Improve git config script

Use function for logging
Use function for check if binary exists

scripts/git-config.sh

@@ -12,10 +12,17 @@ else
   DRY=false
 fi
 
+function run() {
+  echo "$*"
+  if [[ $DRY != "true" ]]; then
+    "$@"
+  fi
+}
+
 function git_alias() {
   local name="$1"
-  local body="$2"
-  git_set "alias.$name" "$body"
+  local value="$2"
+  git_set "alias.$name" "$value"
 }
 
 function git_unalias() {
@@ -26,25 +33,17 @@ function git_unalias() {
 function git_set() {
   local name="$1"
   local value="$2"
-  echo "git config --global $name $value"
-  if [[ $DRY != "true" ]]; then
-    git config --global "$name" "$value"
-  fi
+  run git config --global "$name" "$value"
 }
 
 function git_unset() {
   local name="$1"
-  echo "git config --global --unset $name"
-  if [[ $DRY != "true" ]]; then
-    git config --global --unset "$name"
-  fi
+  run git config --global --unset "$name"
 }
 
-function git_unset_if_not_set() {
-  local name="$1"
-  if ! git config "$name"; then
-    git_unset "$name"
-  fi
+function can_run() {
+  local application="$1"
+  command -v "$application" > /dev/null
 }
 
 git config --global core.editor vim
@@ -104,7 +103,7 @@ git_alias shd "stash drop"
 git_alias aliases "config --get-regexp alias"
 git_alias configs "config --list"
 
-if command -v diff-so-fancy > /dev/null; then
+if can_run diff-so-fancy; then
   git_set core.pager "diff-so-fancy | less --tabs=4 -RFX"
   git_set interactive.diffFilter "diff-so-fancy --patch"
 
@@ -122,7 +121,6 @@ if command -v diff-so-fancy > /dev/null; then
   git_set color.diff.old        "red bold"
   git_set color.diff.new        "green bold"
   git_set color.diff.whitespace "red reverse"
-
 else
   git_unset core.pager
   git_unset interactive.diffFilter