From 2b69f81111a9477c506697beef18c695d95517af Mon Sep 17 00:00:00 2001
From: XeonSquared <redtailedairways@gmail.com>
Date: Tue, 8 Jan 2019 18:09:04 +1100
Subject: [PATCH] added shell utility programs

---
 exec/cat.lua |  6 +++++
 exec/ed.lua  | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 exec/ls.lua  | 10 +++++++
 3 files changed, 92 insertions(+)
 create mode 100644 exec/cat.lua
 create mode 100644 exec/ed.lua
 create mode 100644 exec/ls.lua

diff --git a/exec/cat.lua b/exec/cat.lua
new file mode 100644
index 0000000..3107761
--- /dev/null
+++ b/exec/cat.lua
@@ -0,0 +1,6 @@
+local tA = {...}
+for _,fn in ipairs(tA) do
+ local f = io.open(fn,"rb")
+ io.write(f:read("*a"))
+ f:close()
+end
diff --git a/exec/ed.lua b/exec/ed.lua
new file mode 100644
index 0000000..7ca3937
--- /dev/null
+++ b/exec/ed.lua
@@ -0,0 +1,76 @@
+local tA = {...}
+local fn = tA[1]
+local b,C,p = {},{},1
+local function sC()
+ if p > #b then
+  p = #b
+ end
+ if p < 1 then
+  p = 1
+ end
+end
+function C.i()
+ p=p-1
+ sC()
+ while true do
+  io.write(tostring(p).."] ")
+  l = io.read()
+  if l == "." then break end
+  table.insert(b,p,l)
+  p=p+1
+ end
+end
+function C.l(s,e)
+ for i = s or 1, e or #b do
+  print(string.format("%4d\t %s",i,b[i]))
+ end
+end
+function C.a()
+ p=p+1
+ C.i()
+end
+function C.p(n)
+ p=tonumber(n) or p
+ sC()
+end
+function C.d(n)
+ n=tonumber(n) or 1
+ for i = 1, n do
+  print(table.remove(b,p,i))
+ end
+end
+function C.r(f)
+ local f = fs.open(f)
+ if f then
+  for l in f:read("*a"):gmatch("[^\n]+") do
+   table.insert(b,p,l)
+   p=p+1
+  end
+  f:close()
+ end
+end
+function C.w(f)
+ local f=fs.open(f,"wb")
+ if f then
+  for _,l in ipairs(b) do
+   f:write(l.."\n")
+  end
+  f:close()
+ end
+end
+if fn then
+ C.r(fn)
+end
+while true do
+ io.write("ed> ")
+ local l,c = io.read(),{}
+ for w in l:gmatch("%S+") do
+  c[#c+1] = w
+ end
+ local e=table.remove(c,1)
+ if e == "q" then
+  break
+ elseif C[e] then
+  C[e](table.unpack(c))
+ end
+end
diff --git a/exec/ls.lua b/exec/ls.lua
new file mode 100644
index 0000000..db111f6
--- /dev/null
+++ b/exec/ls.lua
@@ -0,0 +1,10 @@
+local tA = {...}
+tA[1] = tA[1] or "."
+for _,d in ipairs(tA) do
+ if #tA > 1 then
+  print(d..":")
+ end
+ for _,f in ipairs(fs.list(d)) do
+  print(" "..f)
+ end
+end