From 490821c03967d279a77bf836a86e0f6eb5d15511 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Fri, 29 May 2020 12:35:29 -0400
Subject: [PATCH 1/2] added chmod.sh

---
 share/adapters/chmod.sh | 56 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 share/adapters/chmod.sh

diff --git a/share/adapters/chmod.sh b/share/adapters/chmod.sh
new file mode 100644
index 0000000..13064d7
--- /dev/null
+++ b/share/adapters/chmod.sh
@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+
+# Contributed by Erez Binyamin (github.com/ErezBinyamin)
+
+# Translate between chmod string and number
+# Contrib to chubin - cheat.sh
+chmod_calc(){
+  p_s=""
+  p_n=""
+  R=()
+  W=()
+  X=()
+  # If permission number is given calc string
+  if [[ $1 =~ ^-?[0-9]+$ ]]
+  then
+    p_n=$1
+    for (( i=0; i<${#1}; i++ ))
+    do
+      num=$(echo "obase=2;${1:$i:1}" | bc | xargs printf '%03d')
+      [ ${num:0:1} -eq 1 ] && p_s+='r' || p_s+='-'
+      [ ${num:1:1} -eq 1 ] && p_s+='w' || p_s+='-'
+      [ ${num:2:1} -eq 1 ] && p_s+='x' || p_s+='-'
+      [ ${num:0:1} -eq 1 ] && R+=('X') || R+=(' ')
+      [ ${num:1:1} -eq 1 ] && W+=('X') || W+=(' ')
+      [ ${num:2:1} -eq 1 ] && X+=('X') || X+=(' ')
+    done
+  # If permission string is given calc number
+  else
+    p_s=$1
+    for (( i=0; i<${#1}; i+=0 ))
+    do
+      num=0
+      [[ ${1:$i:1} == 'r' ]] && R+=('X') || R+=(' ')
+      [[ ${1:$((i++)):1} == 'r' ]] && let num++
+      num=$(( num << 1 ))
+      [[ ${1:$i:1} == 'w' ]] && W+=('X') || W+=(' ')
+      [[ ${1:$((i++)):1} == 'w' ]] && let num++
+      num=$(( num << 1 ))
+      [[ ${1:$i:1} == 'x' ]] && X+=('X') || X+=(' ')
+      [[ ${1:$((i++)):1} == 'x' ]] && let num++
+      p_n+="$num"
+    done
+  fi
+  printf "
+Linux Permissions String:\t${p_s}
+Linux Permissions Number:\t${p_n}
+
+Owner\t\tGroup\t\tPublic
+
+Read    [${R[0]}]\tRead    [${R[1]}]\tRead    [${R[2]}]
+Write   [${W[0]}]\tWrite   [${W[1]}]\tWrite   [${W[2]}]
+Execute [${X[0]}]\tExecute [${X[1]}]\tExecute [${X[2]}]
+"
+}
+
+chmod_calc $@

From 6c14dc98dafd3b45628ca78f1fd6c654b5efb138 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Fri, 29 May 2020 12:39:16 -0400
Subject: [PATCH 2/2] Integrated chmod.sh

---
 lib/adapter/cmd.py | 25 +++++++++++++++++++++++++
 lib/config.py      |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/lib/adapter/cmd.py b/lib/adapter/cmd.py
index 66699ea..db365e2 100644
--- a/lib/adapter/cmd.py
+++ b/lib/adapter/cmd.py
@@ -140,3 +140,28 @@ class AdapterOeis(CommandAdapter):
 
     def is_found(self, topic):
         return True 
+
+class AdapterChmod(CommandAdapter):
+    """
+    Show chmod numeric values and strings
+    Exported as: "/chmod/NUMBER"
+    """
+
+    _adapter_name = "chmod"
+    _output_format = "text"
+    _cache_needed = True
+    _command = ["share/adapters/chmod.sh"]
+
+    def _get_command(self, topic, request_options=None):
+        cmd = self._command[:]
+        if not cmd[0].startswith("/"):
+            cmd[0] = _get_abspath(cmd[0])
+
+        # cut chmod/ off
+        if topic.startswith("chmod/"):
+            topic = topic[4:]
+
+        return cmd + [topic]
+
+    def is_found(self, topic):
+        return True 
diff --git a/lib/config.py b/lib/config.py
index 4b51460..25c9785 100644
--- a/lib/config.py
+++ b/lib/config.py
@@ -86,6 +86,7 @@ _CONFIG = {
         "learnxiny",
         "rfc",
         "oeis",
+        "chmod",
         ],
     "adapters.mandatory": [
         "search",
@@ -116,6 +117,7 @@ _CONFIG = {
         ("^[^/]*/rosetta(/|$)", "rosetta"),
         ("^rfc/", "rfc"),
         ("^oeis/", "oeis"),
+        ("^chmod/", "chmod"),
         ("^:", "internal"),
         ("/:list$", "internal"),
         ("/$", "cheat.sheets dir"),