
+
+include "draw.m";
+
+include "arg.m";
+
+include "bufio.m";
+ bio: Bufio;
+ Iobuf: import bio;
+
+Seq: module {
+ init: fn(nil: ref Draw->Context, args: list of string);
+};
+
+out: ref Iobuf;
+
+# Print a sequence of numbers in steps of a given increment
+init(nil: ref Draw->Context, args: list of string) {
+ sys = load Sys Sys->PATH;
+ arg := load Arg Arg->PATH;
+ if(arg == nil)
+ raise "Arg is nil";
+ bio = load Bufio Bufio->PATH;
+ if(bio == nil)
+ raise "Bio is nil";
+
+ arg->init(args);
+ out = bio->open("/fd/1", bio->OWRITE);
+
+ # TODO: [-w] [-f format]
+ # Note: Limbo doesn't seem to like non-constant format specifiers
+ arg->setusage("seq [first [increment]] last");
+ args = arg->argv();
+ argc := len(args);
+
+ step := 1.0;
+ first := 1.0;
+ last: real;
+ printer: ref fn(i: real) = iprint;
+
+ case argc {
+ 1 =>
+ # Seq [1,last]
+ last = real hd args;
+ 2 =>
+ # Seq [first,last]
+ first = real hd args;
+ last = real hd tl args;
+ 3 =>
+ # Seq [first,last] by step increment
+ first = real hd args;
+ step = real hd tl args;
+ last = real hd tl tl args;
+ * => arg->usage();
+ }
+
+ if(isfloat(first) || isfloat(step) || isfloat(last))
+ printer = rprint;
+
+ # Iterate
+ for(i := first; i <= last; i += step)
+ printer(i);
+
+ out.flush();
+ out.close();
+ exit;
+}
+
+# Print int
+iprint(i: real) {
+ out.puts(sys->sprint("%d\n", int i));
+}
+
+# Print real
+rprint(i: real) {
+ out.puts(sys->sprint("%g\n", i));
+}
+
+# Determine if functionally float by truncating and comparing the difference
+# 2.5 - 2.0 = 0.5 != 0.0 ;; 3.0 - 3.0 = 0.0 == 0.0
+isfloat(r: real): int {
+ i := int r;
+ ir := real i;
+
+ if(r - ir == 0.0)
+ return 0;
+
+ return 1;
+}