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shell examples

59382ebdcc5ffdd68315e28bb5df48922f48ea4c · ovidiucs · Jan 31, 2019 15:13

+110 −2 · 3 files changed

• a/folder/to/somefile.txt +1 −0
• shellandfs.nim +108 −2
• testing.txt +1 −0

diff --git a/a/folder/to/somefile.txt b/a/folder/to/somefile.txt
new file mode 100644
index 0000000..c728c51
--- /dev/null
+++ b/a/folder/to/somefile.txt
@@ -0,0 +1 @@
+somestring
\ No newline at end of file
diff --git a/shellandfs.nim b/shellandfs.nim
index 357ac91..60e645c 100644
--- a/shellandfs.nim
+++ b/shellandfs.nim
@@ -1,8 +1,11 @@
 import terminal #isatty, styledEcho
 import strformat #fmt, 
+import strutils
 import times
+import random 
+import os
 
-if isatty(stdout): # ./stdout_to_file
+#[if isatty(stdout): # ./stdout_to_file
   echo "This is output to the terminal."
 else:              # ./stdout_to_file | cat
   const
@@ -12,4 +15,107 @@ else:              # ./stdout_to_file | cat
     logFile = open(logFileName, fmWrite)
   stdout = logFile
   echo fmt"This is output to the {logFileName} file."
-  echo fmt"- Run using nim {NimVersion} on {now()}."
\ No newline at end of file
+  echo fmt"- Run using nim {NimVersion} on {now()}."
+  ]#
+echo '-'.repeat(40)
+
+styledEcho fgRed,
+    "Environment Variables #\n",
+    "Use putEnv to set environment variable\n",
+    "Use getEnv to get environment variable\n"
+echo """
+let
+  envVar = "NIM_TEMP"
+  envVarVal = "foo"
+
+putEnv(envVar, envVarVal)
+echo getEnv(envVar)
+"""
+let
+  envVar = "NIM_TEMP"
+  envVarVal = "foo"
+
+putEnv(envVar, envVarVal)
+echo getEnv(envVar)
+
+proc findNimStdLib*(): string =
+  try:
+    let nimexe = os.findExe("nim")
+    if nimexe.len == 0: return ""
+    result = nimexe.splitPath()[0]/../ "lib"
+    if not fileExists(result / "system.nim"):
+      when defined(unix):
+        result = nimexe.expandSymlink.splitPath()[0] /../"lib"
+        if not fileExists(result /"system.nim"): return ""
+  except OSError, ValueError:
+        return ""
+
+echo findNimStdLib()
+
+echo '-'.repeat(40)
+
+styledEcho fgRed,
+    "File base name"
+
+let
+  filePath = "/a/path/to/test.org"
+var
+  (dir, basename, ext) = splitFile(filePath)
+echo "dir = ", dir
+echo "basename = ", basename
+echo "ext = ", ext
+
+
+echo '-'.repeat(40)
+
+styledEcho fgRed,
+    "File handling"
+
+let
+  fileName = "testing.txt"
+#   fileName = "/tmp/foo/bar/zoo.txt" directory has to exists else ioerror
+  dataStr  = "abc"
+writeFile(fileName, dataStr)
+
+let
+  anotherFile = "a/folder/to/somefile.txt"
+  someData = "somestring" 
+  (dirv, _, _) = splitFile(anotherFile)
+removeDir("a/folder/to/")
+echo fmt"{dirv} exists ? {dirExists(dirv)}"
+if (not dirExists(dirv)):
+  echo fmt"  creating {dirv} .."
+  createDir(dirv)
+echo fmt"{dirv} exists now ? {dirExists(dirv)}"
+writeFile(anotherFile, someData)
+
+echo '-'.repeat(40)
+
+styledEcho fgRed,
+    "File handling -  get read file permissions"
+
+let
+  filePerm = getFilePermissions(anotherFile)
+echo filePerm
+
+proc parseFilePermissions(octals: string): set[FilePermission] = 
+  ## Converts the input permissions octal string to a Nim set
+  ## for FilePermission type
+  var perm: set[FilePermission]
+  let
+    readPerms  = @[fpUserRead, fpGroupRead, fpOthersRead] 
+    writePerms = @[fpUserWrite, fpGroupWrite, fpOthersWrite]
+    execPerms  = @[fpUserExec, fpGroupExec, fpOthersExec]
+  for idx, o in octals:
+    if o != '0':
+      if o in {'4', '5', '6', '7'}:
+        perm = perm + {readPerms[idx]}
+      if o in {'2', '3', '6', '7'}:
+        perm = perm + {writePerms[idx]}
+      if o in {'1', '3', '5', '7'}:
+        perm = perm + {execPerms[idx]}
+  result = perm
+  
+for _ in 0 .. 10:
+  let perm = fmt"{rand(7)}{rand(7)}{rand(7)}"
+  echo perm, " = ", parseFilePermissions(perm)
\ No newline at end of file
diff --git a/testing.txt b/testing.txt
new file mode 100644
index 0000000..f2ba8f8
--- /dev/null
+++ b/testing.txt
@@ -0,0 +1 @@
+abc
\ No newline at end of file