Changes between Initial Version and Version 1 of Shell

Timestamp:

10/19/06 14:27:17 (18 years ago)

Author:

atzm

Comment:

--

Shell

@@ +1 @@
+[[PageOutline]]
+
+= Shell =
+シェルプログラミングはどこかに落とし穴がありそうで怖い．
+
+== 依存性を持つ関数呼び出し ==
+ * {{{dep.sh}}}
+{{{
+#!sh
+#!/bin/sh
+
+function die ()
+{
+  local stat=$1
+  local msg=$2
+
+  echo "${msg}: ${stat}" 1>&2
+  exit ${stat}
+}
+
+function _depnum ()
+{
+  local tgt=$1
+
+  for ((i=${#CHAIN[@]}; i >= 0; i--)); do
+    if [ "x${tgt}" = "x${CHAIN[$i]}" ]; then
+      echo $i
+      exit 0
+    fi
+  done
+
+  die 15 "ERR: no such target: ${tgt}"
+}
+
+function run ()
+{
+  if [ -z "$CHAIN" ]; then
+    die 33 "\`\$CHAIN' not declared"
+  fi
+
+  local tgt=$1
+  local arg=$2
+  local dnum=`_depnum ${tgt}`
+
+  for ((i=0; i <= ${dnum}; i++)); do
+    arg="`${CHAIN[$i]} ${arg}`"
+  done
+
+  if [ -n "${arg}" ]; then
+    echo ${arg}
+  fi
+}
+}}}
+
+ * {{{dop.sh}}}
+{{{
+#!sh
+#!/bin/sh
+
+source dep.sh
+
+function clean ()
+{
+  echo "arg_clean:  $1" 1>&2
+  echo "cleaned"
+}
+
+function pack ()
+{
+  echo "arg_pack:   $1" 1>&2
+  echo "packed"
+}
+
+function upload () 
+{
+  echo "arg_upload: $1" 1>&2
+  echo "uploaded"
+}
+
+CHAIN=(clean pack upload)
+
+if [ $# -eq 1 ]; then
+  res=`run $1 init`
+  echo
+  echo "result: ${res}"
+else
+  die 24 "syntax error"
+fi
+}}}
+
+ * 実行結果
+{{{
+#!sh
+$ sh dop.sh upload
+arg_clean:  init
+arg_pack:   cleaned
+arg_upload: packed
+
+result: uploaded
+
+$ sh dop.sh pack
+arg_clean:  init
+arg_pack:   cleaned
+
+result: packed
+
+$ sh dop.sh clean
+arg_clean:  init
+
+result: cleaned
+}}}