Fix #2859; script error when cwd name contains %

vendor/clink.lua

@@ -51,11 +51,37 @@ local function get_unknown_color()
 end
 
 ---
--- Makes a string safe to use as the replacement in string.gsub
+-- Escapes special characters in a string.gsub `find` parameter, so that it
+-- can be matched as a literal plain text string, i.e. disable Lua pattern
+-- matching.  See "Patterns" (https://www.lua.org/manual/5.2/manual.html#6.4.1).
+-- @param {string} text Text to escape
+-- @returns {string} Escaped text
 ---
-local function verbatim(s)
-    s = string.gsub(s, "%%", "%%%%")
-    return s
+local function escape_gsub_find_arg(text)
+    return text and text:gsub("([-+*?.%%()%[%]$^])", "%%%1") or ""
+end
+
+---
+-- Escapes special characters in a string.gsub `replace` parameter, so that it
+-- can be replaced as a literal plain text string, i.e. disable Lua pattern
+-- matching.  See "Patterns" (https://www.lua.org/manual/5.2/manual.html#6.4.1).
+-- @param {string} text Text to escape
+-- @returns {string} Escaped text
+---
+local function escape_gsub_replace_arg(text)
+    return text and text:gsub("%%", "%%%%") or ""
+end
+
+---
+-- Perform string.sub, but disable Lua pattern matching and just treat both
+-- the `find` and `replace` parameters as a literal plain text replacement.
+-- @param {string} str Text in which to perform find and replace
+-- @param {string} find Text to find (plain text; not a Lua pattern)
+-- @param {string} replace Replacement text (plain text; not a Lua pattern)
+-- @returns {string} Copy of the input `str` with `find` replaced by `replace`
+---
+local function gsub_plain(str, find, replace)
+    return string.gsub(str, escape_gsub_find_arg(find), escape_gsub_replace_arg(replace))
 end
 
 -- Extracts only the folder name from the input Path
@@ -153,7 +179,7 @@ local function set_prompt_filter()
     end
 
     if prompt_useHomeSymbol and string.find(cwd, clink.get_env("HOME")) then
-        cwd = string.gsub(cwd, clink.get_env("HOME"), prompt_homeSymbol)
+        cwd = gsub_plain(cwd, clink.get_env("HOME"), prompt_homeSymbol)
     end
 
     local uah = ''
@@ -176,14 +202,14 @@ local function set_prompt_filter()
     local version_control = prompt_includeVersionControl and "{git}{hg}{svn}" or ""
 
     local prompt = "{uah}{cwd}" .. version_control .. cr .. get_lamb_color() .. "{env}{lamb}\x1b[0m "
-    prompt = string.gsub(prompt, "{uah}", uah)
-    prompt = string.gsub(prompt, "{cwd}", cwd)
-    prompt = string.gsub(prompt, "{env}", env)
-    clink.prompt.value = string.gsub(prompt, "{lamb}", prompt_lambSymbol)
+    prompt = gsub_plain(prompt, "{uah}", uah)
+    prompt = gsub_plain(prompt, "{cwd}", cwd)
+    prompt = gsub_plain(prompt, "{env}", env)
+    clink.prompt.value = gsub_plain(prompt, "{lamb}", prompt_lambSymbol)
 end
 
 local function percent_prompt_filter()
-    clink.prompt.value = string.gsub(clink.prompt.value, "{percent}", "%%")
+    clink.prompt.value = gsub_plain(clink.prompt.value, "{percent}", "%")
 end
 
 ---
@@ -532,13 +558,13 @@ local function git_prompt_filter()
                 color = colors.conflict
             end
 
-            clink.prompt.value = string.gsub(clink.prompt.value, "{git}", " "..color.."("..verbatim(branch)..")")
+            clink.prompt.value = gsub_plain(clink.prompt.value, "{git}", " "..color.."("..branch..")")
             return false
         end
     end
 
     -- No git present or not in git file
-    clink.prompt.value = string.gsub(clink.prompt.value, "{git}", "")
+    clink.prompt.value = gsub_plain(clink.prompt.value, "{git}", "")
     return false
 end
 
@@ -577,13 +603,13 @@ local function hg_prompt_filter()
             end
 
             local result = color .. "(" .. branch .. ")"
-            clink.prompt.value = string.gsub(clink.prompt.value, "{hg}", " "..verbatim(result))
+            clink.prompt.value = gsub_plain(clink.prompt.value, "{hg}", " "..result)
             return false
         end
     end
 
     -- No hg present or not in hg repo
-    clink.prompt.value = string.gsub(clink.prompt.value, "{hg}", "")
+    clink.prompt.value = gsub_plain(clink.prompt.value, "{hg}", "")
 end
 
 local function svn_prompt_filter()
@@ -636,13 +662,13 @@ local function svn_prompt_filter()
                 color = colors.dirty
             end
 
-            clink.prompt.value = string.gsub(clink.prompt.value, "{svn}", " "..color.."("..verbatim(branch)..")")
+            clink.prompt.value = gsub_plain(clink.prompt.value, "{svn}", " "..color.."("..branch..")")
             return false
         end
     end
 
     -- No svn present or not in svn file
-    clink.prompt.value = string.gsub(clink.prompt.value, "{svn}", "")
+    clink.prompt.value = gsub_plain(clink.prompt.value, "{svn}", "")
     return false
 end